Question

The factor that does not affect the rate of transpiration.

1. Intensity of light

2. Velocity of wind

3. Carbon dioxide

4. Oxygen
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Answer 1

The variable that does not affect the rate of transpiration: Oxygen

Explanation:

The factors that affect the rate of transpiration are:

• The rate of transpiration is proportional to the amount of light available. Light has two modes of action: direct and indirect. The temperature of leaf cells rises as the light intensity rises, increasing the rate at which liquid water is converted into vapor.  

• The rate of transpiration is substantially influenced by wind velocity. Fast-moving air currents maintain a high rate of transpiration by constantly bringing fresh, dry volumes of air into contact with leaf surfaces.
• Reduced CO2 concentration encourages stomatal opening, while increased CO2 concentration encourages stomatal closure.