Question

Give reasons for the following:

The rate of transpiration is more on a bright sunny day than a cloudy day.

Answer 1

1. The water loss in plants due to evaporation into the atmosphere is called transpiration.
2. The stomata are the pores on leaves that allow the exchange of gases and water vapor in plants.
3. The stomatal pores remain open on a bright sunny day due to the uptake of CO₂ for conducting photosynthesis in plants.
4. Open stomata increase water loss in plants.
5. The photosynthesis rate decreases on a cloudy day due to the absence of sunlight.
6. Closed stomata reduces the transpiration rate in plants.

The transpiration rate is more on a bright sunny day due to a greater photosynthesis rate in plants than on a cloudy day.