PLANTS
PLANT RESPONSES TO STIMULI
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A seedling growing towards a sunny window.
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Plant roots growing down into the soil.
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Flowers producing nectar to attract bees.
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A potted plant wilting when it dries out.
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Detailed explanation-1: -Geotropism is a force that affects certain organisms. Which of the following is an example of a plant responding to the external stimulus of gravity? A seedling growing towards a sunny window.
Detailed explanation-2: -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.
Detailed explanation-3: -Examples of stimuli and their responses: You are hungry so you eat some food. A rabbit gets scared so it runs away. You are cold so you put on a jacket.
Detailed explanation-4: -Geotropism explains which of the following phenomena? A seed is planted upside-down, but the roots still grow in the direction of gravity.
Detailed explanation-5: -Plants also detect and respond to the daily cycle of light and darkness. For example, some plants open their leaves during the day to collect sunlight and then close their leaves at night to prevent water loss. Environmental stimuli that indicate changing seasons trigger other responses.