▶️ Answer/Explanation
Ans: A
Increasing wind speed enhances the rate of transpiration by removing the moist air around the stomata, creating a steeper water vapor gradient. This causes more water to evaporate from the leaf surface.
Graph A correctly depicts this relationship, showing a steady rise in transpiration rate as wind speed increases. The other graphs either show no effect (B/C) or a decrease (D), which contradicts biological principles.
The diagram shows the pathway of water molecules through a leaf and out to the environment.
mesophyll cell → process X → air space → process Y → stomata
Which statements are correct?
- Process X is active transport.
- Process X is evaporation.
- Process Y is diffusion.
- Process Y is osmosis.
A) 1 and 3
B) 1 and 4
C) 2 and 3
D) 2 and 4
▶️ Answer/Explanation
Ans: C
Process X (mesophyll cell → air space): Water evaporates from the mesophyll cell surfaces into the air spaces. This is evaporation (Statement 2), not active transport (Statement 1 is incorrect).
Process Y (air space → stomata): Water vapor diffuses out through the stomata. This is diffusion (Statement 3), not osmosis (Statement 4 is incorrect).
Since Statements 2 and 3 are correct, the answer is C (2 and 3).