AP BIOLOGY

LABORATORY REVIEW

TRANSPIRATION

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Increase in wind speed will not increase the rate of stomatal transpiration in which of the following situations?

A	all plants in night time
B	plants whose stomata have closed
C	plants with needle like leaves
D	plants with sunken stomata

Explanation:

Detailed explanation-1: -As the wind blows faster, the water released by transpiration is carried away faster. So, rate of transpiration increases with velocity of wind speed.

Detailed explanation-2: -Final answer: Age of plant does not affect the rate of transpiration.

Detailed explanation-3: -In succulent plants like Cacti and Bryophyllum, the stomata remain open during night and closed during the day to reduce transpiration. This kind of stomatal behavior is termed scotoactive.

Detailed explanation-4: -Wind-often causes closure because it: (a) brings CO2 enriched air; and (b) increases the rate of transpiration that causes water stress which causes the stomata to close. In some cases, wind causes stomatal opening to increase transpiration for cooling.

There is 1 question to complete.