Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
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).'
What is the primary factor that causes the growth to slow down, leading to a stationary phase in geometric growth?
The NCERT text mentions, 'However, with limited nutrient supply, the growth slows down leading to a stationary phase.'
If you observe a plot of length of an organ against time and obtain a linear curve, what type of growth does it represent?
According to the NCERT, 'On plotting the length of the organ against time, a linear curve is obtained' in arithmetic growth, as shown in Figure 13.5.
Which type of growth is characterized by the ability of both progeny cells to divide after mitotic division, often seen in early embryonic development?
The NCERT states regarding geometric growth: 'Here, both the progeny cells following mitotic cell division retain the ability to divide and continue to do so.' Stages during embryo development often show geometric phases.
In the context of growth rates, 'efficiency index' is another term for which parameter in the exponential growth equation?
The NCERT text clarifies, '$r$ 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.'
Which of the following descriptions accurately defines the term 'taxonomy' according to the provided context?
The NCERT text states: 'The branch of knowledge dealing with these aspects [identification, nomenclature and classification of organisms] is referred to as taxonomy.'
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