1. Potometer is an instrument used for demonstration of transpiration occurring from the lower surface of a leaf.

2. Hydathodes are similar to stomata in plant physiology.

3. Atmospheric humidity promotes transpiration from a green plant.

4. Some desert plants have sunken stomata on their leaves.

5. Most transpiration occurs during mid-day.

Answers:

1. False. Reason: The Photometer is an instrument that measures the amount of water consumed by a plant and this water intake is almost equal to the water lost through transpiration.

2. False. Reason: Hydathodes are special structures that hold poles located at the edges of the leaf to allow exudation.

3.False. Reason: Transpiration slows down when the air outside is moist. High humidity in the air reduces the level of external distribution of internal water vapor across the stomata, thereby reducing the transpiration rate.

4. True. Reason: Many plants, especially those that grow in dry climates, have evolved from a variety of permanent mutations to prevent transpiration. The stomata can be immersed or covered with hair.

5. True. Reason: Transpiration occurs as long as the stomata is open, but stops when it is closed. As the stomata opens during the day, the diffusion of gases inside and out begins to meet the need for photosynthesis and to allow breathing.