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A student keeps an aquatic plant in water in bright light and counts the bubbles released. Which change would most reduce the number of bubbles?

(a) replacing the water with fresh pond water Your answer
(b) warming the water slightly from 15°C to 25°C Your answer
(c) adding a little sodium bicarbonate to the water Your answer
(d) moving the plant to dim light Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

Moving the plant to dim light reduces the light available, so photosynthesis slows and fewer O₂ bubbles are released.

Why the other options are wrong

(a) · your answer Fresh pond water would not reduce photosynthesis; it may even supply CO₂.
(b) · your answer Slight warming within this range usually increases the rate.
(c) · your answer Sodium bicarbonate supplies CO₂ and increases bubbles.

NCERT point: Light is the limiting factor in dim light.

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