A Botanist Discovers a Plant That Lacks the Ability to Form

question 54

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.
• E) starch and downward movement are necessary for thigmotropism.

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Definitions:

FMRI

Functional Magnetic Resonance Imaging, a technique for measuring and mapping brain activity through changes in blood flow.

Brain Activity

The function and interaction of neurons in the brain, encompassing all mental and neurological processes.

Spatial Resolution

The ability of an imaging system to distinguish between two objects’ details and patterns that are close together.

MRI

Magnetic Resonance Imaging, a noninvasive medical imaging technique used to visualize detailed internal structures using strong magnetic fields and radio waves.