NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Biology
- Chapter
- Chapter
NEET 2026 · Biology · Chapter
The plant growth regulator that is widely known to act as an...
The plant growth regulator that is widely known to act as an antagonist to gibberellic acid is primarily responsible for:
Options
- Ainitiating rooting in stem cuttings.
- Bpromoting nutrient mobilisation which helps in the delay of leaf senescence.
- Cstimulating the closure of stomata in the epidermis.
- Dincreasing the length of the grape stalks.
Correct answer
C. stimulating the closure of stomata in the epidermis.
Step-by-step solution
The plant growth regulator that acts as an antagonist to gibberellic acid is abscisic acid (ABA).
Abscisic acid is widely known as a stress hormone as it increases the tolerance of plants to various kinds of environmental stresses.
A major function of abscisic acid is to stimulate the closure of stomata in the epidermis, thereby preventing water loss during water stress conditions.
Initiating rooting in stem cuttings is a function of auxins.
Promoting nutrient mobilisation which helps in the delay of leaf senescence is a function of cytokinins.
Increasing the length of grape stalks is a function of gibberellins.
Answer: stimulating the closure of stomata in the epidermis.
Abscisic acid is widely known as a stress hormone as it increases the tolerance of plants to various kinds of environmental stresses.
A major function of abscisic acid is to stimulate the closure of stomata in the epidermis, thereby preventing water loss during water stress conditions.
Initiating rooting in stem cuttings is a function of auxins.
Promoting nutrient mobilisation which helps in the delay of leaf senescence is a function of cytokinins.
Increasing the length of grape stalks is a function of gibberellins.
Answer: stimulating the closure of stomata in the epidermis.