Nutrition
ICSE · Class 9 · Biology
Flashcards for Nutrition — ICSE Class 9 Biology. Quick Q&A cards covering key concepts, definitions, and formulas.
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Explore the full setWhat is nutrition? How is it different from food?
Answer
Nutrition is the supply of essential organic and inorganic chemical compounds (proteins, vitamins, salts, etc.) to the body. These compounds are called nutrients. Food is any substance we eat or drink…
List the six main purposes for which living organisms require food.
Answer
1. Growth - Building new protoplasm or cells 2. Repair - Providing material for repair of worn-out cells 3. Energy - Providing energy for life functions 4. Maintenance - Maintaining chemical compositi…
Name the six classes of nutrients and give one example of each.
Answer
1. Carbohydrates - glucose, starch 2. Fats - butter, vegetable oil 3. Proteins - egg, meat, pulses 4. Mineral salts - calcium, iron, iodine 5. Vitamins - Vitamin A, Vitamin C 6. Water - drinking water…
What are monosaccharides? Name three types with examples.
Answer
Monosaccharides are single (simple) sugars with chemical formula C₆H₁₂O₆. They need no digestion and are directly absorbed. Three types: 1. Glucose - grape sugar, blood sugar 2. Fructose - fruit sugar…
What are disaccharides? Name three types and their composition.
Answer
Disaccharides are double sugars with formula C₁₂H₂₂O₁₁. They require digestion: 1. Sucrose - made of glucose + fructose (cane sugar) 2. Maltose - made of two glucose molecules (malt sugar) 3. Lactose …
What is roughage? List its three main roles in our body.
Answer
Roughage is undigested cellulose from plant cell walls that acts as fiber. Three main roles: 1. Absorbs water and keeps fecal matter soft, preventing constipation 2. Makes movement of undigested food …
Compare the energy production of carbohydrates and fats. List four functions of fats.
Answer
Energy comparison: Fats produce more energy than carbohydrates - 1 mole of fat releases 9.45 Kcal vs carbohydrates. Four functions of fats: 1. Produces energy like carbohydrates 2. Important storage …
What makes proteins unique among nutrients? What are amino acids?
Answer
Proteins are unique because they contain nitrogen, which is the most essential element in proteins (along with carbon, hydrogen, oxygen). Some also contain sulfur and phosphorus. Amino acids are the s…
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