A Botanist Discovers a Plant That Lacks the Ability to Form

question 31

Multiple Choice

A botanist discovers a plant that lacks the ability to form starch grains in root cells,yet the roots still grow downward.This evidence refutes the long-standing hypothesis that

• A)falling statoliths trigger gravitropism.
• B)starch accumulation triggers the negative phototropic response of roots.
• C)starch grains block the acid growth response in roots.
• D)starch is converted to auxin,which causes the downward bending in roots.

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