What is proved when starch is not formed in the non-green part of a leaf?
Answer and explanation
Correct answer: Chlorophyll is necessary for photosynthesis
The governing concept is the need for chlorophyll in photosynthesis. A non-green region generally lacks chlorophyll or contains too little of it to absorb light effectively. Without this pigment, the light-dependent energy capture needed for food formation is greatly reduced, so starch is not detected there by iodine. Option A is therefore correct. Leaf thickness, roots and blood are not the required factors stated by this controlled observation.
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What is the correct answer to this question?
Chlorophyll is necessary for photosynthesis
Why is this the correct answer?
The governing concept is the need for chlorophyll in photosynthesis. A non-green region generally lacks chlorophyll or contains too little of it to absorb light effectively. Without this pigment, the light-dependent energy capture needed for food formation is greatly reduced, so starch is not detected there by iodine. Option A is therefore correct. Leaf thickness, roots and blood are not the required factors stated by this controlled observation.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
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