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Define growth. Describe an experiment to measure the rate of growth by Lever (Arc) |
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Answer» Define growth: growth is a permanent irreversible change brought about by an increase in height, weight or volume. Growth curve is a plot of the increase in the height, weight or volume of a plant or its parts against time. In the initial stages, growth is slow and is represented by the lag phase followed by a sudden phase of rapid growth called log phase or exponential growth. The total time during which growth increase is called the grand period of growth a term used by Julius Sachs. This is followed by a decreasing growth rate where a decline in growth is seen and the point at which it occurs is called inflexion point. After this, the growth stops and is called the steady-state or the stationary phase. This portion depends upon the type of plant. The shape of the graph is ‘S’ shaped, so-called the sigmoid growth curve. |
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