Question

EXPERIMENTATION AND FIELD INVESTIGATION
Observe the activity and answer the following questions,
Which hormone is responsible for the phenomenon shown in the picture ?
Which side of the shoot may have grown more and why?
Do you find any difference in the shape of epidermal cells ?
iv.
Define phototropism.​

Answer 1

Answer:

1) auxin

2) When a shoot is exposed to light coming from only one side, auxin becomes asymmetrically distributed across the growing region of the shoot and accumulates to higher concentrations on the side away from the light, causing the cells on the dark side to elongate more than those on the light side.

3) The straight protions of the epidermal cell shows no bending but the bending portions of epidermal cells shows bending.

4) Phototropism is the growth of an organism in response to a light stimulus. Phototropism is most often observed in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light contain a hormone called auxin that reacts when phototropism occurs.