33. Assertion : The number of cells in a multicellular organism is inversely proportional to the size of body. Reason : All the cells in the biological world are of same size.

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

(b)       If both the assertion and reason are true but the reason is not a correct explanation of the assertion 

(c)        If the assertion is true but the reason is false

(d)       If both the assertion and reason are false

(e)       If the assertion is false but reason is true

Ans.  (d)      Number of cells in a multicelluar organism are directly proportional to the size of the body. On the other hand, it is a fact that cell vary greatly in their size. Mycoplasma cells are the smallest, ranging from 0.1 to 0.3µm, whereas human cells, generally range from 20 to 30µm. Nerve cells are the longest.