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Respiration in Plants

ICSE · Class 9 · Biology

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

41 questions35 flashcards5 concepts

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Key Topics to Revise

1

1. Meaning of Respiration

  • Respiration is a catabolic process of releasing energy from simple sugar glucose for carrying out life processes.
  • It is a breaking down process in which a living cell oxidises organic substances and releases carbon dioxide, water and energy.
  • Energy released in respiration is not only given out as heat; a large part is stored as ATP.
2

2. Steps of Respiration and the Role of ATP

  • The breakdown of glucose to carbon dioxide and water takes place in two major phases.
  • Glycolysis is the first major phase of respiration and occurs in the cytoplasm.
  • Glycolysis converts glucose to pyruvate.
3

3. Aerobic and Anaerobic Respiration

  • Aerobic respiration occurs in the presence of oxygen.
  • Aerobic respiration means complete oxidation of glucose to carbon dioxide and water.
  • Aerobic respiration is also called oxybiotic respiration.
4

4. Respiration in the Whole Plant

  • Every part of a plant respires, including leaves, stem, roots and even the deepest placed cells.
  • Plants obtain oxygen through three inlets: stomata in leaves, lenticels in stem and the general surface of roots.
  • Lenticels are small pores in woody stems that help in gas exchange.

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Full Notes

Key Concepts

Respiration is the breakdown of glucoseGlycolysis is the first major phaseKrebs cycle is the second majorATP is the energyAerobic respiration occurs in the presence

Frequently Asked Questions

What are the important topics in Respiration in Plants for ICSE Class 9 Biology?
Respiration in Plants 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 Respiration in Plants — ICSE Class 9 Biology?
Understand the core concepts first, then work through the 41 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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