a) Leaves of a healthy potted plant were coated with Vaseline. Will this plant remain healthy for long? Give reasons for your answer. (b) What will happen to the rate of photosynthesis in a plant under the following circumstances? (i) Cloudy day in the morning but bright sunshine in the afternoon. (ii) No rainfall in the area for a considerable time. (iii) Gathering of dust on the leaves.
BiologyClass 10ICSEAnswered 27 Mar 2026
Answer
- The plant will not remain healthy for long because the Vaseline coating blocks the stomatal pores present on the Due to this blockage the exchange of gases does not take place in plants. The transpiration process will not continue and the plants cannot remove excess of water present in them. The photosynthesis process will not occur as the pores are closed and light cannot pass through the leaves.
- (i) The rate of photosynthesis in a plant decreases in the morning but increases in the afternoon during cloudy day in the morning but bright sunshine in the afternoon. As the rate of absorption of sunlight during sunshine is more.
- The rate of photosynthesis in a plant decreases when there is no rainfall in the area for a considerable time. The plants get dried due to the loss of water.
- The rate of photosynthesis in a plant decreases when the dust is gathered on leaves as it covers the stomatal pores and the exchange of gases does not take place.
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