৪৯তম বিসিএস ⎯ গার্হস্থ্য অর্থনীতি [৩৯১]

The famous novel, The Bluest Eye, is written by - American author.

• The Bluest Eye:
- এটি Toni Morrison রচিত।
- এটি একটি novel.
- এটি ১৯৭০ সালে প্রকাশিত হয়।

• Toni Morrison ছিলেন একজন আমেরিকান Novelist, essayist এবং Editor.
- তাছাড়া তিনি Princeton University এর প্রফেসর ছিলেন।

তাঁর উল্লেখযোগ্য সাহিত্যকর্ম গুলো -
- Beloved,
- Song of Solomon,
- The Bluest Eye.

Source: Britannica.

বাংলাদেশের তত্ত্বাবধায়ক সরকার:
- বাংলাদেশের তত্ত্বাবধায়ক সরকার বাংলাদেশের একপ্রকারের শাসন ব্যবস্থা, যার অধীনে দুইটি নির্বাচিত সরকারের মধ্যবর্তী সময়কালে সাময়িকভাবে অনির্বাচিত ব্যক্তিবর্গ কোন দেশের শাসনভার গ্রহণ করে থাকে।
- বিএনপি সরকারের পদত্যাগের পর ১৯৯৬ সালে ত্রয়োদশ সংশোধনের মাধ্যমে সংবিধানে যোগ হয় তত্ত্বাবধায়ক সরকার পদ্ধতি।
- এই সংশোধনীর মাধ্যমে ১৯৯৬ সালে সাংবিধানিকভাবে তত্ত্বাবধায়ক সরকার ব্যবস্থা চালু হয়।
- বিচারপতি মুহাম্মদ হাবিবুর রহমান ছিলেন সেই তত্ত্বাবধায়ক সরকারের প্রধান উপদেষ্টা।
- উপদেষ্টা পরিষদের বাকিরা হলেন: ব্যারিস্টার সৈয়দ ইশতিয়াক আহমেদ, ড. মুহাম্মদ ইউনূস, অর্থনীতিবিদ ড. ওয়াহিদউদ্দিন মাহমুদ, অধ্যাপক মো. শামসুল হক, অধ্যাপক জামিলুর রেজা চৌধুরী, শেগুফতা বখত চৌধুরী, এ জেড এম নাছিরুদ্দিন, সৈয়দ মঞ্জুর এলাহী, অধ্যাপক নাজমা চৌধুরী ও মেজর জেনারেল (অব.) আব্দুর রহমান খান।
- এই তত্ত্বাবধায়ক সরকার মোট ৮৬ দিন ক্ষমতায় ছিল। এই সরকার ১৯৯৬ সালের ১২ জুন জাতীয় সংসদের নির্বাচনের তারিখ ঘোষণা করেন।
- অবশেষে বিপুল উৎসাহ ও উদ্দীপনা মধ্য দিয়ে ১৯৯৬ সালের ১২ জুন তত্ত্বাবধায়ক সরকারের অধীন প্রথম সপ্তম জাতীয় সংসদ নির্বাচন অনুষ্ঠিত হয়।

উল্লেখ্য,
- ১৯৯০ সালে সেনাশাসক হুসেইন মুহম্মদ এরশাদের পতনের পর জাতীয় নির্বাচন আয়োজন পর্যন্ত দায়িত্ব পালনের জন্য গঠন করা হয়েছিল নির্দলীয় প্রথম অন্তর্বর্তীকালীন সরকার।
- প্রধান বিচারপতি শাহাবুদ্দিন আহমেদের নেতৃত্বে ঐ সরকার গঠিত হয়েছিল।

এছাড়াও,
- ৩০ জুন, ২০১১ সালে পঞ্চদশ সংশোধনীর মাধ্যমে বাংলাদেশের সংবিধান থেকে 'তত্ত্বাবধায়ক সরকার ব্যবস্থা' বাতিল করা হয়।

উৎস: ইতিহাস ২য় পত্র, এইচএসসি প্রোগ্রাম, বাংলাদেশ উন্মুক্ত বিশ্ববিদ্যালয়।

OIC:
- ইসলামিক সহযোগিতা সংস্থা OIC.
- OIC এর পূর্ণরূপ The Organisation of Islamic Cooperation.
- ইসরাইল কর্তৃক আল আকসা মসজিদে আগুন ধরিয়ে দেওয়ার প্রেক্ষাপটে OIC গঠিত হয়।
- এটি মুসলিম দেশগুলোর একটি রাজনৈতিক জোট যা রাবাত সম্মেলনের মাধ্যমে গঠিত হয়।
- প্রতিষ্ঠার স্থান: মরক্কো।
- প্রতিষ্ঠিত হয়: ২৫ সেপ্টেম্বর, ১৯৬৯ সালে।
- সদর দপ্তর: জেদ্দা, সৌদি আরব।
- বর্তমান মহাসচিব: হুসাইন ইব্রাহিম তাহা (১২ তম)। (অক্টোবর, ২০২৫)
- মহাসচিবের মেয়াদ: ৫ বছর।
- অফিসিয়াল ভাষা: তিনটি (আরবি, ইংরেজি, ফ্রেঞ্চ)।
- বর্তমান সদস্য: ৫৭টি। (অক্টোবর, ২০২৫)

⇒ দক্ষিণ আমেরিকা অঞ্চলের দুটি দেশ OIC এর সদস্য।
• গায়ানা ও
• সুরিনাম।

- ইউরোপ মহাদেশের আলবেনিয়া OIC এর সদস্য।
- বাংলাদেশ ১৯৭৪ সালের ২২-২৪ ফেব্রুয়ারি পাকিস্তানের লাহোরে অনুষ্ঠিত OIC এর দ্বিতীয় শীর্ষ সম্মেলনে সর্বপ্রথম অংশগ্রহণ করে।

তথ্যসূত্র - OIC অফিসিয়াল ওয়েবসাইট।

কার্টাগেনা প্রটোকল (Cartagena Protocol):
- কার্টাগেনা প্রোটকলের পূর্ণনাম - The Cartagena Protocol on Biosafety to the Convention on Biological Diversity.
- কার্টাগেনা প্রটোকল জৈব-নিরাপত্তা বিষয়ক একটি আন্তর্জাতিক চুক্তি।
- এই চুক্তিটি কলম্বিয়ার কার্টাগেনাতে আলোচিত হয়।
- চুক্তি অনুমোদন - ২৯ জানুয়ারি, ২০০০ সাল।
- চুক্তি কার্যকর - ১১ সেপ্টেম্বর, ২০০৩ সাল।

তথ্যসূত্র - কনভেনশন অন বায়ো-ডাইভার্সিটি (CBD) ওয়েবসাইট।

জাতিসংঘ:
- জাতিসংঘের অর্থনৈতিক ও সামাজিক কমিশন (ECOSOC) এর অধীন ৫টি আঞ্চলিক কমিশন রয়েছে।

⇒ এগুলো হলো:
- এশিয়া ও প্রশান্ত মহাসাগরীয় অর্থনৈতিক ও সামাজিক কমিশন (ESCAP),
- পশ্চিম এশীয় অর্থনৈতিক ও সামাজিক কমিশন (ESCWA),
- ল্যাটিন আমেরিকা ও ক্যারিবীয় অর্থনৈতিক কমিশন (ECLAC),
- ইউরোপিয়ান অর্থনৈতিক কমিশন (ECE),
- আফ্রিকান অর্থনৈতিক কমিশন (ECA).

তথ্যসূত্র - UN ওয়েবসাইট।

ইউরোপীয় ইউনিয়ন (EU):
- বিশ্বের সবচেয়ে বড় অর্থনৈতিক জোট ইউরোপীয় ইউনিয়ন (EU)।
- এর সদর দপ্তর বেলজিয়ামের ব্রাসেলসে অবস্থিত।
- প্রতিষ্ঠাতা সদস্য: ৬টি দেশ।
- বেলজিয়াম, ফ্রান্স, জার্মানি, ইতালি, লুক্সেমবার্গ, নেদারল্যান্ডস।
- বর্তমান সদস্য: ২৭টি দেশ। (অক্টোবর, ২০২৫)
- সর্বশেষ সদস্য: ক্রোয়েশিয়া। (অক্টোবর, ২০২৫)
- সর্বশেষ ত্যাগকারী: ব্রিটেন (৩১ জানুয়ারি, ২০২০)।
- এটি ১৯৯৩ সালের ১ নভেম্বরে মাসট্রিচট চুক্তি স্বাক্ষরের মাধ্যমে প্রতিষ্ঠিত হয়েছিল।
- তখন থেকে এটি বিশ্বের বৃহত্তম ট্রেডিং ব্লকে পরিণত হয়।

তথ্যসূত্র - EU ওয়েবসাইট।

‘অপারেশন রাইজিং লায়ন':
- ইসরায়েল কর্তৃক ইরানে চালানো সামরিক অভিযানটির নাম 'অপারেশন রাইজিং লায়ন'।
- 'রাইজিং লায়ন' নামটি বাইবেলের একটি অনুচ্ছেদে সিংহের প্রতীকী পরাক্রমকে তুলে ধরে, ইসরায়েলের যুদ্ধ প্রস্তুতি এবং আত্মবিশ্বাসের প্রতীক।
- ১৩ জুন ২০২৫-এর ভোরে ইসরায়েলি বিমান বাহিনী ও গোয়েন্দা সংস্থা মোসাদ যৌথভাবে 'অপারেশন রাইজিং লায়ন' পরিচালনা করে।
- ইসরায়েল প্রথমে 'ড্রোন' দ্বারা ইরানের আকাশ প্রতিরক্ষা ব্যবস্থা দুর্বল করা, এরপর প্রধান পারমাণবিক ও সামরিক লক্ষ্যবস্তুতে বিমান হামলা করে।

উল্লেখ্য:
- এই হামলার জবাবে ইরান পাল্টা হামলা চালায়।
- এই হামলার নাম দেয়া হয় 'অপারেশন টু প্রমিজ থ্রি’।
- ইরান পাল্টা জবাবে শতাধিক ক্ষেপণাস্ত্র ও ড্রোন ছুড়ে।

তথ্যসূত্র - পত্রিকার রিপোর্ট।

IUCN:
- বিশ্ব জীববৈচিত্র্য সংরক্ষণবাদী সংস্থা (IUCN)।
- IUCN এর পূর্ণরূপ - International Union for the Conservation of Nature.
- প্রতিষ্ঠিত হয়: ১৯৪৮ সালে।
- সদর দপ্তর: গ্লান্ড, সুইজারল্যান্ড।
- এটি নিয়ে বিশ্বের ১৭০ টির অধিক দেশ কাজ করছে।
- উদ্দেশ্য: বিশ্বব্যাপী প্রাকৃতিক সম্পদ সংরক্ষণ করা।

তথ্যসূত্র - IUCN অফিসিয়াল ওয়েবসাইট।

IMF:
- IMF এর পূর্ণরূপ The International Monetary Fund.
- এটি আন্তর্জাতিক মুদ্রা তহবিল।
- প্রতিষ্ঠিত হয়: ১৯৪৪ সাল।
- সদর দপ্তর: ওয়াশিংটন ডিসি, যুক্তরাষ্ট্র।
- প্রতিষ্ঠাতা সদস্য: ৪৪টি।
- বর্তমান সদস্য: ১৯১টি। (অক্টোবর, ২০২৫)
- সর্বশেষ সদস্য: লিচেনস্টাইন। (অক্টোবর, ২০২৫)
- বর্তমান ব্যবস্থাপনা পরিচালক: ক্রিস্টালিনা জর্জিয়েভা। (অক্টোবর, ২০২৫)
- বাংলাদেশ সদস্যপদ লাভ করে: ১৯৭২ সালে।

তথ্যসূত্র - IMF অফিসিয়াল ওয়েবসাইট।

প্রশ্ন: P হচ্ছে Q এর পিতা কিন্তু Q, P এর ছেলে নয়। তাদের সম্পর্কটা কোন ধরনের?

সমাধান:
যেহেতু, P হচ্ছে Q এর পিতা কিন্তু Q, P এর ছেলে নয় সুতরাং Q হলো মেয়ে এবং P হচ্ছে পিতা।

সুতরাং, তাদের সম্পর্কটা মেয়ে-পিতা।

প্রশ্ন: নিচের চিত্রে কয়টি ত্রিভুজ আছে?

সমাধান:

একটি করে ফাঁকা ঘর নিয়ে ত্রিভুজ আছে - 1, 2, 3, 4, 5, 6, 7, 8 = ৮ টি
দুইটি করে ফাঁকা ঘর নিয়ে ত্রিভুজ আছে - 12, 34, 56, 78, 67, 58 = ৬ টি
চারটি করে ফাঁকা ঘর নিয়ে ত্রিভুজ আছে - 1267, 3456 = ২টি
সবগুলো ফাঁকা ঘর নিয়ে ত্রিভুজ আছে - 12345678 = ১ টি

সুতরাং, মোট ত্রিভুজ আছে = ৮ + ৬ + ২ + ১ = ১৭ টি

প্রশ্ন: একটি পানি ভর্তি বালতির ওজন ১৪ কেজি। বালতিটি অর্ধেক পানি পূর্ণ থাকলে তার ওজন হয় ৮ কেজি। খালি বালতির ওজন কত?

সমাধান:
দেওয়া আছে,
পানি ভর্তি বালতির ওজন = ১৪ কেজি
অর্ধেক পানি ভর্তি বালতির ওজন = ৮ কেজি
​
​অর্ধেক বালতি পানির ওজন = (১৪ - ৮) কেজি = ৬ কেজি
∴ ​পূর্ণ বালতি পানির ওজন = (৬ × ২) কেজি = ১২ কেজি
​
​আবার,
​পূর্ণ বালতি পানির ওজন + খালি বালতির ওজন = ১৪ কেজি
⇒ ​খালি বালতির ওজন = ১৪ - ​পূর্ণ বালতি পানির ওজন
​⇒ ​খালি বালতির ওজন = ১৪ - ১২ = ২ কেজি

প্রশ্ন: যদি ORANGE = SVERKI হয় তবে GRAPES = ?

সমাধান:
​যদি ORANGE = SVERKI হয় তবে GRAPES = KVETIW
​
​ORANGE শব্দটির বর্ণগুলো থেকে 4 ধাপ এগিয়ে পাওয়া যায়,
O(15) + 4 → S(19)
​R(18) + 4 → V(22)
​A(1) + 4 → E(5)
​N(14) + 4 → R(18)
​G(7) + 4 → K(11)
​E(5) + 4 → I(9)

​অনুরূপভাবে,
GRAPES শব্দটির বর্ণগুলো থেকে 4 ধাপ এগিয়ে গেলে KVETIW শব্দটি পাওয়া যায়। অর্থাৎ,
​G(7) + 4 → K(11)
​R(18) +4 → V(24)
​A(1) + 4 → E(5)
​P(16) + 4 → T(20)
​E(5) + 4 → I(9)
​S(19) + 4 → W(23)
​
অর্থাৎ নির্ণেয় শব্দটি হবে KVETIW

প্রশ্ন: যদি 7 + 3 = 410, 3 + 2 = 15, 6 + 5 = 111 হয়, তবে 8 + 4 = ?

সমাধান:
এখানে
7 + 3 = 410 ⇒ 7 - 3 = 4, 7 + 3 = 10
3 + 2 = 15 ⇒ 3 - 2 = 1, 3 + 2 = 5
6 + 5 = 111 ⇒ 6 - 5 = 1, 6 + 5 = 11

একইভাবে,
8 - 4 = 4, 8 + 4 = 12
সুতরাং, 8 + 4 = 412

প্রশ্ন: A দক্ষিণ দিকে মুখ করে ৪ কি. মি. হাঁটার পর বামদিকে ঘুরল এবং ৫ কি. মি. হাঁটল। আবার ডানদিকে ঘুরে ৮ কি. মি. হাঁটল। এখন যাত্রার স্থান থেকে সরাসরি দূরত্ব কত?

সমাধান:
প্রদত্ত তথ্যগুলোকে চিত্রের মাধ্যমে সাজিয়ে পাই,

এখন, উত্তর-দক্ষিণ দিকে- শুরুতে ৪ কি.মি. দক্ষিণ + পরে আরও ৮ কি.মি. দক্ষিণ = মোট ১২ কি.মি. দক্ষিণ
পূর্ব-পশ্চিম দিকে: শুধু পূর্ব দিকে ৫ কি.মি.

∴ সরাসরি দূরত্ব = √(১২^২ + ৫^২) = √(১৪৪ + ২৫)
= √১৬৯
= ১৩ কি.মি.

প্রশ্ন: (A) চিত্রটির আয়নায় প্রতিবিম্ব কেমন হবে?

সমাধান:


সুতরাং, সঠিক উত্তর (2) নং

Home Management aims to organize family resources and activities efficiently. Its goal is not just saving money, but to promote family and social welfare. Proper home management ensures success, comfort, and prosperity in life.

Home Management has several components:
Planning: Predict future activities.
Organizing: Allocate resources and responsibilities.
Controlling: Monitor activities to ensure progress.
Evaluation: Review outcomes to improve efficiency.

Home Management organizes time, money, energy, and skills to run the household efficiently. By planning chores, delegating tasks, and coordinating schedules, it reduces conflicts, saves resources, and creates harmony. Families can enjoy comfort, efficiency, and better quality of life, as work and household duties are balanced.

Example: Planning meals and children’s school routines together ensures less stress and a smoother daily life.

Working women often struggle to balance home and professional responsibilities.
Home Management provides guidelines and planning tools that allow women to manage household duties efficiently, ensuring smooth family life while maintaining professional commitments.
This reduces family stress and ensures effective use of time and resources.

Broderick’s Emphasis:Maintaining ideals and discipline: Ensures family members follow rules, routines, and shared values, creating order and harmony.
Providing goods for survival: Guarantees basic needs like food, clothing, and shelter are met efficiently.
These two aspects are essential for smooth household management, as they balance moral guidance with practical needs, reducing conflicts and ensuring family well-being.

Values are customary standards and attitudes that guide behavior. They include beliefs, traditions, and social norms that influence daily actions and decisions. Values provide direction and meaning in life.

Values:Values are desirable and satisfying principles that guide behavior.
Purpose: They direct individuals toward what is beneficial, rewarding, and morally right.
Effect: Values help maintain stability and consistency in personal choices and social interactions.
Example: Honesty as a value encourages truthful behavior, fostering trust in relationships.

Social values emerge through interaction and social experience. Examples include love, empathy, and sacrifice for others’ welfare.

According to Edwar, a goal is the desired state of existence that a person aims to achieve. It represents an intended outcome in the future, providing direction for actions and decisions.

Long-Term Goals:Enduring objectives that provide direction for planning and help achieve intermediate or short-term goals.
Characteristics: Require consistent effort, patience, and time to accomplish.
Example: Becoming a doctor is a long-term goal, guiding a student’s daily study habits, exams, and career decisions over several years.

Immediate / Short-Term Goals:Small, achievable steps that support long-term goals.
Characteristics: Quick to achieve, measurable, and provide motivation.
Example: Attending school regularly is a short-term goal that helps a student progress toward the long-term goal of becoming educated or achieving a career.

According to Maloch & Ruth E. Deacon, quality refers to the degree and characteristics of resource use in fulfilling life’s demands.
Meaning: It measures how well a product, service, or action meets the intended purpose, combining both quantity and attributes.
Example: A well-stitched garment not only has the correct size (quantity) but also durability and neat finishing (quality).

Conventional Standards (প্রচলিত মান):
Standards that arise from social and cultural norms.
Characteristics:
Stable and relatively unchanging
Guide behavior in familiar social contexts
Provide a framework for acceptable actions and decisions
Example: Greeting elders respectfully or following traditional dress codes reflects conventional standards.

Qualitative Measures (গুণগত মান): Focus on qualities or characteristics rather than numerical values.
Purpose: Assess the nature, effectiveness, or desirability of something.
Example:
Judging household work as well-done or poorly done
Evaluating behavior as good or bad

Task Division According to Skills (কার্য ভাগ অনুযায়ী দক্ষতা):Assigning household tasks to family members based on their abilities and skills.
Benefits:
Improves Efficiency: Tasks are done faster and better.
Reduces Stress: Members are not overloaded with work beyond their capability.
Ensures Participation: Everyone contributes meaningfully to household management.

Fayol’s Discipline Principle:
Discipline is one of Henri Fayol’s 14 principles of management. It emphasizes:Good supervision – proper oversight of work.
Respect for agreements – following organizational rules and contracts.
Appropriate penalties – fair application of consequences for rule violations.
What is NOT included:
Increasing personal conflicts or disagreements – creating tension among members is not part of discipline.

Fayol’s Principle: Unity of Effort
Meaning: When all members of a group work together toward a common goal, the results are more efficient and effective.
Key Idea: Teamwork multiplies results; collective effort is better than isolated work.
Example: In household management, if all family members cooperate in cooking, cleaning, and budgeting, the tasks are completed faster and more smoothly than if each works separately.

Planning is the first step in Home Management. It involves setting goals, anticipating resources, scheduling activities, and laying the foundation for organization, control, and evaluation.

Authority and Responsibility (কর্তৃত্ব ও দায়িত্ব)
Definition: Authority (right to give orders) must match responsibility (accountability).
Home Application: Assign capable family members responsibility with clear authority.
Example: Son goes shopping with a 500-taka budget and a list; if he exceeds, teach next time. Accountability ensures cost control.

Discipline (শৃঙ্খলা)
Definition: Following rules and supervision maintain order.
Home Application: Apply household rules (e.g., mealtimes) to ensure harmony.
Example: TV off after 10 PM; if violated, limit privileges, reward good behavior. Healthy routine maintained.

Unity of Command (নির্দেশনার ঐক্য)
Definition: Each member follows one authority to avoid confusion.
Home Application: Family members obey the home manager (usually mother).
Example: Children follow mother’s study schedule; father coordinates to avoid conflicts.

American anthropologist Clyde Kluckhohn defined values as the relationship between attitudes, motivations, and customary practices or traditions.
Attitudes (মনোভাব): Our feelings or mindset toward things, e.g., respecting elders.
Motivations (প্রেরণা): The drive behind our actions, e.g., helping family members.
Customs & Practices (প্রথা ও রীতি): Established social behaviors, e.g., celebrating festivals or following table manners

Nickel & Dorsey divided goals into three types:

Long-term goals (দীর্ঘমেয়াদি লক্ষ্য):

Goals that take a long time to achieve and guide overall planning.
Example (উদাহরণ): Becoming a doctor or saving for a house.
Intermediate goals (মধ্যবর্তীকালীন লক্ষ্য):

Goals that act as steps toward long-term objectives.
Example (উদাহরণ): Completing medical school or saving a portion of income monthly.
Immediate or short-term goals (তাৎক্ষণিক লক্ষ্য):

Small, achievable tasks that can be done quickly and contribute to larger goals.
Example (উদাহরণ): Going to school daily, finishing homework on time, or saving ১০% of weekly allowance.

According to Henri Fayol’s ‘Esprit de Corps’ principle, working as a team makes difficult tasks easier.
Example: If a family cleans the house together during the weekend, tasks finish faster, and everyone shares the effort, just like “দশের লাঠি একার বোঝা” "Many a little makes a mickle").

Qualitative measures are assessed subjectively by an individual, based on personal judgment rather than numbers. Therefore, it is also called personal value (ব্যক্তিগত মান).
Example: Evaluating a household chore as “well done” or “needs improvement” depends on personal observation, not numeric measurement.

The human body is about 60–70% water, and water is essential for digestion, circulation, temperature regulation, and removal of waste.
On average, an adult loses water daily through urine, sweat, breathing, and stools.
To replace this, health experts generally recommend about 2 liters (8 glasses) of water daily for an average adult under normal conditions.
However, exact needs vary depending on climate, physical activity, and health status.

Proteins (প্রোটিন) are the body’s building blocks.
They are essential for forming and repairing muscles, skin, bones, enzymes, hormones, and antibodies.
Carbohydrates and fats mainly provide energy, while fiber aids digestion but does not build body structure.

Calcium, Magnesium, and Vitamin D are crucial for bone strength and mineralization.

Calcium → main bone mineral.
Vitamin D → helps calcium absorption.
Magnesium → supports bone density.
Thiamin (Vitamin B1) plays a role in energy metabolism and nerve function, not bone health.

Vitamin C (Ascorbic acid) boosts the immune system, helps in the formation of collagen (a protein in connective tissue, skin, and blood vessels), and aids wound healing.
Deficiency causes scurvy, leading to weak connective tissue, bleeding gums, and poor immunity.

Omega-3 fatty acids (EPA & DHA) are essential fats that support heart health, brain function, and reduce inflammation.
They are mainly found in fatty fish such as sardines, salmon, mackerel, and tuna.
Corn oil & wheat products provide other nutrients but are poor in omega-3.
Pork contains fats, but not significant omega-3.

Spina Bifida is a serious neural tube defect (NTD) where the spinal cord does not develop properly in the fetus.
Folate (Vitamin B9 / Folic acid) is essential in the first trimester of pregnancy for proper formation of the neural tube, which develops into the brain and spinal cord.
Women of childbearing age are advised to take folic acid supplements before conception and during early pregnancy to reduce the risk.
Other vitamins (D, A, E) are important but do not specifically prevent neural tube defects.

Fats (Lipids) are not only an energy source but also have key structural and functional roles.
They are required to:
Make hormones (like estrogen, testosterone, cortisol).
Maintain healthy skin & hair.
Form cell membranes (phospholipid bilayer).
Help in absorption of fat-soluble vitamins (A, D, E, K).
Carbohydrates → primary energy source, not structural.
Fiber → aids digestion, but doesn’t build membranes or hormones.
Vitamin B12 → essential for red blood cell formation & nervous system, not for skin or membranes.

Fruits & Vegetables → Rich in vitamins (C, A, K, folate, etc.) and minerals (potassium, magnesium, iron, etc.).
Protein → Found more in meat, fish, eggs, legumes, dairy.
Unsaturated fats → Found in nuts, seeds, fish, and plant oils, not in most fruits/vegetables.

A recipe may be simple or complex, cheap or costly, quick or time-consuming — but what really matters in judging its quality is whether it is nutritious and tastes good.The true measure of a recipe is not its complexity, cost, or preparation time, but how well it feeds the body and pleases the palate.

Enzymes are biological molecules that catalyze chemical reactions in the body, meaning they speed up reactions without being consumed.
Chemically, enzymes are made up of long chains of amino acids, which fold into specific 3D structures. This makes them proteins.
Some enzymes may require non-protein helpers called cofactors (like metal ions or vitamins), but the enzyme itself is a protein.
They are not lipids (fats) or vitamins (organic compounds required in small amounts).

Collagen is a protein that provides strength and structure to connective tissues like skin, bones, and blood vessels.
Ascorbic acid (Vitamin C) is essential for collagen synthesis because it helps in the hydroxylation of proline and lysine amino acids in collagen. Without Vitamin C, collagen formation is impaired.
Thiamine (Vitamin B1) is important for energy metabolism.
Retinol (Vitamin A) is needed for vision and epithelial tissue health.
Tocopherol (Vitamin E) acts as an antioxidant protecting cells from damage.

Iron is an essential mineral in the body, mainly involved in oxygen transport as a component of hemoglobin in red blood cells and myoglobin in muscles.
In a normal adult:

Most of the iron (~2.5 g) is in hemoglobin.
A smaller portion is in myoglobin and enzymes.
The rest is stored in the liver, spleen, and bone marrow as ferritin and hemosiderin.
Normal total body iron content: about 3.5–4 grams.
Too little iron can cause iron-deficiency anemia, and too much can lead to hemochromatosis (iron overload).

A balanced diet provides all nutrients in the right proportions to meet the body’s energy and growth needs.
Approximate proportion of energy sources in a balanced diet:

Proteins: ~20% (1/5) → for growth, tissue repair, and enzyme/hormone production.
Fats: ~20% (1/5) → for energy storage, cell membranes, and fat-soluble vitamins (A, D, E, K).
Carbohydrates: ~60% (3/5) → primary energy source for daily activities and brain function.

Fish liver oil (like cod liver oil) is especially rich in fat-soluble vitamins:

Vitamin A (Retinol): Important for vision, skin health, and growth.
Vitamin D: Helps in calcium absorption and bone mineralization, preventing rickets in children and osteomalacia in adults.
It does not contain significant amounts of water-soluble vitamins like B-complex or Vitamin C.
Vitamins K and E are present in other foods (like green leafy vegetables for K, nuts and seeds for E).

Textile: Derived from Latin “Texo”, meaning to weave or construct.
Importance: This highlights the fundamental nature of textiles as woven or constructed materials.

"Fibers can be classified based on their origin (source) into two main categories: 1. Natural Fibers 2. Artificial Fibers.
"Natural Fibers: Obtained directly from plants, animals, or minerals (e.g., cotton, wool, silk, jute).
Artificial Fibers: Man-made from chemical processes using natural raw materials (e.g., rayon, viscose).

Cement mixed with water must be used within 30 minutes. After this time, its strength starts to deteriorate.
Initial setting time: Once cement is mixed with water, it begins to set.
Workability: Cement must be used within 30 minutes to ensure proper bonding and strength.
After 30 minutes: The mixture loses plasticity, and strength starts to deteriorate, making it unsuitable for construction.

Nylon: A man-made fiber, produced from synthetic polymers (polyamides).
Category: Falls under Artificial Fibers → Non-cellulose Polymer Fibers.
Natural Fibers: Include Cotton (plant), Wool (animal), Silk (animal).

Among plant-based fibers, cotton is the most widely used throughout history and is still highly popular today. Its versatility, comfort, and global demand make it the “King of Fibres.”

Vitamin D:Helps regulate calcium and phosphorus levels in the blood, promoting bone mineralization.
Increases intestinal absorption of calcium and mobilizes calcium from bones when needed.
These actions are similar to parathormone (PTH), which also raises blood calcium levels.

Cotton fibers are the soft, fluffy fibers surrounding the seeds inside the cotton boll.
These fibers are spun into yarns and threads to make textiles.
Other parts explained:

Flowers, leaves, and stems do not produce usable cotton fibers.

Pit sand: A coarse, sharp, reddish sand obtained from pits, mainly used for filling land before construction.
Concrete: Usually uses coarse river sand or crushed stone sand.
Plastering: Requires fine sand for a smooth finish.

Prenatal stage: Rapid growth occurs in the womb.
Infancy: Very fast growth—length, weight, and head size increase quickly.
Middle Childhood (approx. 6–12 years): Growth slows down compared to infancy and adolescence.
Adolescence: Growth accelerates again during the adolescent growth spurt due to puberty.

The general-to-specific trend refers to how children first develop broad motor skills and gradually refine them into more precise, controlled movements.
In this case:

The child first uses whole-hand movements to scoop or grab food (general skill).
Later, the child develops fine motor control to manipulate utensils like a fork, spoon, or knife (specific skill).
Other options:

Cephalocaudal: Development from head to feet (e.g., lifting head before crawling).
Discontinuous: Development occurs in stages, not continuous.
Interrelated: Different areas of development influence each other.

Curing of Cement: Cement continues to gain strength over time after setting.
Standard Reference: Cement is considered fully hardened after 28 days under normal curing conditions (adequate water and temperature).

Bast fibers: Obtained from stem or bark of plants.
Examples:

Jute: Commonly used for ropes and sacks.
Flax (Linen): Used for fine textiles.
Hemp: Strong fiber used in ropes, mats, and fabrics.
Cotton is a seed fiber; silk and wool are animal fibers
Nylon, polyester, and rayon are synthetic/artificial fibers.
Kapok and coir are seed and fruit fibers; asbestos is a mineral fibe

Curing: The process of keeping cement concrete or mortar moist for a specific period (usually 7–28 days) so that hydration can continue and the cement gains strength.
Setting: Refers to the stiffening of cement paste (initial hardening), not the full strength.
Seasoning: Mainly used for wood, meaning drying it to remove moisture.
Mixing: The process of combining cement, sand, aggregate, and water.

Animal fibers are obtained from animals or insects. Examples include Wool (from sheep) and Silk (from silkworms).
Vegetable fibers come from plants (e.g., Cotton, Jute, Flax).
Mineral fibers are rare natural fibers (e.g., Asbestos).
Artificial fibers are man-made (e.g., Nylon, Rayon).

Cellulose-based artificial fibers are made by chemically processing natural cellulose (from wood pulp or cotton linters).
Examples: Rayon, Acetate.
Non-cellulose polymer fibers are synthetic fibers made from petrochemicals (e.g., Nylon, Polyester).
Protein fibers are natural (e.g., Wool, Silk) – not artificial.
Metallic fibers are man-made fibers containing metal threads.

Fine sand (সূক্ষ্ম বালি): Best suited for plastering because it provides a smooth finish on walls and ceilings.
Coarse sand (মোটা বালি): Commonly used in concrete work (mixing with cement & aggregate).
Pit sand (পিট বালি): Usually reddish in color, sharp, and used mainly for land filling or sometimes for concrete when washed.
Sylhet sand (সিলেটের বালি): High-quality natural river sand from Sylhet, Bangladesh — generally used in concrete and masonry work, not for plastering.

Carotene (specifically β-carotene) is a precursor of Vitamin A in the body. Vitamin A is essential for vision, skin, and epithelial tissue health.
Deficiency of Vitamin A (or its precursor carotene) leads to:

Xerophthalmia: Dryness of the conjunctiva and cornea.
Nyctalopia (night blindness): Difficulty seeing in low light due to impaired rhodopsin formation in the retina.
Hyperkeratosis: Thickening of the skin and formation of rough, dry patches.
Other options:

Calciferol (Vitamin D): Deficiency causes rickets in children, osteomalacia in adults.
Tocopherol (Vitamin E): Deficiency causes neurological problems and hemolytic anemia.
Naphthoquinone (Vitamin K): Deficiency causes bleeding disorders.

Metallic Fibers (ধাতব তন্তু): These are artificial fibers made from purified metals such as aluminum, silver, and gold. They are often used for decorative textiles, special fabrics, and industrial purposes.
Glass Fiber (গ্লাস ফাইবার): Made from molten glass, used in insulation and composites, not from metals.
Rubber Fiber (রাবার ফাইবার): Made from synthetic or natural rubber, used for elasticity.
Protein Fiber (প্রোটিন ফাইবার): Natural fibers from animals (like wool, silk), not artificial.

Hypokalemia is a condition where the potassium (K⁺) level in the blood is too low.
Potassium is crucial for:

Proper muscle contraction
Nerve impulse transmission
Heart rhythm regulation
When potassium is low, it mainly affects the cardiovascular system, leading to:

Arrhythmias (irregular heartbeats)
Weak pulse
Severe cases can cause cardiac arrest
It can also slightly affect muscles, including digestive muscles, but the most critical system affected is the heart (cardiovascular system).

Filament fibers (ফিলামেন্ট তন্তু): Very long continuous fibers (can be 1 meter or more). Example: Silk (natural filament), and most synthetic fibers (like nylon, polyester) are produced as filaments.
Staple fibers (স্টেপল তন্তু): Short fibers, usually only a few centimeters long. Examples: Cotton, Wool, Jute.
The classification here is explicitly by fiber length, not by color, chemical composition, or origin.

Staple fibers (স্টেপল তন্তু): Short fibers, usually only a few centimeters long. Examples: Cotton, Wool, Jute, Flax.
Filament fibers (ফিলামেন্ট তন্তু): Long, continuous fibers (one meter or more). The only natural filament fiber is Silk.
Hence, all other natural fibers (cotton, wool, flax, etc.) are staple fibers.

The cephalocaudal trend describes how physical and motor development progresses from the head (cephalo) downward (caudal).

Implications in Motor Development:

Neck and Head Control:

Infants can lift and turn their head before they can sit up or grasp objects.
This early control allows for visual tracking and interaction with the environment.
Upper Body Control:

After head and neck, muscles of the shoulders and arms develop strength and coordination.
Babies begin reaching and holding objects.
Lower Body Control:

Leg and foot muscles are controlled later.
Crawling, standing, and walking appear after head, neck, and upper body control are established.

Adolescence is fundamentally a transitional stage marked by significant physical, psychological, and social changes as an individual moves from the dependence of childhood to the independence of adulthood.

Testosterone: The main male sex hormone produced by the testes.
Functions during puberty in boys:
Stimulates growth of penis and testes
Promotes facial and body hair growth
Deepens the voice
Increases muscle mass and strength
Influences mood and sexual development.
Estrogen: Female sex hormone; important for breast development and menstrual cycle.
Progesterone: Female hormone; regulates menstrual cycle and pregnancy.
Insulin: Regulates blood sugar, not puberty changes.

The “Two-Word Stage” (Telegraphic Speech):This is a stage in early language development when children begin combining two words to express a single idea, such as “want cookie” or “go park.”
Age: Typically occurs around 18–24 months of age.
Characteristics:

Children use two-word combinations without unnecessary grammatical words (like “is,” “the,” or “a”).
Speech resembles a telegraph, hence the term telegraphic speech. For example:

“Mommy go” → “Mommy is going”
“More juice” → “I want more juice”
Focuses on content words (nouns and verbs) while omitting smaller function words.

Growth: Refers to quantitative changes, such as height, weight, and body size.
Development: Refers to qualitative changes, such as functional abilities, cognitive skills, and social behavior.
Holistic & Integrative Principle: Both physical (quantitative) and functional/behavioral (qualitative) changes occur together and influence each other, reflecting the comprehensive nature of human development.

Malnutrition (অপুষ্টি) encompasses both under-nutrition (ঘাটতি) and over-nutrition (excessive intake), as both lead to poor health outcomes.

Under-nutrition (ঘাটতি):Insufficient intake of calories, protein, or micronutrients
Can cause stunting, wasting, anemia, and weakened immunity
Over-nutrition (অতিরিক্ত):Excess intake of calories or nutrients
Can cause obesity, diabetes, hypertension, cardiovascular problems

Portland Cement: Named after Portland stone, a type of limestone from Portland quarries in England, due to its similar color and composition.
Key Fact: It was first manufactured by Joseph Aspdin in 1824.

Fiber (আঁশ) adds bulk to stool and helps regulate the digestive system, preventing issues like constipation (কোষ্ঠকাঠিন্য).

Fiber (আঁশ): Indigestible part of plant foods like fruits, vegetables, and whole grains.
Function:

Adds bulk to stool, making it easier to pass.
Helps regulate bowel movements.
Prevents constipation, hemorrhoids, and related digestive issues.

Biotin (Vitamin B7) is a water-soluble vitamin essential for:

Fatty acid synthesis
Amino acid metabolism
Maintaining healthy hair, skin, and nails
Deficiency of biotin can lead to:

Hair thinning or hair loss (alopecia)
Skin rashes, especially around the eyes, nose, and mouth
Brittle nails
Fatigue and mild neurological symptoms in severe cases
Other options explained:

Night blindness: Caused by Vitamin A deficiency
Goiter: Caused by Iodine deficiency
Rickets: Caused by Vitamin D deficiency

1.First Class Brick:
2.All sides — back, sides, top, and bottom — are smooth, and the edges are sharp and straight. These bricks are burnt at
the correct temperature. When struck against each other, they make a ringing sound. If dropped from a height of three feet
onto another brick, they do not break easily. They have no cracks or gaps. When submerged in water, these bricks absorb
less than 15% water.
1.Second Class Brick:
2.These bricks are of lower quality than first class and are burnt at a slightly lower temperature. Their edges and
sides are slightly crooked. When struck against another brick, they do not make a sharp sound. They have cracks.
Their water absorption capacity is more than 20%.
3.Third Class Brick:
4.These bricks are poorly burnt and of low quality. They break easily and do not make sound when struck. When
soaked in water, they become soft and heavy. Their water absorption capacity is more than 25%.
5.Jhama Brick:
6.When bricks are burnt under excessive pressure, they usually become black and porous. These are called
Jhama bricks.
7.Picked Brick:
8.These bricks are burnt more than first-class bricks and are stronger. The edges of picked bricks are uneven and
crooked. They produce a sharp sound and do not break when dropped from a height

Cotton fiber is a vegetable (plant-based) fiber.
Its main chemical component is cellulose, a carbohydrate obtained from plant cell walls.
Protein: Found in animal fibers like wool and silk.
Mineral: Found in mineral fibers like asbestos.
Nylon: A synthetic, man-made polymer fiber.

Cellulose: A carbohydrate and the main component of plant cell walls, including cotton fibers.
It is made of repeating glucose units, each containing 6 carbon, 10 hydrogen, and 5 oxygen atoms, forming a polymer.
H₂O: Water molecule, not a fiber component.
C₁₂H₂₂O₁₁: Formula for sucrose (table sugar).
(CH₂)ₙ: General hydrocarbon chain, not cellulose.

Chromium is an essential trace mineral that plays a key role in carbohydrate and lipid metabolism.
It enhances the action of insulin, a hormone responsible for transporting glucose from the blood into cells.
By improving insulin sensitivity, chromium helps maintain normal blood sugar levels.
Deficiency of chromium can lead to impaired glucose tolerance, higher blood sugar, and in severe cases, symptoms similar to diabetes.

Miscarriage: The natural loss of a pregnancy before the fetus can survive outside the womb.
Premature birth: Birth of a baby before 37 weeks of gestation, which can lead to health problems.
Pregnancy toxemia: A condition during pregnancy characterized by high blood pressure, protein in urine, and other complications.

Macronutrients are nutrients required by the body in large amounts to provide energy and support growth.
The main macronutrients are:

Carbohydrates → primary source of energy.
Proteins → for growth, repair, and body building.
Fats → concentrated energy source and insulation.

Filament fibers are fibers that are very long, sometimes even several meters.
They are usually smooth and shiny, which makes them suitable for fine, glossy fabrics like silk or synthetic filament fibers (nylon, polyester).
Unlike staple fibers, filament fibers do not need much twisting to make yarn, and they can be natural (silk) or artificial (nylon, polyester).

Second Class Bricks:Have minor irregularities in shape (slightly crooked edges).
Water absorption is typically more than 20%, which is higher than first-class bricks.Used for non-load-bearing walls, plastering, or internal partitions.

First Class: Uniform, smooth edges, water absorption < 20%, strong, load-bearing.
Third Class: Poor quality, high water absorption, irregular shape, used for temporary works.

Bamboo is naturally prone to fungal and insect attack, which reduces its durability.
Scientists developed chemical preservatives using boron, chromium, and copper (often referred to as BCC compounds) to enhance bamboo’s resistance and make it long-lasting.
These chemicals penetrate bamboo fibers, protect against termites, decay, and fungi, and extend its service life significantly.

Mineral-based fibers are manufactured using minerals like silica sand, limestone, and other natural minerals.
Example: Glass fiber, which is made by melting silica sand and limestone, then drawing it into fine threads.
Protein-based fibers (like casein fiber) are obtained from proteins.
Cellulose-based fibers (like rayon, acetate) come from plant cellulose.
Rubber fibers are synthetic elastomers, not mineral in origin.

Vitamin A (Retinol) is essential for:

Formation of rhodopsin, a pigment in the retina that helps in low-light vision
Maintaining healthy epithelial tissues (skin, cornea, mucous membranes)
Deficiency of Vitamin A first affects vision in dim light, causing night blindness (রাতকানা).
If deficiency continues:

Xerophthalmia (dryness of the cornea)
Keratomalacia (softening of the cornea)
Permanent blindness in severe cases
Other options:

Cataract: Clouding of the lens, often due to aging
Glaucoma: Increased eye pressure damaging the optic nerve
Conjunctivitis: Inflammation of the conjunctiva, usually due to infection or allergy

Ammonium sulfate and Zinc chloride are commonly used as fire-retardant chemicals for wood.
When wood is soaked in these salts, they form a protective layer inside the fibers that resists ignition and slows down burning.
Creosote oil is used mainly to prevent termite and fungal attacks, not for fire resistance.
Varnish improves appearance and provides some water resistance, but it is flammable.
Water can temporarily soak wood, but once dried, it has no fire resistance.

Sublimation is a healthy defense mechanism where socially unacceptable impulses (like aggression) are transformed into socially acceptable actions (like sports, music, or art), providing a positive outlet.

Seasoning means removing excess moisture from wood before use. This process:Prevents termite and fungal attack.
Reduces chances of warping, cracking, and swelling.
Improves strength and durability.

Traditionally, if wood is expected to touch soil (e.g., posts, beams, fencing):
It is slightly burnt on the surface before use.
This forms a thin charred layer that resists termite, insect, and fungal attacks.
It also increases the durability of wood in damp or soil-contact conditions.

While attachment remains, dependency on family for emotional regulation and security is highest in Early Childhood; peer influence rises sharply in Middle Childhood and Adolescence.

Coir is a natural fiber extracted from the outer husk of coconut fruit.
It is strong, coarse, and durable, used in mats, ropes, brushes, and mattresses.
Seed fibers: e.g., cotton (from cotton seeds)
Bast fibers: e.g., jute, flax (from stem or bark)
Leaf fibers: e.g., pineapple, sisal

Calcium is essential for:
Strong bones and teeth
Muscle contraction
Nerve impulse transmission
Blood clotting
Long-term calcium deficiency weakens bones, making them fragile and prone to fractures, a condition called osteoporosis.
Other effects of calcium deficiency:

Muscle cramps or spasms (less severe than bone effects)
In severe deficiency, poor bone growth in children (rickets)

Physical activity and creative outlets are healthy coping mechanisms. They provide a way to release pent-up energy and emotions, reduce stress hormones, and improve mood.
Physical activity: Exercise helps release pent-up energy, lowers stress hormones (like cortisol), and boosts mood.
Creative outlets: Activities like drawing, music, or writing provide emotional expression and reduce psychological stress.
Other options explained:
Excessive screen time/junk food: Can worsen stress and health.
Avoiding social interaction: Reduces support and increases isolation.
Ignoring feelings: Can lead to emotional buildup and mental health problems.

For binding iron during construction, the standard practice is to use 26 gauge GI (Galvanized Iron) wire.
Why 26 gauge:
Thin enough to easily twist and tie around iron rods.
Strong enough to hold reinforcement securely in place.
16 or 20 gauge: Too thick, hard to bend and tie efficiently.
30 gauge: Too thin, may break easily under stress

The cephalocaudal trend describes how physical and motor development progresses from the head (cephalo) downward (caudal).Infants first gain control of muscles near the head, then progressively gain control of muscles in the trunk, arms, and legs.so,Head and trunk control develops before leg control.

Dry strength: Cotton is moderately strong under normal conditions.
Wet strength: Unlike many other fibers, cotton’s strength increases by about 25% when wet, which makes it durable for washing and daily use.
A: False — cotton does not become weaker when wet.
B: False — there is an actual increase in strength.
D: False — cotton never completely loses its strength in water.

Hyponatremia is a condition where sodium (Na⁺) levels in the blood are abnormally low.
Sodium helps maintain fluid balance between cells and the blood.
When sodium is low, water moves into cells by osmosis, causing them to swell.
The most critical and sensitive organ affected is the brain, because the skull limits expansion, leading to cerebral edema (brain swelling).
Symptoms of brain swelling due to hyponatremia:

Headache
Nausea
Confusion
Seizures
In severe cases, coma or death

Before using iron in construction:
The surface must be clean and free from oil, rust, or any cement coating.
This ensures proper bonding with concrete and prevents corrosion.
Bright polishing is not required.
Bent shape is only needed after binding or fabrication, not before checking.
Perfect smoothness is not necessary; rough surface can even improve bonding with concrete.

Pure iron is too soft and malleable for most construction purposes.
To improve strength, hardness, and durability, small amounts of carbon and other alloying elements are added:

Cast iron: High carbon content, brittle but strong in compression.
Rod iron (wrought iron): Very low carbon content, ductile and tough.
Steel: Moderate carbon content, balances strength and flexibility.

As adolescents seek independence and identity, they turn to their peers for acceptance, validation, and norms. The need to "fit in" with their peer group becomes a powerful motivator for their behavior and choices.
Adolescence: A stage where identity and independence are actively explored.
Peer influence: Teens seek acceptance, social validation, and norms from friends.
Effect: Peer groups strongly influence behavior, clothing, interests, and decision-making.

The rapid hormonal changes of puberty, combined with the ongoing development of the brain's emotional control centers (like the prefrontal cortex), make adolescents more susceptible to intense and rapidly changing emotions.
Puberty hormones (testosterone, estrogen): Cause physical and emotional changes.
Brain development: Emotional regulation centers, like the prefrontal cortex, are still maturing.
Effect: Adolescents experience strong, rapidly changing emotions, heightened sensitivity, and impulsivity.

Proximodistal / নিকটস্থ-দূরবর্তী: Development moves from the center of the body outward to the extremities.
Example: Arm control develops before hand and finger control; shoulder before fingers.

Nylon: A man-made fiber, produced from synthetic polymers (polyamides).
Category: Falls under Artificial Fibers → Non-cellulose Polymer Fibers.
Natural Fibers: Include Cotton (plant), Wool (animal), Silk (animal).
Other options explained:

Regenerated Cellulose Fibers: Made from natural cellulose (e.g., rayon, viscose).
Plant/Animal Fibers: These are naturally obtained, unlike Nylon.

 Coined by psychologist Erik Erikson, "identity versus role confusion" is the key psychosocial stage of adolescence, where teens explore their values, beliefs, and goals to form a coherent sense of who they are.
Identity vs. Role Confusion:
Occurs during adolescence (12–18 years).
Teens explore values, beliefs, and goals.
Goal is to develop a coherent sense of identity.
Failure → role confusion, uncertainty about oneself and the future.

Sodium (Na⁺) is an essential electrolyte that helps regulate:

Fluid balance in the body
Nerve impulses
Muscle function
Sodium deficiency (hyponatremia) can occur due to excessive sweating, diarrhea, vomiting, or low-sodium diet.
Early symptoms of sodium deficiency include:

Headache
Confusion or mental disorientation
Fatigue or weakness
Nausea
If severe, it can lead to seizures, coma, or even death.