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Assertion : The constantly dividing cell...

Assertion : The constantly dividing cells both at the root apex and the shoot apex, show the meristematic phase of growth.
Reason : The cells of this region are rich in protoplasm and are without nuclei.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
c
The root apex, shoot apex and many other regions have meristematic tissue. New cells are produced by mitotic divisions of the meristematic cells. These cells have cellulosic cells walls, large nucleus and rich in protoplasm. It is called the phase of cell formation or cell division.
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Assertion (A) : Growth is measurable. Reason ( R) : At a cellular level, growth simply means in the amount of protoplasm. One single maize root apical meristem can give rise to more than 17,500 new cells / hour, it is in terms of increase in cell number and cells in the watermelon can increase in size upto 3,50,000, here growth is measured in terms of size of the cells. Therefore Growth is measured in terms of increase in cell number, area, volume, lenght etc.