Question
Plants respond to different types of stimuli. What type of stimulus would cause the roots from seeds to grow downward while the shoot (stems and leaves) grow upward? Gravitropism Photoperiodism Radiotropism Thigmotropism
Answer
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(302 Votes)
Quentin
Veteran · Tutor for 9 years
Answer
The correct answer is 'Gravitropism'.
Explanation
## Step1The question is asking us to identify the type of stimulus that would cause the roots of seeds to grow downward while the shoot (stems and leaves) grow upward. This is a typical response of plants to a specific kind of stimulus.## Step2Gravitropism, also known as geotropism, is the term used to describe a plant's growth in response to the force of gravity. Roots usually grow downward (towards the force of gravity), while shoots or stems grow upward (opposite to the force of gravity).## Step3The other options provided, Photoperiodism, Radiotropism, and Thigmotropism, are not relevant to this context. Photoperiodism is a plant's response to the relative lengths of light and dark periods, while Radiotropism is a plant's response to radiation. Thigmotropism refers to a plant's growth in response to touch or physical contact with a solid object.