Practice free Growth and Development in Plants (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following is not a natural mean to remove seed coat?
Page number-253
15.7 Seed Dormancy
Plant Growth and Development
The callus is defined as
The callus is defined as undifferentiated mass of cells.
Which of the following describes arithmetic growth in plants?
According to the NCERT text, 'In arithmetic growth, following mitotic cell division, only one daughter cell continues to divide while the other differentiates and matures.'
The mathematical expression for arithmetic growth is given by $L_t = L_0 + rt$. What does '$r$' represent in this equation?
The NCERT text explicitly states, '$r$ = growth rate / elongation per unit time' for the arithmetic growth equation.
Which of the following scenarios is NOT characteristic of geometric growth?
The NCERT text states that 'The simplest expression of arithmetic growth is exemplified by a root elongating at a constant rate.' Geometric growth, in contrast, involves both progeny cells dividing and typically follows a sigmoid curve.
What is the significance of the '$r$' in the exponential growth formula $W_1 = W_0 e^{rt}$?
As per the NCERT text, 'Here, $r$ is the relative growth rate and is also the measure of the ability of the plant to produce new plant material, referred to as efficiency index.'
A typical sigmoid growth curve is generally obtained when plotting the parameter of growth against time for:
The NCERT states, 'If we plot the parameter of growth against time, we get a typical sigmoid or S-curve (Figure 13.6). A sigmoid curve is a characteristic of living organism growing in a natural environment.'
Consider two leaves, A and B, where leaf A grows from 5 $cm^2$ to 10 $cm^2$ and leaf B grows from 50 $cm^2$ to 55 $cm^2$ in the same amount of time. Which leaf exhibits a higher relative growth rate?
Relative growth rate is the growth per unit time expressed on a common basis, e.g., per unit initial parameter. For Leaf A, the increase is 5 $cm^2$ from 5 $cm^2$ (100% increase). For Leaf B, the increase is 5 $cm^2$ from 50 $cm^2$ (10% increase). Therefore, Leaf A has a much higher relative growth rate.
Which of the following is an example of arithmetic growth?
The NCERT text explicitly uses, 'A root elongating at a constant rate' as an example of arithmetic growth.
In geometric growth, what phase precedes the 'log or exponential phase'?
The NCERT states, 'In most systems, the initial growth is slow (lag phase), and it increases rapidly thereafter – at an exponential rate (log or exponential phase).'
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