Question

define phototropism. how does it occur?​

Answer 1

• The growth of plant in response to light is known as photoperiodism.

• A plant part may be positively photo periodic or negatively photo period.

• If the plant part grows in the same direction as the light is it is known as positively photo periodic whereas if a plant   grows in the opposite direction of the light, it is known as negative photo periodic.

• This phenomenon occurs due to the presence of some hormones which are sensitive to light.

• For example the shoot of a plant is positively photo periodic where are the root of a plant is negative photo periodic.