AP BIOLOGY

PLANTS

TRANSPORT IN PLANTS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What could increase the rate of water uptake (transpiration) by a plant?
A
Placing it in a refridgerator
B
placing a clear plastic bag over the plant (increases humidity)
C
removing the leaves from the plant
D
shining a bright light on the plant
Explanation: 

Detailed explanation-1: -Plants transpire more rapidly in the light than in the dark. This is largely because light stimulates the opening of the stomata (a mechanism). Light also speeds up transpiration by warming the leaf. Plants transpire more rapidly at higher temperatures because water evaporates more rapidly as the temperature rises.

Detailed explanation-2: -The xylem cells make up a tube starting from the leaves, down the stem, till the roots. This creates a drinking straw from which the water travels from the roots to the leaves. Hence, if the rate of transpiration increase, the uptake of water from the roots and the shoots also increases.

Detailed explanation-3: -Light intensity: The transpiration rate is increased due to the increase in light intensity. During daytime in the sunlight, the rate of transpiration is faster. This is because the stomata remains open to allow the inward diffusion of carbon dioxide for photosynthesis.

Detailed explanation-4: -The rate of transpiration increases with an increase in temperature. The rise in temperature causes an increase in the evaporation of water from the surface of leaves.

There is 1 question to complete.