(a) Leaves of a healthy potted plant were coated with vaseline. Will this plant maintain healthy for long? Give reason for your answer.(b) What will happen to the rate of photosynthesis in a plant under the following circumstances?
(i) cloudy day in morning but bright sunshine in the afternoon
(ii) no rainfall in the area for a considerable time.
(iii) gathering of dust on the leaves

(a) If leaves of a healthy potted plant were coated with vaseline, it will not remain healthy for long.

Due to the coating of vaseline, the stomatal pores will be blocked. Hence, the plant will not be able to get oxygen for respiration and carbon dioxide for photosynthesis. Transpiration will also stop so the plants will not be able to remove excess water present in them. The photosynthesis process will not occur as the pores are closed and light cannot pass through the leaves, and the plant will ultimately die.

(b) (i) The rate of photosynthesis decreases in the morning but increases in the afternoon, as the rate of absorption of sunlight during sunshine is more.

(ii) The rate of photosynthesis decreases when there is no rainfall in the area for a considerable time. The plants get dried due to the loss of water.

(iii) The rate of photosynthesis decreases when the dust is gathered on leaves as it covers the stomatal pores and the exchange of gases does not take place properly.

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Updated on: 27-Mar-2023

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