EasyNEET TEST
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The growth of pollen tube is measured in terms of increase in:
A
length.
B
cell size.
C
cell number.
D
surface area.
Explanation
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 upto 3,50,000 times. In the former, growth is expressed as increase in cell number; the latter expresses growth as increase in 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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