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Q. No.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
50%
From 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
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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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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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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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 |
78%
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 |
54%
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Which of the given events does not happen during seed germination?
1. Emergence of radicle
2. Increase in rate of respiration
3. Hydrolysis of stored polysaccharides and proteins
4. Photosynthesis by cotyledons
1. Emergence of radicle
2. Increase in rate of respiration
3. Hydrolysis of stored polysaccharides and proteins
4. Photosynthesis by cotyledons
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Match the following
| Column I | Column II | ||
| a | Auxin | (i) | Root hair formation |
| b | Cytokinin | (ii) | Seed development |
| c | Ethylene | (iii) | Xylem differentiation |
| d | ABA | (iv) | Nutrient mobilisationn |
| 1. | a(iv), b(ii), c(iii), d(i) |
| 2. | a(ii), b(iii), c(i), d(iv) |
| 3. | a(i), b(iii), c(ii), d(iv) |
| 4. | a(iii), b(iv), c(i), d(ii) |
Subtopic: Growth Hormones & Auxin | Cytokinin | Ethylene | Abscisic Acid |
83%
From NCERT
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Select an incorrect match
| 1. | Tryptophan | – | Auxin |
| 2. | Methionine | – | Ethylene |
| 3. | tRNA | – | Cytokinin |
| 4. | Violaxanthin | – | GA3 |
Subtopic: Growth Hormones & Auxin |
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Gibberellin mediates amylase formation during germination of cereal grains is inhibited by
1. Abscisic acid
2. Ethylene
3. Gibberellins
4. Cytokinins
1. Abscisic acid
2. Ethylene
3. Gibberellins
4. Cytokinins
Subtopic: Gibberellin |
61%
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