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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.

44 questions22 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

Basic Concepts of Nutrition

  • Nutrition is the supply of essential organic and inorganic compounds (nutrients) to the body
  • Food is any substance we eat or drink containing nutrients (milk, bread, egg, fish, apple)
  • Diet is the combination of food items in our meals; balanced diet provides all necessary nutrients
2

Carbohydrates

  • Composed of carbon, hydrogen, and oxygen in ratio C:H:O with H:O always 2:1
  • Principal energy sources - 1 mole glucose releases 686 kilocalories
  • Two main types: Sugars (soluble, sweet) and Starch (insoluble)
3

Fats

  • Composed of carbon, hydrogen, oxygen with less oxygen than carbohydrates
  • Produce more energy than carbohydrates - 9.45 Kcal per mole
  • Made up of fatty acids and glycerol
4

Proteins

  • Large molecules containing C, H, O, N (nitrogen most essential element)
  • May also contain sulfur and phosphorus
  • Made up of amino acids as building blocks

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Full Notes

Key Concepts

Nutrition is the supply of essentialLiving organisms need foodCarbonLarge molecules containing carbonComposed of carbon

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?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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