Q. No.Auxin can be bioassayed by?
1. Avena coleoptiles curvature
2. Hydroponics
3. Ptometer
4. Lettuce hypocotyl elongation
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 |
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. |
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
Which one of the following growth regulators is known as the stress hormone?
1. Abscisic acid
2. Ethylene
3. GA3
4. Indole acetic acid
During seed germination its stored food is mobilized by:
1. Cytokinin
2. ABA
3. Gibberellin
4. Ethylene
1. NAA, 2, 4- D
2. Phenylacetic acid
3. Cytokinin
4. IAA, IBA
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
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