Auxin can be bioassayed by?

1. Avena coleoptiles curvature

2. Hydroponics

3. Ptometer

4. Lettuce hypocotyl elongation

Subtopic:  Growth Hormones & Auxin |
 90%
NEET - 2015
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What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows?

1. Green plants need light to perform photosynthesis
2. Green plants seek light because they are phototropic
3. Light stimulates plant cells on the lighted side to grow faster
4. Auxin accumulates on the shaded side, stimulating greater
cell elongation there

Subtopic:  Growth Hormones & Auxin |
 79%
NEET - 2015
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The typical growth curve in plants is:

1. sigmoid
2. linear
3. stair-steps shaped
4. parabolic
Subtopic:  Growth Model |
 87%
From NCERT
NEET - 2015
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Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly - cut coleoptile stumps. What is the significance of this experiment?
 

1. It made possible the isolation and exact identification of auxin.
2. It is the basis for the quantitative determination of small amounts of growth-promoting substances.
3. It supports the hypothesis that IAA is auxin.
4. It demonstrates the polar movements of auxins.

Subtopic:  Growth Hormones & Auxin |
AIPMT - 2014
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A few normal seedlings of a tomato were kept in a dark room. After a few days, they were found to have become white-coloured like albinos, Which of the following terms will you use to describe them?

1. Mutated

2. Embolised

3. Etiolated

4. Defoliated

Subtopic:  Development |
 68%
AIPMT - 2014
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Which one of the following growth regulators is known as the stress hormone?

1. Abscisic acid

2. Ethylene

3. GA3

4. Indole acetic acid

Subtopic:  Abscisic Acid |
 94%
From NCERT
AIPMT - 2014
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During seed germination its stored food is mobilized by:

1. Cytokinin

2. ABA

3. Gibberellin

4. Ethylene

Subtopic:  Gibberellin |
AIPMT - 2013
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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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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) |
 78%
From NCERT
AIPMT - 2012
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