Phototropism and gravitropism are by far the most important and widespread of tropisms in plants. In some plants and organs, other physical stimuli, including touch, temperature, and water, can orient growth as well. Tropisms allow plants to adjust the direction of growth when their environment changes.

How do tropisms help plants survive?

In order to survive, plants require light and water for photosynthesis . They have developed responses called tropisms to help ensure they grow towards adequate sources of light and water. This increases a plant’s chance of survival.

What are the advantages of tropism to farmers?

Stems growing up and toward the light will be able to expose their leaves so that photosynthesis can occur, their flowers will be more visible and they will be better able to spread seed (a reproductive advantage).