Q. No.The growth in plants can be best expressed as [refer Section 15.2]:
1. Open
2. Determinate
3. Closed
4. Redundant
Development is a term that includes all changes that a plant goes through during its life cycle:
| 1. | till germination of the seed |
| 2. | during its vegetative growth |
| 3. | from germination till flowering |
| 4. | from germination to senescence |
Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called:
| 1. Efficiency index | 2. Plasticity |
| 3. Norm of reaction | 4. Developmental noise |
Difference in shapes of leaves produced in air and those produced in water represents heterophyllous development due to environment in:
| 1. | Cotton | 2. | Coriander |
| 3. | Larkspur | 4. | Butter cup |
Identify the incorrectly matched pair:
| PGR | Chemical nature | |
| 1. | Auxins | Indole compounds |
| 2. | Cytokinin | Pyrimidine derivatives |
| 3. | ABA | Carotenoid derivative |
| 4. | Gibberellic acid | Terpenes |
Identify the plant growth regulator that, though is largely an inhibitor but, can be placed in both plant growth promoter and plant growth inhibitor groups?
| 1. | Auxins | 2. | Gibberellins |
| 3. | Ethylene | 4. | Abscisic acid |
Identify the incorrectly matched pair:
| Scientist | PGR discovery | |
| 1. | Cousins | Ethylene |
| 2. | Kurosawa | Gibberellin |
| 3. | Skoog and Miller | ABA |
| 4. | F. W. Went | Auxin |
Callus from internodal segments of tobacco stem gets proliferated only if in addition to one of the following – extracts of vascular tissues, yeast extract, coconut milk or DNA, the nutrient medium also contains:
| 1. | Auxins | 2. | Gibberellins |
| 3. | ABA | 4. | Ethylene |
Auxin was first isolated from:
| 1. | Coconut milk | 2. | Barley endosperm |
| 3. | Oat coleoptiles | 4. | Human urine |
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 |
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