CBSE - VI - Biology
please explain with the help of a diagram the effect of auxins in different parts of a plant.
Auxins are found in tips of the shoots and roots but can diffuse to other areas.
The hormones affect the rate of elongation of plant cells.
Effect of auxins:
- Shoot cells to grow more quickly
- Root cells to grow less quickly
- Auxins diffuse to the shaded areas of shoots and roots.
- In shoots the high concentration of auxin causes the shaded shoot cells to grow more quickly.
- The result is a shoot that bends towards the light.
- In roots the high concentration of auxin causes the shaded cells to grow more slowly.
- The result is a root that bends away from the light.
- Auxins are affected by gravity.
- In horizontal shoots there is a higher concentration of auxin at the bottom.
- This causes the bottom cells to grow more quickly, pushing the shoot up against gravity.
- In horizontal roots, there is also a higher concentration of auxin at the bottom.
- This causes the bottom cells to grow less quickly than the top cells, pushing the root into the ground.
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