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Photosynthesis and Respiration

ICSE · Class 7 · Biology

Quick revision notes for Photosynthesis and Respiration — ICSE Class 7 Biology. Key concepts, formulas, and definitions for last-minute revision.

43 questions36 flashcards5 concepts

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Key Topics to Revise

1

Photosynthesis

  • Green plants are autotrophs because they prepare their own food.
  • Photosynthesis is the process by which green plants capture solar energy and use it to convert carbon dioxide and water into simple sugars.
  • Photosynthesis requires water, carbon dioxide, chlorophyll and energy from sunlight.
2

Factors Affecting Photosynthesis

  • The three most important factors affecting photosynthesis are carbon dioxide, light and suitable temperature.
  • These three factors are interdependent and each limits the others.
  • If carbon dioxide is low, photosynthesis becomes slow even if light and temperature are suitable.
3

Experiments Showing Photosynthesis

  • A variegated leaf such as Coleus has white or yellow patches that lack chlorophyll.
  • In the starch test, only the green parts of a variegated leaf turn blue-black.
  • This shows that photosynthesis occurs only in chlorophyll-containing parts.
4

Respiration

  • Respiration is the process in which glucose is broken down to release energy.
  • A large part of the energy released is converted into ATP.
  • Some energy is also released as heat.

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Full Notes

Key Concepts

Photosynthesis is the process byChloroplasts are plastids found in mesophyllStomata are tiny openings mainly onXylem carries water and minerals upwardThe most important factors are carbon

Frequently Asked Questions

What are the important topics in Photosynthesis and Respiration for ICSE Class 7 Biology?
Key topics in Photosynthesis and Respiration include How Photosynthesis Works – Step by Step, Photosynthesis and Respiration Process Flow, Photosynthesis Process: From Inputs to Outputs. These are the concepts ICSE Class 7 examiners draw on most — study them first, then practise related questions.
How to score full marks in Photosynthesis and Respiration — ICSE Class 7 Biology?
Understand the core concepts first, then work through the 43 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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