Photosynthesis quiz
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How do you test a leaf for starch?
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More questions about Photosynthesis
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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Where is about half of Earth's oxygen made?
Answer: In the ocean
Why: One tiny ocean microbe, Prochlorococcus, makes up to 20% of the biosphere's oxygen, more than all tropical rainforests.
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What supplies most of a tree's dry mass?
Answer: The air
Why: About half of a tree's dry mass is carbon, and nearly all of it was pulled from carbon dioxide in the air.
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Which molecule do plants split to release oxygen?
Answer: Water
Why: The oxygen atoms in carbon dioxide end up in the sugar and in new water, not in the oxygen gas a leaf gives off.
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How does CO₂ get into a leaf?
Answer: Through stomata
Why: Most broad leaves have more stomata on their shaded underside than on their sunny top.
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How does a sprouting seed get food before its leaves open?
Answer: From its own stores
Why: Most bean sprouts in shops grow in the dark on the bean's stored food, and without light they make no chlorophyll and stay pale.
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Which fruit crop takes in CO₂ mainly at night?
Answer: Pineapple
Why: A pineapple stores the night's CO₂ as malic acid, then uses it by day with its pores shut, saving water.
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