All the following contribute to an increase in girth of dicots and gymnosperms except:
1. Apical meristem | 2. Lateral meristems |
3. Vascular cambium | 4. Cork-cambium |
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Identify the incorrect statement regarding the arithmetic growth?
1. Following mitosis, both daughter cells continue to divide
2. Can be exemplified by root elongating at a constant rate
3. On plotting the length of the organ against time, a linear curve is obtained
4. Mathematically it is expressed as
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The shape of the growth curve characteristic of a living organism growing in natural environment is:
1. Linear | 2. Sigmoid |
3. Hyperbola | 4. Bell shaped |
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Plant growth and further development is intimately linked to water status of the plant because:
A. Turgidity of cells helps in extension growth
B. It provides medium for enzymatic activity
1. Both A and B are correct
2. Only A is correct
3. Only B is correct
4. Both A and B are incorrect
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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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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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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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Identify the incorrectly matched pair:
Scientist | PGR discovery | |
1. | Cousins | Ethylene |
2. | Kurosawa | Gibberellin |
3. | Skoog and Miller | ABA |
4. | F. W. Went | Auxin |
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