Q. No.The optimum temperature range for proper growth in most plants is:
1.
\(0^\circ C - 100^\circ C\)
2.
\(15^\circ C - 20^\circ C\)
3.
\(28^\circ C - 30^\circ C\)
4.
Greater than \(45^\circ C\)
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Consider the given diagram and select the correct inference:
| 1. | Both leaves have shown different absolute growths |
| 2. | First leaf has exhibited growth but second leaf has not as it is already senescent |
| 3. | The relative growth of first leaf is more than that of the second leaf |
| 4. | Both leaves have exhibited equal relative growths |
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To differentiate into a tracheary element, a cell would:
1. Gain protoplasm
2. Become multinucleate
3. Assimilate lot of collagen and elastin
4. Develop lignocellulosic secondary cell wall
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Formation of interfascicular cambium and cork cambium is possible most importantly because of:
| 1. | Differentiation | 2. | Dedifferentiation |
| 3. | Redifferentiation | 4. | Reverse differentiation |
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The growth in plants can be best expressed as [refer Section 15.2]:
| 1. Open | 2. Determinate |
| 3. Closed | 4. Redundant |
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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
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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 |
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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 |
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Identify the incorrectly matched pair:
| PGR | Chemical nature | |
| 1. | Auxins | Indole compounds |
| 2. | Cytokinin | Pyrimidine derivatives |
| 3. | ABA | Carotenoid derivative |
| 4. | Gibberellic acid | Terpenes |
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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 |
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