Question

why the shoot of the plant show positive phototropism​

Answer 1

$\huge \mathfrak{ANSWER : }$

• Growth towards a light source is called positive phototropism, while growth away from light is called negative phototropism (skototropism)

• Most plant shoots exhibit positive phototropism, and rearrange their chloroplasts in the leaves to maximize photosynthetic energy and promote growth

Answer 2

Answer:

Because of Auxin Hormone

Explanation:

The auxin hormone is present at the shady tip of the plant. When sunlight falls on one side of the plant , then the hormone Auxin diffuses to rhe shady part of the plant . It stimulates growth. It's concentration becomes higher. Thus it helps in the growth of the region which is away from that part of the plant which is faced towards the light.

So that part of the plant which is faced away from sunlight grows longer than the part which is faced towards sunlight. so it appears as if the Shoot bends/grows towards the light and it thus shows positive Phototropism