Xerophytes Employ a Number of Different Strategies to Survive in Very

question 13

Multiple Choice

Xerophytes employ a number of different strategies to survive in very dry environments. The following table summarizes average stomatal densities from desert plants with four different ecological strategies.

Based on the data, plants adopting which ecological strategy are most likely to have stomata sunken below the epidermis or in crypts?

• A) stem succulents
• B) leaf succulents
• C) evergreen trees and shrubs
• D) deciduous trees and shrubs

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Definitions:

Neutral Stimulus

A stimulus that initially produces no specific response other than focusing attention.

Unconditioned Stimulus

A stimulus that naturally and automatically triggers a response without any prior learning.

Aquarium Light

A specialized form of lighting designed to simulate natural light and promote the health and behavior of aquatic plants and animals in aquariums.

Conditioned Stimulus

Within classical conditioning, an initially neutral stimulus becomes linked with an unconditioned stimulus and ultimately elicits a conditioned response.