Question

Which stimulus causes the roots of seedlings to grow downward? A. Sunlight B. Transpiration C. Rainfall D. Gravity

Answer 1

Answer: D

Step-by-step explanation:

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Answer 2

D.) Gravity

Step-by-step explanation:

Plant roots always grow downward because specialized cells in root caps detect and respond to gravity. This is an example of a tropism. A tropism is a turning toward or away from a stimulus in the environment. Growing toward gravity is called geotropism.