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Q. No.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
Subtopic: Growth Hormones & Auxin | Auxin Function |
71%
From NCERT
NEET - 2024
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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 |
Subtopic: Differentiation, Dedifferentiation and Redifferentiation |
74%
From NCERT
NEET - 2024
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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 |
Subtopic: Gibberellin |
84%
From NCERT
NEET - 2024
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NEET 2025 - Target Batch
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Match List-I with List-II
Choose the correct answer from the options given below:
| List-I | List-II | ||
| A. | Ethylene | I. | Increase length of stem |
| B. | Cytokinins | II. | Promotion of senescence and abscission |
| C. | ABA | III. | Delaying leaf senescence |
| D. | Gibberellins | IV. | Inhibition of seed germination |
| 1. | A-III, B-I, C-IV, D-II |
| 2. | A-II, B-III, C-IV, D-I |
| 3. | A-IV, B-II, C-I, D-III |
| 4. | A-III, B-IV, C-I, D-II |
Subtopic: Gibberellin | Cytokinin | Ethylene | Abscisic Acid |
88%
From NCERT
NEET - 2024
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Phytochrome is responsible for
1. Flowering
2. Seed germination
3. Transpiration
4. Both (1) & (2)
1. Flowering
2. Seed germination
3. Transpiration
4. Both (1) & (2)
Subtopic: Growth Hormones & Auxin |
76%
From NCERT
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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
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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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
1. Shortening light period
2. Red light during night
3. Extending dark period
4. Far-red light
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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
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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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
1. Long day plants
2. Short day plants
3. Day-neutral plants
4. All type of plants
From NCERT
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Induction of \(\alpha \text {-amylase }\) activity in barley endosperm is a bioassay of
1. Auxin
2. GA3
3. Cytokinin
4. ABA
1. Auxin
2. GA3
3. Cytokinin
4. ABA
Subtopic: Growth Hormones & Auxin |
53%
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