Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called:

1. Efficiency index 2. Plasticity
3. Norm of reaction 4. Developmental noise

Subtopic:  Growth Terminology | Development |
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Difference in shapes of leaves produced in air and those produced in water represents heterophyllous development due to environment in:

1. Cotton 2. Coriander
3. Larkspur 4. Butter cup
Subtopic:  Development |
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Identify the incorrectly matched pair:

PGR Chemical nature
1. Auxins Indole compounds
2. Cytokinin Pyrimidine derivatives
3. ABA Carotenoid derivative
4. Gibberellic acid Terpenes
Subtopic:  Cytokinin |
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Identify the plant growth regulator that, though is largely an inhibitor but, can be placed in both plant growth promoter and plant growth inhibitor groups?

 
1. Auxins 2. Gibberellins
3. Ethylene 4. Abscisic acid
Subtopic:  Ethylene |
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Identify the incorrectly matched pair:

Scientist PGR discovery
1. Cousins Ethylene
2. Kurosawa Gibberellin
3. Skoog and Miller ABA
4. F. W. Went Auxin
Subtopic:  Gibberellin | Cytokinin | Ethylene | Abscisic Acid |
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Callus from internodal segments of tobacco stem gets proliferated only if in addition to one of the following – extracts of vascular tissues, yeast extract, coconut milk or DNA, the nutrient medium also contains:

1. Auxins 2. Gibberellins
3. ABA 4. Ethylene
Subtopic:  Growth Hormones & Auxin |
 69%
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Auxin was first isolated from:

 
1. Coconut milk 2. Barley endosperm
3. Oat coleoptiles 4. Human urine
Subtopic:  Growth Hormones & Auxin |
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Auxin does not:
1. Help to initiate rooting in stem cuttings
2. Promote female flowers in cucumbers
3. Prevent fruit and leaf drop in early stages
4. Promote abscission of older mature leaves and fruits

Subtopic:  Growth Hormones & Auxin |
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To extend their market period, fruits can be left on trees longer by the application of:

 
1. Auxin 2. Gibberellins
3. Cytokinin 4. ABA
Subtopic:  Gibberellin |
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Kinetin was first discovered from:

 
1. Herring sperm DNA 2. Coconut milk
3. Yeast extract 4. Corn kernels
Subtopic:  Cytokinin |
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