Question

Which one of the following weather conditions would cause the greatest rate of transpiration?

Answer 1

Cool temperatures, low humidity, breezy
Cool temperatures, high humidity, and no wind
High temperatures, high humidity, breezy
OR
High temperatures, low humidity, breezy

Answer 2

\[Environmental~~ factors ~~that ~~affect ~~the~~ rate ~of~ ~transpiration\]

1. Temperature
Plants transpire more rapidly at higher temperatures because water evaporates more rapidly as the temperature rises. At 30°C, a leaf may transpire three times as fast as it does at 20°C.

2. Humidity
The rate of diffusion of any substance increases as the difference in concentration of the substances in the two regions increases.When the surrounding air is dry, diffusion of water out of the leaf goes on more rapidly.

3. Wind
When there is no breeze, the air surrounding a leaf becomes increasingly humid thus reducing the rate of transpiration. When a breeze is present, the humid air is carried away and replaced by drier air.

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