Through their effect on plant growth regulators, what do the temperature and light control in the plants?

1. Flowering 

2. Closure of stomata

3. Fruit elongation 

4. Apical dominance 

Subtopic:  Photoperiodism (OLD NCERT) | Vernalization (OLD NCERT) |
 67%
From NCERT
AIPMT - 2012
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Vernalisation stimulates flowering in:
1. Turmeric
2. Carrot
3. Ginger
4. Zaminkand

Subtopic:  Vernalization (OLD NCERT) |
 77%
From NCERT
AIPMT - 2012
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Which one of the following generally acts as an antagonist to Gibberellins?
1. Ethylene
2. ABA
3. IAA
4. Zeatin

Subtopic:  Abscisic Acid |
 86%
From NCERT
AIPMT - 2012
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One of the commonly used plant growth hormone in tea plantations is:

1. Abscisic acid 2. Zeatin
3. Indole-3- acetic acid 4. Ethylene
Subtopic:  Growth Hormones & Auxin |
 77%
From NCERT
AIPMT - 2010
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Root development is promoted by:
1. Auxin
2. Gibberellin
3. Ethylene
4. Abscisic acid

Subtopic:  Growth Hormones & Auxin |
 76%
From NCERT
AIPMT - 2010
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The pineapple which under natural conditions is difficult to blossom has been made to produce fruits throughout the year by application of:
1. NAA, 2, 4- D
2. GA3
3. Cytokinin
4. IAA, IBA
Subtopic:  Auxin Function |
From NCERT
NEET - 2013
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An enzyme that can stimulate the germination of barley seeds is:

1. α-amylase

2. lipase

3. protease

4. invertase

Subtopic:  Gibberellin |
 76%
AIPMT - 2006
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Treatment of seed at low temperature under moist conditions to break its dormancy is called:

1. sacrification

2. vernalization

3. chelation

4. stratification

Subtopic:  Vernalization (OLD NCERT) |
AIPMT - 2006
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How does pruning help in making the hedge dense?

1. It includes the differentiation of new shoots from the rootstock
2. It frees axillary buds from apical dominance
3. The apical shoot grows faster after pruning
4. It releases wound hormones

Subtopic:  Auxin Function |
 62%
AIPMT - 2006
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Parthenocarpic tomato fruits can be produced by:

1. removing androecium of flowers before pollen grains are released
2. treating the plants with low concentrations of gibberellic acid and auxins
3. raising the plants from vernalised seeds
4. treating the plants with phenylmercuric acetate

Subtopic:  Auxin Function | Gibberellin |
 68%
From NCERT
AIPMT - 2006
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