The Primary Root of a Seedling Grows Down

question 14

Multiple Choice

The primary root of a seedling grows down

• A) to avoid light.
• B) in response to gravity.
• C) because the cells on the upper surface of the root elongate more rapidly than those on the lower surface of the root.
• D) in response to different concentrations of auxin.
• E) because of all of these except "to avoid light."

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