Plant Physiology - Photosynthesis

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Q1. Which of the following processes occurs in the thylakoid membranes of chloroplasts? (2020)

Solution:

The light-dependent reactions of photosynthesis occur in the thylakoid membranes.

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Q2. Which of the following wavelengths of light is least effective for photosynthesis? (2020)

Solution:

Green light is least effective for photosynthesis because it is mostly reflected by chlorophyll.

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Q3. What is the significance of the light-independent reactions? (2023)

Solution:

The light-independent reactions, also known as the Calvin cycle, fix carbon dioxide into organic molecules.

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Q4. Which of the following processes occurs in the thylakoid membranes? (2020)

Solution:

The light-dependent reactions of photosynthesis occur in the thylakoid membranes.

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Q5. What is the significance of the light-harvesting complexes in photosynthesis? (2019)

Solution:

Light-harvesting complexes absorb light energy and transfer it to the reaction center in photosystems.

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Q6. Which wavelength of light is least effective for photosynthesis? (2022)

Solution:

Green light is least effective for photosynthesis because it is mostly reflected by chlorophyll.

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Q7. Which wavelength of light is most effective for photosynthesis? (2020)

Solution:

Blue light is most effective for photosynthesis as it is absorbed strongly by chlorophyll.

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Q8. What is the significance of the light-independent reactions of photosynthesis? (2023)

Solution:

The light-independent reactions, or Calvin cycle, are significant for fixing carbon dioxide into organic molecules.

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Q9. What is the role of NADP+ in photosynthesis? (2021)

Solution:

NADP+ acts as an electron carrier, becoming reduced to NADPH during the light-dependent reactions.

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Q10. What is the function of stomata in plants? (2019)

Solution:

Stomata are small openings on leaves that facilitate gas exchange, allowing CO2 in and O2 out.