The gaseous plant growth regulator is used in plants to:
1. kill dicotyledonous weeds in the fields
2. speed up the malting process
3. promote root growth and root hair formation to increase the absorption surface
4. help overcome apical dominance

Subtopic:  Ethylene |
 73%
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NEET - 2022
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Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in plants?

1.Cytokinin2.ABA
3.Gibberellin4.Ethylene

Subtopic:  Ethylene |
 75%
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The living differentiated cells, that lost the capacity to divide anymore, can regain the capacity of division under certain conditions. This phenomenon is termed as:

1.Redifferentiation 2.Maturation 
3.Differentiation 4.Dedifferentiation 

Subtopic:  Differentiation, Dedifferentiation and Redifferentiation |
 73%
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NEET - 2022
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Which hormone is used to induce immediate stomatal closure in leaves? 
1. Cytokinin 
2. Gibberellin 
3. Abscisic Acid 
4. Auxin 

Subtopic:  Abscisic Acid |
 89%
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Removal of apical dominance by decapitation is utilised for: 
1. Suppressing the activity of intercalary meristem 
2. Early senescence 
3. Hedge making 
4. Preparing weed-free lawns 

Subtopic:  Growth Hormones & Auxin | Auxin Function |
 79%
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Which of the following growth regulators is an adenine derivative ?
1.Auxin2.Cytokinin
3.Ethylene4.Abscisic acid
Subtopic:  Growth Hormones & Auxin |
 72%
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The phenomenon by which the undividing parenchyma cells start to divide mitotically during plant tissue culture is called as :
1. Differentiation
2. Dedifferentiation
3. Redifferentiation
4. Secondary growth
Subtopic:  Differentiation, Dedifferentiation and Redifferentiation |
 70%
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The ability of plants to follow different pathways in response to environment leading to formation of different kinds of structures are called :
1. Redifferentiation
2. Development
3. Plasticity
4. Differentiation
Subtopic:  Development |
 91%
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Which one of the following plants does not show plasticity?
1. Maize 
2. Cotton 
3. Coriander 
4. Buttercup
Subtopic:  Development |
 82%
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Which hormone promotes internode/petiole elongation in deep water rice?
1.2, 4-D 2.GA3
3.Kinetin 4.Ethylene 
Subtopic:  Ethylene |
 69%
From NCERT
NEET - 2023
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