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Q. No.Auxin was first isolated from:
1.
Coconut milk
2.
Barley endosperm
3.
Oat coleoptiles
4.
Human urine
Subtopic: Growth Hormones & Auxin |
77%
From NCERT
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Auxin does not:
| 1. | Help to initiate rooting in stem cuttings |
| 2. | Promote female flowers in cucumbers |
| 3. | Prevent fruit and leaf drop in early stages |
| 4. | Promote abscission of older mature leaves and fruits |
Subtopic: Growth Hormones & Auxin |
81%
From NCERT
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To extend their market period, fruits can be left on trees longer by the application of:
| 1. | Auxin | 2. | Gibberellins |
| 3. | Cytokinin | 4. | ABA |
Subtopic: Gibberellin |
78%
From NCERT
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Kinetin was first discovered from:
| 1. | Herring sperm DNA | 2. | Coconut milk |
| 3. | Yeast extract | 4. | Corn kernels |
Subtopic: Cytokinin |
80%
From NCERT
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Cytokinins do not help in:
| 1. | Production of new leaves |
| 2. | Lateral shoot growth |
| 3. | Adventitious shoot formation |
| 4. | Promotion of apical dominance |
Subtopic: Growth Hormones & Auxin | Cytokinin |
83%
From NCERT
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Cytokinins help in delay of leaf senescence because they:
| 1. | Promote new leaves formation |
| 2. | Help overcome apical dominance |
| 3. | Help in chloroplast formation in leaves |
| 4. | Promote nutrient mobilization |
Subtopic: Cytokinin |
63%
From NCERT
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Normally, when the seeds are mature, ethylene production increases and builds-up within the fruit, resulting in a climactic event that means:
| 1. | A sudden spurt of growth | 2. | Leaf expansion |
| 3. | Rise in respiratory rate | 4. | Death of radicle |
Subtopic: Ethylene |
88%
From NCERT
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Which PGR is used to initiate flowering and for synchronizing fruit set in pineapple?
| 1. | Cytokinin | 2. | ABA |
| 3. | Ethylene | 4. | GA |
Subtopic: Ethylene |
78%
From NCERT
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Which PGR stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stress?
| 1. | Cytokinin | 2. | Giberrellin |
| 3. | ABA | 4. | Ethylene |
Subtopic: Abscisic Acid |
92%
From NCERT
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In most situations, which PGR acts as an antagonist to GAs?
| 1. | ABA | 2. | Ethylene |
| 3. | Cytokinin | 4. | Giberrellin |
Subtopic: Gibberellin | Abscisic Acid |
85%
From NCERT
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