How can growth be measured?

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(D) $\Rightarrow$ At a cellular level,growth is principally a consequence of an increase in the amount of protoplasm.Increase in protoplasm is difficu

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(D) $\Rightarrow$ At a cellular level,growth is principally a consequence of an increase in the amount of protoplasm.Increase in protoplasm is difficult to measure directly; therefore,one generally measures some quantity which is more or less proportional to it.Growth is measured by a variety of parameters,some of which are an increase in fresh weight,dry weight,length,area,volume,and cell number.It is amazing to know that one single maize root apical meristem can give rise to more than $17,500$ new cells per hour,whereas cells in a watermelon may increase in size by up to $3,50,000$ times.In the former case,growth is expressed as an increase in cell number; the latter expresses growth as an increase in the size of the cell.While the growth of a pollen tube is measured in terms of its length,an increase in surface area denotes the growth in a dorsiventral leaf.

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