Advanced Science Primary 5 Systems

A student coated the underside of all leaves of a plant with a layer of oil. After a few days, the plant died. Why?

A The plant could not transport food.
B The plant could not absorb sunlight.
C The plant could not absorb water.
D The plant could not carry out gaseous exchange.
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Worked Solution

Step 1: Stomata (tiny pores) are mostly located on the underside of leaves. Step 2: These pores are for taking in carbon dioxide and releasing oxygen/water vapor. Step 3: Oil blocks the stomata, stopping gaseous exchange.

Correct answer: The plant could not carry out gaseous exchange.

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