name the hormone which is evolved in phototropism explain its role
Answers
Auxin is plant hormones that make some parts of a plant stem grow faster than others. The result is that the plant stem bends towards the light. You may have noticed that a houseplant grows towards the window and turns its leaves towards the light. It does this because light coming from the window side of the plant destroys the auxin in that side of the stem. So growth on that side slows down. On the shaded side of the plant there is more auxin. So growth on this side speeds up. The result is that the shoots and leaves are turned towards the light for photosynthesis. Auxin is produced in the tip of growing shoots. If the tips are removed, they cannot produce auxin, so phototropism cannot occur. If the tips are covered, light cannot break down the auxin, so phototropism cannot then occur either.