Growth at cellular level is the increase in the amount of
a)	Cell wall	b)	Cell membrane	c)	Protoplasm	d)	All of the above

(c)

Growth, at cellular level, is principally a consequence of increase in the amount of protoplasm. Since, increase in protoplasm is difficult to measure directly, one generally measures some quantity which is more or less proportional to it. Growth is, therefore, measured by a variety of parameters some of which are; increase in fresh weight, dry weight, length, area, volume and cell number