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
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 |
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): | Plants retain the capacity for unlimited growth throughout their life. |
Reason (R): | Plants have meristems at certain locations in their body. |
In the light of the above statements choose the correct answer from the options given below:
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
Formation of interfascicular cambium and cork cambium is possible most importantly because of:
1. | Differentiation | 2. | Dedifferentiation |
3. | Redifferentiation | 4. | Reverse differentiation |
In plants, the living differentiated cells, have lost the capacity of division under certain conditions. This phenomenon is termed as:
1. | Dedifferentiation | 2. | Proto-differentiation |
3. | Redifferentiation | 4. | Secondary differentiation |
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