Multiple Choice
Which tissue acts as a filter on the water absorbed by root hairs in plants?
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6. The Membrane
Introduction to Membrane Transport
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Which of the following best defines cutaneous transpiration?
A
The process by which plants lose water vapor through stomata
B
The active transport of ions across the plasma membrane
C
The movement of water across cell membranes via aquaporins
D
The loss of water through the skin by evaporation, independent of sweat glands
Verified step by step guidance1
Understand the term 'cutaneous transpiration': It refers to the loss of water through the skin by evaporation, independent of sweat glands. This process occurs passively and is distinct from sweating, which involves sweat glands actively secreting fluid.
Compare the given options to the definition of cutaneous transpiration: Eliminate options that describe processes unrelated to the skin or evaporation, such as those involving plants or cellular transport mechanisms.
Option 1 describes water loss in plants through stomata, which is unrelated to the skin. Eliminate this option.
Option 2 refers to active transport of ions across the plasma membrane, which is a cellular process and not related to water loss through the skin. Eliminate this option.
Option 3 describes water movement across cell membranes via aquaporins, which is a molecular process and not related to evaporation through the skin. Eliminate this option. The correct answer is the fourth option, as it matches the definition of cutaneous transpiration.
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