Q3 of 36 Page 261

A. What does a root do in response to gravity? What is this phenomenon known as?

B. What does a stem do in response to light? What is this phenomenon known as?

(A) The root grows towards the stimulus, that is it responds under the force of gravity positively.

This phenomenon is known as positive geotropism.


(B) The stem shows growth in response to the light, that is towards the light. This phenomenon is known as positive phototropism.


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