If a thick layer of petroleum jelly is applied on leaves, why can the rate of photosynthesis decrease?
Answer and explanation
Correct answer: Because stomata get blocked and carbon dioxide entry decreases
The governing concept is gas exchange during photosynthesis. Carbon dioxide is a necessary raw material and normally enters the leaf mainly through stomata. A thick petroleum-jelly layer can cover or block these pores, reducing carbon-dioxide diffusion. Even if light and water remain available, less carbon dioxide limits glucose formation and therefore lowers the photosynthetic rate. Option A states this cause; the other options describe processes that are unrelated or biologically impossible.
Frequently asked questions
What is the correct answer to this question?
Because stomata get blocked and carbon dioxide entry decreases
Why is this the correct answer?
The governing concept is gas exchange during photosynthesis. Carbon dioxide is a necessary raw material and normally enters the leaf mainly through stomata. A thick petroleum-jelly layer can cover or block these pores, reducing carbon-dioxide diffusion. Even if light and water remain available, less carbon dioxide limits glucose formation and therefore lowers the photosynthetic rate. Option A states this cause; the other options describe processes that are unrelated or biologically impossible.
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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