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Nutrition

ICSE · Class 9 · Biology

Quick revision notes for Nutrition — ICSE Class 9 Biology. Key concepts, formulas, and definitions for last-minute revision.

42 questions40 flashcards5 concepts

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An infographic illustrating the six main purposes of nutrition for living organisms: growth, repair, energy, maintenance of chemical composition, provision of raw materials for secretions, and protect
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Key Topics to Revise

1

1. Basic ideas: nutrition, food, and diet

  • Nutrition is the supply of essential chemical compounds to the body.
  • Food is any substance eaten or drunk that contains nutrients.
  • Diet is the combination of food items eaten in meals.
2

2. Classes of nutrients

  • The six classes of food substances are carbohydrates, fats, proteins, mineral salts, vitamins, and water.
  • Carbohydrates and fats mainly provide energy.
  • Proteins are needed for growth and repair.
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3. Carbohydrates: sugars, starch, cellulose, and glycogen

  • Carbohydrates are compounds of carbon, hydrogen, and oxygen with hydrogen and oxygen in the ratio 2:1.
  • Monosaccharides are simple sugars and have the general formula C6H12O6.
  • Glucose is the simplest and most common sugar and is called grape-sugar.
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4. Fats, proteins, and energy value

  • Fats contain carbon, hydrogen, and oxygen, but with much less oxygen than carbohydrates.
  • One mole of fat releases 9.45 Kcal of energy, which is more than carbohydrates.
  • Fats store energy and also act as a solvent for fat-soluble vitamins.

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Full Notes

Key Concepts

Nutrition is the supply of essentialCarbohydrates are compounds of carbonGlucoseStarch is an insoluble polysaccharideCellulose is not digested in

Frequently Asked Questions

What are the important topics in Nutrition for ICSE Class 9 Biology?
Nutrition covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Nutrition — ICSE Class 9 Biology?
Understand the core concepts first, then work through the 42 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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