Question

why does sunflower face the sun in the presence of Sunlight always

Answer 1

Hey

✔ auxins is a hormone which is present in sunflower which are sensitive to sunlight and do everything they can to seek shade! So they migrate from the part of the plant bathed in sunlight to the shaded region in the stem. Once there, the auxins (which are essentially growth hormones) stimulate the growth of cells. This causes the stem to become bulkier in the shaded region, so the flower ends up bending in the opposite direction – towards the Sun.


Hope it helps to you.

Answer 2

Facing of sunflower towards the sun is known as phototropic movement. This is due to presence of auxin, a growth harmone in the stem.
When the stem tip receives unilateral light, the concentration of auxin increases in the shaded side.
The higher concentration of auxin in the shaded side causes that side to grow faster, resulting in a positive phototropic curvature.