Practice free Growth and Development in Plants (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
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 characteristics are typical of cells in the meristematic phase of growth?
The NCERT text states: 'The constantly dividing cells... represent the meristematic phase of growth. The cells in this region are rich in protoplasm, possess large conspicuous nuclei. Their cell walls are primary in nature, thin and cellulosic with abundant plasmodesmatal connections.'
The phase of growth characterized by increased vacuolation, cell enlargement, and new cell wall deposition is the:
According to the NCERT text, 'The cells proximal (just next, away from the tip) to the meristematic zone represent the phase of elongation. Increased vacuolation, cell enlargement and new cell wall deposition are the characteristics of the cells in this phase.'
In which phase of growth do plant cells attain their maximal size, exhibit extensive wall thickening, and undergo significant protoplasmic modifications?
The NCERT text specifies: 'Further away from the apex, i.e., more proximal to the phase of elongation, lies the portion of axis which is undergoing the phase of maturation. The cells of this zone, attain their maximal size in terms of wall thickening and protoplasmic modifications.'
Which of the following statements is INCORRECT regarding the phases of growth in plants?
The NCERT text states that 'Increased vacuolation, cell enlargement and new cell wall deposition are the characteristics of the cells in this [elongation] phase.' Significant protoplasmic modifications and maximal size are characteristic of the maturation phase, not the elongation phase.
Root apical meristem contributes primarily to:
The context mentions that 'root apical meristem... are responsible for the primary growth of the plants and principally contribute to the elongation of the plants along their axis.'
Which of the following represents the correct sequence of growth phases, starting from the tip of a root?
The NCERT text describes the sequence from the tip: 'The constantly dividing cells... represent the meristematic phase... The cells proximal (just next, away from the tip) to the meristematic zone represent the phase of elongation. Further away from the apex, i.e., more proximal to the phase of elongation, lies the portion of axis which is undergoing the phase of maturation.' Thus, the order is Meristematic → Elongation → Maturation.
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