Answer:
1,2,4,5,6
Explanation:
1.) Thigmotropism is a plant’s response to touch.
2.) Thigmotropism is a plant’s response to an external stimulus.
4.) Thigmotropism can occur quickly or slowly.
5.) Thigmotropism may involve the way in which a plant grows.
6.) Thigmotropism may involve the closing and opening of plant leaves.