Experimental plants that were sent up in space shuttle missions did not exhibit all of their normal tropisms.Which of the following responses would you most expect to be lacking from these plants?

Question

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Gravitropism is the growth response of a plant to gravity, which allows stems to grow upwards and roots to grow downwards. In space, there is no gravity, so plants would not be able to respond to that stimulus. The other responses listed (photoperiod, thigmotropism, and phototropism) are not directly related to gravity and are therefore less likely to be affected by space travel.

Experimental Plants That Were Sent Up in Space Shuttle Missions