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Photosynthesis in Higher Plants

ICSE · Class 11 · Biology

Quick revision notes for Photosynthesis in Higher Plants — ICSE Class 11 Biology. Key concepts, formulas, and definitions for last-minute revision.

60 questions54 flashcards5 concepts

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A detailed, labeled cross-section diagram of a chloroplast, showing its double membrane, stroma, thylakoids, grana (stacks of thylakoids), and stroma lamellae, highlighting the sites of light and dark
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Key Topics to Revise

1

1. Landmarks in the Study of Photosynthesis

  • Aristotle and Theophrastus believed plants absorb all materials directly from the soil.
  • Van Helmont grew a willow seedling in weighed soil for five years and concluded that water contributes to plant growth.
  • Stephen Hales recognised the importance of air and light in plant nutrition.
2

2. Chloroplast: Site of Photosynthesis

  • The entire photosynthetic machinery lies in the chloroplast, the green plastid.
  • In higher plants, chloroplasts are disc-shaped, 4-10 µm long and 1-3 µm broad.
  • There are usually 20-40 chloroplasts per cell in higher plants.
3

3. Pigments Involved in Photosynthesis

  • Chlorophylls and carotenoids are the two major groups of pigments in higher plants.
  • Pigments absorb certain wavelengths of visible light.
  • Chlorophyll a is the primary photosynthetic pigment.
4

4. Nature of Light, Absorption Spectrum, and Action Spectrum

  • Visible light lies between 390 nm and 763 nm.
  • Blue light carries more energy per photon than red light because photon energy is inversely proportional to wavelength.
  • A pigment molecule absorbs only one photon at a time.

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Full Notes

Key Concepts

Photosynthesis is the light energy trappingChloroplasts are discChlorophyll a is the primary photosyntheticAbsorption spectrum shows the wavelengthsThe light reaction includes excitation

Frequently Asked Questions

What are the important topics in Photosynthesis in Higher Plants for ICSE Class 11 Biology?
Photosynthesis in Higher Plants covers several key topics that are frequently asked in ICSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Photosynthesis in Higher Plants — ICSE Class 11 Biology?
Understand the core concepts first, then work through the 60 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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