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  • Following are certain facts about the effect of abscisic acid (ABA) on the development and physiology effect of plants. P. ABA promotes leaf senescence independent of ethylene. Q.

Following are certain facts about the effect of abscisic acid (ABA) on the development and physiology effect of plants.

P. ABA promotes leaf senescence independent of ethylene.
Q. ABA promotes shoot growth and inhibits root growth at low water potentials.
R. ABA inhibits gibberellin induced enzyme production.
S. Seed dormancy is controlled by the ratio of ABA and gibberellin .

Which one of the following combinations of the above statements is true?

Option: 1

P. Q and R
 


Option: 2

Q, Rand S


Option: 3

P. Q and S

 


Option: 4

P, R and S


Answers (1)

best_answer

ABA is a plant hormone that is primarily associated with stress responses, particularly drought stress. When a plant experiences water deficit or low water potential, ABA levels increase, and it acts as a signaling molecule to initiate various adaptive responses to conserve water and maintain plant survival.

One of the main effects of ABA in response to water deficit is the inhibition of shoot growth. ABA signals the plant to limit water loss by reducing transpiration and stomatal closure, which leads to a decrease in shoot growth. This helps to conserve water and prevent further dehydration.

On the other hand, ABA promotes root growth under water deficit conditions. It enhances root elongation and branching, allowing the roots to explore a larger volume of soil and increase water uptake efficiency. ABA also plays a role in inducing the synthesis of proteins and molecules involved in stress tolerance, which can help the roots withstand drought conditions.

Therefore, ABA inhibits shoot growth and promotes root growth in response to low water potentials or drought stress, which allows the plant to adapt and survive under water-limited conditions.

Hence statement Q is wrong. Hence, the correct answer is option 4. 

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Rishi

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