Auxin can be bioassayed by

1. Avena coleoptiles curvature

2. Hydroponics

3. Ptometer

4. Lettuce hypocotyls elongation

Subtopic:  Growth Hormones & Auxin |
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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 |
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Typical growth curve in plants is
1. sigmoid
2. linear
3. stair-steps shaped
4. parabolic

 

Subtopic:  Growth Model |
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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. Of what significance is 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 demonstated polar movements of auxins.

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

1. Mutated

2. Embolised

3. Etiolated

4. Defoliated

Subtopic:  Development |
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Which one of the following growth regulators is known as stress hormone ?

1. Abscissic acid

2. Ethylene

3. GA3

4. Indole acetic acid

Subtopic:  Abscisic Acid |
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During seed germination its stored food is mobilized by

1. Cytokinin

2. ABA

3. Gibberellin

4. Ethylene

Subtopic:  Gibberellin |
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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 | Vernalization |
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Vernalisation stimulates flowering in -
1. Turmeric
2. Carrot
3. Ginger
4. Zaminkand

Subtopic:  Vernalization |
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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 |
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