Abscisic acid inhibits growth
A signal to stop growing.
Time to stop
Some plant hormones help a plant to grow. Plants also need signals to stop growing.
What might a hormone that stops growth do to a plant?
What this lesson covers
The idea
Abscisic acid is a plant hormone that inhibits growth; its effects include wilting of leaves.
Time to stop
Some plant hormones help a plant to grow. Plants also need signals to stop growing.
What might a hormone that stops growth do to a plant?
- Cause effects such as wilting of leaves
- Make the stem grow longer
- Make cells divide faster
Go and stop
Press Next step.
A brake for growth
Some hormones push growth. Abscisic acid acts like a brake.
Abscisic acid is a plant hormone that inhibits growth. Its effects include wilting of leaves.
Notes
Abscisic acid is a plant hormone that inhibits growth; its effects include wilting of leaves.
Check yourself
What does abscisic acid do?
Which is an effect of abscisic acid?
Why do plants need hormones like abscisic acid?
- It helps the stem grow. Gibberellins and auxins help in growth.
- It inhibits growth — correct. Yes!
- It promotes cell division. Cytokinins promote cell division.
- Bending of a shoot towards light. This happens because of auxin.
- Rapid cell division in fruits. Cytokinins are in greater concentration where cells divide rapidly.
- Wilting of leaves — correct. Yes!
- They also need signals to stop growing — correct. Yes!
- They need signals to make cells grow longer. Auxin and gibberellins help growth. Abscisic acid is a signal to stop it.
- They need signals to make the roots grow downwards. Roots grow downwards in response to gravity. Abscisic acid is a hormone that inhibits growth.