Questions
2 questions per paper
Difficulty
Easy
Importance
High yield for CTET/KVS EVS section
Overview
The study of Food encompasses the biological necessity of nutrients, the chemistry of a balanced diet, and the practical methods of food production and preservation. It is a fundamental segment in teacher eligibility exams like CTET and KVS as it tests core scientific knowledge required to teach primary science. Mastering this topic requires understanding the categorization of nutrients and the technological processes behind shelf-life extension.
Nutrients and Their Functions
Nutrients are categorized into macronutrients and micronutrients based on the quantity required by the human body for physiological function. Understanding the specific deficiency diseases associated with each vitamin and mineral is a recurring theme in state and national level teaching exams.
- Carbohydrates and Fats: Primary energy sources.
- Proteins: Building blocks for growth and repair.
- Vitamin A deficiency: Xerophthalmia or Night Blindness.
- Vitamin C deficiency: Scurvy.
- Iron deficiency: Anaemia.
- Iodine deficiency: Goitre.
Components of a Balanced Diet
A balanced diet contains appropriate proportions of carbohydrates, fats, proteins, vitamins, minerals, and water to maintain optimal health. Candidates must be able to classify food items as energy-giving, body-building, or protective foods.
- Energy-giving foods: Cereals, sugars, and oils.
- Body-building foods: Pulses, milk, eggs, and meat.
- Protective foods: Vegetables and fruits rich in vitamins.
- Roughage: Essential for digestion and bowel movement.
- Water: Constitutes 70% of body weight, regulates temperature.
Food Preservation Techniques
Food preservation involves preventing spoilage caused by microorganisms, insects, or chemical reactions. Exams often test the specific scientific principles behind traditional and modern preservation methods used in households.
- Dehydration: Removal of moisture to inhibit microbial growth.
- Pasteurization: Heating milk to 71.7C for 15s to kill pathogens.
- Salting and Sugaring: Creating high osmotic pressure to draw water from cells.
- Refrigeration: Slows down enzymatic and microbial activity.
- Chemical preservatives: Sodium benzoate and citric acid.
Food Production and Sources
This section covers the origins of food from plant and animal sources and the basic agricultural practices involved in crop production. Aspirants should focus on differentiating between Rabi, Kharif, and Zaid crops.
- Kharif crops: Grown in rainy season (e.g., Rice, Maize).
- Rabi crops: Grown in winter (e.g., Wheat, Gram).
- Animal Husbandry: Rearing animals for food and products.
- Apiculture: Commercial rearing of honey bees.
- Pisciculture: Cultivation of fish in controlled environments.
Exam Tip
Focus on the 'Deficiency Disease Table'—memorizing the correlation between the missing nutrient and its corresponding clinical symptom is the highest-yield activity for this topic.
Common Mistakes
- Confusing the specific deficiency symptoms between Vitamin B complex and Vitamin C.
- Incorrectly identifying Rabi and Kharif crop seasons during exam pressure.
- Overlooking the role of 'roughage' as a non-nutrient component essential for health.
More Revision Notes
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