Standard Science Primary 5 Systems

On which part of the leaf are the most stomata usually found, and why?

A Lower surface, to reduce water loss.
B The petiole, to transport water.
C Upper surface, to catch more sunlight.
D The edges, to exchange gases faster.
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Worked Solution

Step 1: Stomata are pores for gaseous exchange. Step 2: Placing them on the lower surface protects them from direct sunlight. Step 3: This prevents excessive evaporation (transpiration) during the day.

Correct answer: Lower surface, to reduce water loss.

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