Plant Growth and Development — Flashcards

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Growth means irreversible quantitative change in the size of a cell, organ, or whole plant. Differentiation means qualitative differences between cells, tissues, and organs. Growth is about increase i…

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Open form of growth is the type of growth in which new cells keep being added to the plant body by the activity of meristems throughout life. This is why plants can continue growing for a very long ti…

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Growth is measured by changes in length, diameter, volume, dry weight, fresh weight, area, or cell number. Common methods include direct measurement with a scale, a horizontal microscope, an arc auxan…

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Pfeffer's auxanometer records growth automatically on a smoked drum. It is used to measure growth rate by tracing the movement of a pointer as the plant grows.

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Arithmetic growth: L_t = L_0 + rt. Here, L_t = length at time 't', L_0 = length at time 'zero', and r = growth rate or elongation per unit time. This shows constant linear growth.

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Geometric growth: w_1 = w_0 e^(rt). Here, w_1 = final size, w_0 = initial size, r = growth rate, t = time of growth, and e = base of natural logarithms. This type of growth shows a sigmoid pattern in …

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Absolute Growth Rate, or AGR, is the total growth of a plant or organ per unit time. Its formula is AGR = dw/dt, where dw is the increase in weight and dt is the change in time.

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Relative Growth Rate, or RGR, is growth per unit time expressed per unit of weight or volume. Its formula is RGR = (dw/dt) × (1/w_0), where w_0 is the initial weight. AGR gives total increase, while R…