Stomata Appear to Have Arisen First in the

question 32

Multiple Choice

Stomata appear to have arisen first in the

• A) horsetails.
• B) mosses.
• C) liverworts.
• D) gymnosperms.
• E) angiosperms.

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Definitions:

Difference Threshold

The smallest amount by which a stimulus must be changed in order to notice that the change has occurred, also known as the just noticeable difference (JND).

Stimulus Level

The intensity of a stimulus which may influence the response it elicits from an organism or process.

Just Noticeable Difference

The smallest change in the intensity of a stimulus that can be detected.

Weber's Law

A principle in psychology stating that the just-noticeable difference in a stimulus is proportional to the magnitude of the original stimulus.