Standard Science Primary 6 Energy

An underwater plant was placed at different distances from a lamp. The number of bubbles produced was recorded. What is the relationship between the distance and the rate of photosynthesis?

A As distance increases, the rate increases.
B As distance decreases, the rate increases.
C Distance does not affect the rate.
D The plant stops producing bubbles if the lamp is too close.
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Worked Solution

Step 1: Bubbles represent oxygen produced during photosynthesis. Step 2: Shorter distance means higher light intensity. Step 3: Higher light intensity increases the rate of photosynthesis, producing more bubbles.

Correct answer: As distance decreases, the rate increases.

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