As a Seed Germinates,its Shoot Points Upward Toward Light,and Its

question 25

Multiple Choice

As a seed germinates,its shoot points upward toward light,and its root grows downward into the soil.Turn the plant sideways,and the stem and roots bend according to the new direction of gravity.How do roots and shoots grow in opposite directions as the plant is rotated?

• A)The roots and shoots respond oppositely to auxin
• B)Statoliths move in the opposite direction in roots and shoots
• C)The absorption of light by phytochromes only occurs in shoots
• D)The circadian rhythms of roots and shoots are opposite
• E)Through differences in thigmotropism

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