A student investigating transpiration in a hibiscus plant applied petroleum jelly to the lower surface of several leaves. After two hours in sunlight, these leaves lost less mass than untreated leaves. What does this experiment demonstrate?

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Question

A student investigating transpiration in a hibiscus plant applied petroleum jelly to the lower surface of several leaves. After two hours in sunlight, these leaves lost less mass than untreated leaves. What does this experiment demonstrate?

Accepted Answer

Most stomata are located on the lower leaf surface — Award 1 mark for linking reduced water loss to blocked stomata. B is incorrect — petroleum jelly blocks gas exchange, reducing photosynthesis. C is incorrect — water exits through stomata, not enters. D is incorrect — cuticle is present on both surfaces but stomata are concentrated below.

Answer

Petroleum jelly increases photosynthesis

Answer

Most stomata are located on the lower leaf surface

Answer

Water enters leaves through the lower surface

Answer

The cuticle is absent from the lower surface

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