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
Subtopic: Ā Growth |Ā Growth Model |Ā Growth Terminology |
Ā 80%
From NCERT
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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 Lt=L0+rt
Subtopic: Ā Growth |Ā Growth Terminology |
Ā 78%
From NCERT
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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
Subtopic: Ā Growth Terminology |
Ā 90%
From NCERT
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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

Subtopic: Ā Growth |Ā Growth Terminology |
Ā 88%
From NCERT
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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
Subtopic: Ā Growth Terminology |Ā Development |
Ā 95%
From NCERT
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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.
Subtopic: Ā Growth |
Ā 86%
From NCERT
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The exponential growth in plants can be expressed as: W1 = W0ert where ‘e’ denotes:
1. Initial size at the beginning of the period
2. base of natural logarithms
3. growth rate/elongation per unit time
4. time of growth
Subtopic: Ā Growth Model |
Ā 92%
From NCERT
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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
Subtopic: Ā Differentiation, Dedifferentiation and Redifferentiation |
Ā 80%
From NCERT
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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
Subtopic: Ā Differentiation, Dedifferentiation and Redifferentiation |
Ā 55%
From NCERT
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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

Subtopic: Ā Development |Ā Differentiation, Dedifferentiation and Redifferentiation |
Ā 81%
From NCERT
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