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Photosynthesis Questions and Answers
Free A Level Biology Flashcards
Work through both stages of photosynthesis, from the light dependent reactions in the thylakoid membranes to the Calvin cycle in the stroma. Free flashcards for GCSE and A Level Biology revision.
Question
Write the word equation for photosynthesis.
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Answer
Carbon dioxide + water → glucose + oxygen (using light energy).
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Question
Write the balanced symbol equation for photosynthesis.
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Answer
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
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Question
Where in the cell does photosynthesis occur?
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Answer
In the chloroplasts, specifically in the thylakoid membranes and stroma.
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Question
What pigment absorbs light for photosynthesis?
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Answer
Chlorophyll (found in chloroplasts).
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Question
What are the two stages of photosynthesis?
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Answer
The light-dependent reactions (in thylakoid membranes) and the light-independent reactions / Calvin cycle (in the stroma).
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Question
What three factors limit the rate of photosynthesis?
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Answer
Light intensity, carbon dioxide concentration, and temperature.
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Question
How does increasing light intensity affect the rate of photosynthesis?
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Answer
It increases the rate up to a limiting factor (e.g. CO₂ or temperature).
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Question
How does temperature affect photosynthesis?
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Answer
Higher temperatures increase the rate up to an optimum; beyond that, enzymes denature and the rate falls.
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Question
What is the compensation point?
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Answer
The light intensity at which the rate of photosynthesis equals the rate of respiration — no net gas exchange occurs.
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Question
What is glucose used for in plants?
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Answer
Respiration, cellulose synthesis (cell walls), stored as starch, and converted to amino acids and lipids.
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