Q. $ABA$ acts antagonistic to
BHUBHU 2012Plant Growth and Development
Solution:
Abscisic acid is an antagonist to gibberellins as shown in the table given below :
Abscisic acid
Gibberellic acid
It inhibits growth.
It promotes growth.
It promotes the dormancy
of seeds, buds and tubers.
It overcomes the natural
dormancy of seeds, tubers,
etc.
It inhibits the synthesis of
$RNA$ and proteins.
It promotes the synthesis of
$RNA$ and Proteins.
Causes abscission of flowers
and fruits.
Promotes development of
fruits.
Promotes leaf senescence.
Prevents leaf senescence.
Promotes stomatal closure.
Promotes stomatal opening.
Prevents amylase activity.
Promotes amylase activity
during seed germination.
| Abscisic acid | Gibberellic acid |
|---|---|
| It inhibits growth. | It promotes growth. |
| It promotes the dormancy of seeds, buds and tubers. | It overcomes the natural dormancy of seeds, tubers, etc. |
| It inhibits the synthesis of $RNA$ and proteins. | It promotes the synthesis of $RNA$ and Proteins. |
| Causes abscission of flowers and fruits. | Promotes development of fruits. |
| Promotes leaf senescence. | Prevents leaf senescence. |
| Promotes stomatal closure. | Promotes stomatal opening. |
| Prevents amylase activity. | Promotes amylase activity during seed germination. |