Question

Why is the closing of a dandelion flower at dusk (when it gets dark) not a tropism?

Answer 1

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"The 'closing' of a 'dandelion flower' at 'dusk' ( when it gets dark ) is not a tropism" because the direction of the dandelion flowers petal movement is not on the way of the stimulus light. That's why the dandelion flowers are close in the night.

Answer 2

Answer:

The closing of a dandelion flower at dusk ( when it gets dark ) is not a tropism because the direction of movement of petals of dandelion flower does not depend on the direction of stimulus light...