Food — Study Notes for TN TET Paper I (EVS)

Overview

Food is a foundational topic in Environmental Studies for Paper I, targeting teachers of classes 1–5. Questions typically test your understanding of food sources, basic nutrition concepts, what constitutes a balanced diet for children, and traditional as well as modern methods of food preservation. This topic connects directly to real-life experiences of children, making it pedagogically important for primary classrooms.

Expect 2–4 questions from this area, often framed around practical scenarios—identifying food groups, explaining why certain foods are necessary for growth, or recognising preservation methods. Mastery here requires knowing classifications clearly, understanding the role of each nutrient, and being able to relate food habits to health outcomes in children.

Key Concepts

• **Food sources are categorised as plant-based and animal-based.** Plants give us cereals, pulses, fruits, vegetables, oils and spices. Animals provide milk, eggs, meat, fish and honey.

• **Nutrients are chemical substances in food that the body needs.** The six main nutrients are carbohydrates, proteins, fats, vitamins, minerals and water—each serving a distinct function.

• **Carbohydrates and fats are energy-giving foods.** They fuel daily activities and body functions. Rice, wheat, sugar, oils and ghee are primary sources.

• **Proteins are body-building foods.** Essential for growth and repair of tissues. Pulses (dal), milk, eggs, fish and meat are rich protein sources.

• **Vitamins and minerals are protective foods.** They regulate body processes and prevent deficiency diseases. Fruits and vegetables are the main sources.

• **A balanced diet contains all nutrients in correct proportions.** It varies by age, gender, activity level and physiological condition (growth, pregnancy).

• **Food preservation prevents spoilage and extends shelf life.** Methods include drying, refrigeration, salting, pickling, canning, pasteurisation and use of preservatives.

• **Food habits are influenced by region, culture, religion, climate and availability.** Tamil Nadu's food culture emphasises rice, sambar, rasam, coconut and fermented foods like idli and dosa.

Formulas / Key Facts

| Nutrient | Function | Key Sources | Deficiency Disease | |----------|----------|-------------|-------------------| | Carbohydrates | Energy | Rice, wheat, potato, sugar | Weakness, fatigue | | Proteins | Growth and repair | Dal, milk, eggs, fish, soybean | Kwashiorkor, Marasmus | | Fats | Energy, insulation | Oil, ghee, butter, nuts | Poor growth, dry skin | | Vitamin A | Vision, skin health | Carrot, papaya, milk, liver | Night blindness | | Vitamin B complex | Metabolism, nerves | Whole grains, meat, eggs | Beriberi, pellagra | | Vitamin C | Immunity, wound healing | Citrus fruits, amla, guava | Scurvy | | Vitamin D | Bone health, calcium absorption | Sunlight, fish, egg yolk | Rickets (children), Osteomalacia | | Calcium | Bones and teeth | Milk, ragi, green leafy vegetables | Weak bones, tooth decay | | Iron | Haemoglobin formation | Spinach, jaggery, dates, meat | Anaemia | | Iodine | Thyroid function | Iodised salt, seafood | Goitre | | Water | Transport, temperature regulation | Liquids, fruits, vegetables | Dehydration |