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Photosynthesis

ICSE · Class 10 · Biology

Quick revision notes for Photosynthesis — ICSE Class 10 Biology. Key concepts, formulas, and definitions for last-minute revision.

42 questions35 flashcards5 concepts

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A labeled diagram of a dicot stomatal apparatus, showing the bean-shaped guard cells, the stomatal pore, and the surrounding subsidiary cells and epidermal cells.
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Key Topics to Revise

1

1. Basic idea and overall equation

  • Photosynthesis is the process by which green plants make glucose from carbon dioxide and water in the presence of sunlight and chlorophyll.
  • Leaves are the photosynthetic organ of the plant.
  • The overall equation is: 6 CO2 + 12 H2O --Sunlight, Chlorophyll--> C6H12O6 + 6 H2O + 6 O2 ↑
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2. Structure of the leaf and chloroplast

  • Leaves are flat and thin, so they absorb maximum light and allow short diffusion distance for carbon dioxide.
  • Leaves have an extensive network of veins that transport water and food materials.
  • Stomata present on leaves help in gaseous exchange.
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3. Photosynthetic pigments

  • Chlorophyll is the most important photosynthetic pigment.
  • Chlorophyll has a magnesium-containing head and a tail of phytol, which is a type of alcohol.
  • Chlorophyll exists in forms a, b, c, d, e, and bacteriochlorophyll.
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4. Stomata and opening and closing mechanism

  • Stomata are openings in the leaf epidermis for gas exchange.
  • Each stoma has two kidney-shaped guard cells.
  • Guard cells have thick inner cell walls and chloroplasts.

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Full Notes

Key Concepts

Photosynthesis is the process byLeaves are the main organsChloroplasts are biconvex discChlorophyll is the most important photosyntheticStomata are openings controlled by two

Frequently Asked Questions

What are the important topics in Photosynthesis for ICSE Class 10 Biology?
Key topics in Photosynthesis include Mechanism of Photosynthesis: Light and Dark Reactions, Mechanism of Photosynthesis: Light and Dark Reactions, Light Reaction vs Dark Reaction — What Happens Where. These are the concepts ICSE Class 10 examiners draw on most — study them first, then practise related questions.
How to score full marks in Photosynthesis — ICSE Class 10 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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