Q. No.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
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 |
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 |
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 |
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 |
Formation of interfascicular cambium and cork cambium is possible most importantly because of:
| 1. | Differentiation | 2. | Dedifferentiation |
| 3. | Redifferentiation | 4. | Reverse differentiation |
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 |
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 |
© 2025 GoodEd Technologies Pvt. Ltd.