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Photosynthesis in Higher Plants Flashcards - NEET Biology Class 11 PDF
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Page 1 Photosynthesis in Higher Plants Flash cards Page 2 Photosynthesis in Higher Plants Flash cards Joseph Priestley in 1770 performed a series of experiments that revealed the essential role of air in the growth of green plants. • Page 3 Photosynthesis in Higher Plants Flash cards Joseph Priestley in 1770 performed a series of experiments that revealed the essential role of air in the growth of green plants. • Do you know form where the oxygen evolved during the photosynthesis come from ? Page 4 Photosynthesis in Higher Plants Flash cards Joseph Priestley in 1770 performed a series of experiments that revealed the essential role of air in the growth of green plants. • Do you know form where the oxygen evolved during the photosynthesis come from ? O2 evolved by the green plant comes from H 2 O. • Page 5 Photosynthesis in Higher Plants Flash cards Joseph Priestley in 1770 performed a series of experiments that revealed the essential role of air in the growth of green plants. • Do you know form where the oxygen evolved during the photosynthesis come from ? O2 evolved by the green plant comes from H 2 O. • The Mesophyll cells in the leaves have a large numbers of chloroplasts. • Electron micrograph of a section of chloroplastRead More
FAQs on Flashcards: Photosynthesis in Higher Plants
| 1. What's the difference between light-dependent and light-independent reactions in photosynthesis? |  |
Ans. Light-dependent reactions occur in the thylakoid membrane and require sunlight to produce ATP and NADPH, while light-independent reactions (Calvin cycle) happen in the stroma and use these energy molecules to fix carbon dioxide into glucose. Light-independent reactions can occur without direct light if energy carriers are available, making them functionally distinct despite their interconnection in the overall photosynthetic pathway.
| 2. Why do plants need chlorophyll to carry out photosynthesis in higher plants? | |
Ans. Chlorophyll absorbs light energy across the visible spectrum, particularly blue and red wavelengths, which initiates photosynthesis. Without chlorophyll pigments, plants cannot capture solar energy efficiently or drive the light-dependent reactions in photosystem II and photosystem I. This green pigment acts as the primary light-harvesting molecule essential for converting light into chemical energy in higher plants.
| 3. What happens during the Calvin cycle and how does it produce glucose? | |
Ans. The Calvin cycle operates in three phases: carbon fixation (CO₂ combines with RuBP via RuBisCO enzyme), reduction (using ATP and NADPH), and regeneration (reforming RuBP). Through multiple cycles, fixed carbon atoms accumulate to form glucose. The cycle doesn't directly produce glucose; instead, it generates G3P molecules that exit the cycle and combine to synthesize sugars in higher plant cells.
| 4. How do stomata control photosynthesis rates and gas exchange in leaves? | |
Ans. Stomata are microscopic pores on leaf surfaces that regulate carbon dioxide entry and oxygen release while minimising water loss. Guard cells control stomatal opening through osmotic pressure changes, responding to light, humidity, and CO₂ concentration. When stomata close during water stress, photosynthesis decreases because less CO₂ reaches photosynthetic tissues, directly limiting the rate of the entire process.
| 5. What's the role of photosystem I and photosystem II in light reactions? | |
Ans. Photosystem II absorbs light energy first, splitting water molecules and releasing electrons that travel through the electron transport chain, generating ATP via chemiosmosis. Photosystem I then re-energises these electrons using additional light energy to reduce NADP⁺ into NADPH. Together, both systems form the Z-scheme, sequentially producing the ATP and reducing power necessary for carbon fixation in the Calvin cycle during photosynthesis.
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Document Description: Flashcards: Photosynthesis in Higher Plants for NEET 2026 is part of Biology Class 11 preparation. The notes and questions for Flashcards: Photosynthesis in Higher Plants have been prepared according to the NEET exam syllabus. Information about Flashcards: Photosynthesis in Higher Plants covers topics like and Flashcards: Photosynthesis in Higher Plants Example, for NEET 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Flashcards: Photosynthesis in Higher Plants.
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