The plant hormone used to destroy weeds in a field is:
1. 2, 4-D
2. IBA
3. IAA
4. NAA

Subtopic:  Auxin Function |
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Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called:
1. Plasticity
2. Maturity
3. Elasticity
4. Flexibility

Subtopic:  Development |
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The site of perception of light in plants during photoperiodism is:

1. Axillary bud

2. Leaf

3. Shoot apex

4. Stem

Subtopic:  Photoperiodism |
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Coconut milk factor is: -
1. An auxin
2. A gibberellin
3. Abscisic acid
4. Cytokinin

Subtopic:  Cytokinin |
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Seed dormancy is due to the : -
1. Ethylene
2. Abscissic acid
3. IAA
4. Starch

Subtopic:  Abscisic Acid |
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Which of the following PGR is present in coconut milk which is used in tissue culture?

1. Cytokinin

2. Auxin

3. Gibberellin

4. Ethylene

Subtopic:  Cytokinin |
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Which hormone is responsible for fruit ripening :

1. Ethylene

2. Auxin

3. Ethyl chloride

4. Cytokinin

Subtopic:  Ethylene |
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If the apical bud has been removed then we observe :

1. More lateral branches

2. More axillary buds

3. Plant growth stops

4. Flowering stops

Subtopic:  Auxin Function |
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Cell elongation in internodal regions of the green plants takes place due to:-
1. Cytokinins
2. Gibberellins
3. Ethylene
4. Indole acetic acid 

Subtopic:  Gibberellin |
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The maximum growth rate occurs in:-

1. Senescent phase

2. Lag phase

3. Exponential phase

4. Stationary phase 

Subtopic:  Growth Model |
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