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A leaf partly covered with black paper and then exposed to light shows starch only in the exposed part. This shows that photosynthesis needs
Your answer:
Correct answer: (a)
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Explanation
Why (a) is correct
Only the part of the leaf that received light formed starch, so light is necessary for photosynthesis.
Why the other options are wrong
- (b) · your answer CO2 reached the whole leaf; this experiment does not test CO2.
- (c) · your answer Water reached the whole leaf; it is not the variable tested here.
- (d) · your answer Chlorophyll was present under the paper too; only light was cut off.
NCERT point: Half-leaf experiments are used to show the need for light, CO2 and chlorophyll.
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