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Q. No.Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called plasticity
1. True
2. False
1. True
2. False
Subtopic: Development |
94%
Level 1: 80%+
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Subtopic: Growth Hormones & Auxin |
66%
Level 2: 60%+
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Auxins like NAA (naphthalene acetic acid) and 2, 4-D (2, 4- dichlorophenoxyacetic) have been isolated from plants
1. True
2. False
1. True
2. False
Subtopic: Growth Hormones & Auxin |
70%
Level 2: 60%+
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Subtopic: Growth Hormones & Auxin | Cytokinin |
83%
Level 1: 80%+
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Subtopic: Ethylene |
95%
Level 1: 80%+
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Apical dominance in a growing shoot is best explained by which integrated hormonal mechanism?
1. Basipetal transport of auxin suppressing lateral bud growth by reducing cytokinin action.
2. Acropetal transport of cytokinin promoting auxin synthesis in axillary buds.
3. Uniform distribution of gibberellins stimulating equal growth of all buds.
4. Local accumulation of ethylene inhibiting elongation of the main apex.
1. Basipetal transport of auxin suppressing lateral bud growth by reducing cytokinin action.
2. Acropetal transport of cytokinin promoting auxin synthesis in axillary buds.
3. Uniform distribution of gibberellins stimulating equal growth of all buds.
4. Local accumulation of ethylene inhibiting elongation of the main apex.
Subtopic: Growth Hormones & Auxin |
79%
Level 2: 60%+
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Which plant hormone is chemically classified as a terpene derivative?
1. Indole-3-acetic acid which promotes cell elongation and growth
2. Zeatin which promotes cell division and delays senescence
3. Abscisic acid which induces dormancy and stomatal closure
4. Ethylene which promotes fruit ripening and abscission
1. Indole-3-acetic acid which promotes cell elongation and growth
2. Zeatin which promotes cell division and delays senescence
3. Abscisic acid which induces dormancy and stomatal closure
4. Ethylene which promotes fruit ripening and abscission
Subtopic: Growth Hormones & Auxin |
Level 4: Below 35%
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The phenomenon where roots grow toward water is termed:
1. Hydrotropism which is a positive growth response to moisture gradient
2. Geotropism which is a positive growth response to gravitational pull
3. Chemotropism which is a growth response to chemical stimuli
4. Thigmotropism which is a growth response to touch stimuli
1. Hydrotropism which is a positive growth response to moisture gradient
2. Geotropism which is a positive growth response to gravitational pull
3. Chemotropism which is a growth response to chemical stimuli
4. Thigmotropism which is a growth response to touch stimuli
Subtopic: Growth |
77%
Level 2: 60%+
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Gibberellins promote:
| 1. | Cell division in meristems |
| 2. | Fruit ripening in plants |
| 3. | Root initiation in cuttings |
| 4. | Stem elongation in plants |
Subtopic: Gibberellin |
85%
Level 1: 80%+
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Abscisic acid is called stress hormone because it:
| 1. | Induces closure of stomata |
| 2. | Promotes growth during drought |
| 3. | Increases cell division rate |
| 4. | Stimulates seed germination rapidly |
Subtopic: Abscisic Acid |
93%
Level 1: 80%+
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