You are studying a plant from the arid southwestern United States. Which of the
ID: 53633 • Letter: Y
Question
You are studying a plant from the arid southwestern United States. Which of the following adaptations is least likely to have evolved in response to water shortages?
Closing the stomata during the hottest time of day
Development of large leaf surfaces to absorb water
Formation of a fibrous root system spread over a large area
Mycorrhizae associated with the root system
A thick waxy cutical on the epidermis
Closing the stomata during the hottest time of day
Development of large leaf surfaces to absorb water
Formation of a fibrous root system spread over a large area
Mycorrhizae associated with the root system
A thick waxy cutical on the epidermis
Explanation / Answer
Plants in arid southwestern united states must be able to guard its water hoard in a desiccating environment and use it as efficiently as possible. The stems and leaves of most species have waxy cuticles that render them nearly waterproof when the stomates are closed. Water is further conserved by reduced surface areas; most plants have few leaves (agaves), no leaves (most cacti), or leaves that are deciduous in dry seasons (elephant tree [Bursera spp.], boojums [Fouquieria columnaris]).
Therefore the correct option is:
A thick waxy cutical on the epidermis
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