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Q. No.Auxin can be bioassayed by?
1. Avena coleoptiles curvature
2. Hydroponics
3. Ptometer
4. Lettuce hypocotyl elongation
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhat 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe typical growth curve in plants is:
2. linear
3. stair-steps shaped
4. parabolic
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyDr. 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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich one of the following growth regulators is known as the stress hormone?
1. Abscisic acid
2. Ethylene
3. GA3
4. Indole acetic acid
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyDuring seed germination its stored food is mobilized by:
1. Cytokinin
2. ABA
3. Gibberellin
4. Ethylene
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. NAA, 2, 4-D
2. GA3
3. Cytokinin
4. IAA, IBA
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThrough 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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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyVernalisation stimulates flowering in:
1. Turmeric
2. Carrot
3. Ginger
4. Zaminkand
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