Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin
1. promotes abscission of mature leaves only.
2. does not affect mature monocotyledonous plants.
3. can help in cell division in grasses, to produce growth.
4. promotes apical dominance
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Subtopic: Growth Hormones & Auxin | Auxin Function |
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Formation of interfascicular cambium from fully developed parenchyma cells is an example of
1. Redifferentiation
2. Dedifferentiation
3. Maturation
4. Differentiation
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Subtopic: Differentiation, Dedifferentiation and Redifferentiation |
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Spraying sugarcane crop with which of the following plant growth regulators, increases the length of the stem, thus, increasing the yield?
1. Gibberellin
2. Cytokinin
3. Abscisic acid
4. Auxin
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Subtopic: Gibberellin |
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All given statements are correct w.r.t photoperiodism, except
1. Discovered by Garner and Allard in a variety of tobacco
2. Stimulus is received by young leaves
3. Florigen is the hypothetical hormone produced in response to stimulus
4. Florigen is transported to bud through phloem
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Subtopic: Photoperiodism (OLD NCERT) |
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Hypothetical 'florigen' could be produced prematurely in long-day plants by exposing it to
1. Shortening light period
2. Red light during night
3. Extending dark period
4. Far-red light
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Subtopic: Photoperiodism (OLD NCERT) |
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Which of the following statements does not characterize photoperiodism?
1. Mediated by florigen hormone
2. Conversion of shoot apex into reproductive apex
3. Red light is stimulatory in SDP, LDP and DNP for flowering
4. Photoperiodic stimulus is perceived by mature leaf
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Subtopic: Photoperiodism (OLD NCERT) |
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For flowering, the critical dark period should always be exceeded in
1. Long day plants
2. Short day plants
3. Day-neutral plants
4. All type of plants
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Subtopic: Photoperiodism (OLD NCERT) |
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