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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Phototropic curvature is the result of uneven distribution of

1. gibberellin

2. phytochrome

3. cytokinins

4. auxin

Subtopic:  Growth Hormones & Auxin |
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Photoperiodism was first characterized in

1. tobacco

2. potato

3. tomato

4. cotton

Subtopic:  Photoperiodism |
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Coiling of garden pea tendrils around any support is an example of

1. thigmotaxis

2. thigmonasty

3. thigmotropism

4. thermotaxis

Subtopic:  Growth | Development |
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One of the synthetic auxin is

1. NAA

2. IAA

3. GA

4. IBA

Subtopic:  Growth Hormones & Auxin | Auxin Function |
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Which one of the following acids is a derivative of carotenoids?

1. Indole-butyric acid

2. Indole-3-acetic acid

3. Gibberellic acid

4. Abscisic acid`

Subtopic:  Abscisic Acid |
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Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in

1.  vessels and tracheid differentiation

2.  leaf abscission

3.  annual plants

4.  floral parts.

Subtopic:  Auxin Function | Cytokinin | Ethylene | Abscisic Acid |
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