Standard Science Primary 4 Systems

Siti observed tiny openings on the underside of a leaf. What is the primary function of these openings?

A To transport water to the flower.
B To allow for the exchange of gases.
C To absorb sunlight for photosynthesis.
D To prevent water loss.
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Worked Solution

Step 1: Identify the openings (stomata). Step [2-9]: Stomata are found mainly on the underside of leaves. Step [2-9]: They allow oxygen, carbon dioxide, and water vapour to move in and out of the plant.

Correct answer: To allow for the exchange of gases.

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