What causes a green plant exposed to the light, on only one side, to bend towards the source of light as it grows?
What causes a green plant exposed to the light, on only one side, to bend towards the source of light as it grows?
The correct option is A Auxin accumulates on the shaded side, stimulating greater cell elongation there
The correct option is A.
Explanation of the correct option:
- Auxin is the first discovered plant hormone.
- It is produced at the stem tip and promotes cell elongation.
- When light falls auxin moves to the darker side of the plant (Shaded region).
- It causes the cells in that region to grow larger than the cells corresponding to the lighter side of the plant.
- Thus the plant bends towards the source of light.
- Other plant hormones are Cytokinin, Gibberellins, Ethylene, Abscisic acid.
Explanation of the incorrect options:
Option B: Light does not stimulate plant cells on the lighted side to grow faster.
Option C: Green plants seek light because they are phototropic but this does not cause a green plant exposed to the light, on only one side, to bend towards the source of light as it grows.
Option D: Green plants need light to perform photosynthesis but this does not cause a green plant exposed to the light, on only one side, to bend towards the source of light as it grows.
Hence, auxin accumulates on the shaded side, stimulating greater cell elongation there causes a green plant exposed to the light, on only one side, to bend towards the source of light as it grows.
Auxin accumulates on the shaded side, stimulating greater cell elongation there
The correct option is A.
Explanation of the correct option:
- Auxin is the first discovered plant hormone.
- It is produced at the stem tip and promotes cell elongation.
- When light falls auxin moves to the darker side of the plant (Shaded region).
- It causes the cells in that region to grow larger than the cells corresponding to the lighter side of the plant.
- Thus the plant bends towards the source of light.
- Other plant hormones are Cytokinin, Gibberellins, Ethylene, Abscisic acid.
Explanation of the incorrect options:
Option B: Light does not stimulate plant cells on the lighted side to grow faster.
Option C: Green plants seek light because they are phototropic but this does not cause a green plant exposed to the light, on only one side, to bend towards the source of light as it grows.
Option D: Green plants need light to perform photosynthesis but this does not cause a green plant exposed to the light, on only one side, to bend towards the source of light as it grows.
Hence, auxin accumulates on the shaded side, stimulating greater cell elongation there causes a green plant exposed to the light, on only one side, to bend towards the source of light as it grows.
