Growth with respect to the following parameter is difficult to measure.
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a
Increase in length of stem or root
b
Increase in number of cells
c
Increase in area of an organ
d
Increase in the amount of protoplasm
answer is D.
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Detailed Solution
Though growth is mainly due to increase in the amount of protoplasm, the protoplasmic increase is not easily measurable. Hence, the other parameters are considered to measure growth.