Question

Read the assertion and reason carefully to mark the correct option in question

Assertion: Specialisation of cells is useful for organism.

Reason: It increases the operational efficiency of an organism.

Answer 1

Elaboration:
In unicellular organism, all the function is performed by a single cell. Thus the operational efficiency is low. Whereas in multicellular organisms, presence of specialised cells, results in division of labour. Thus the operational efficiency increases. Therefore, assertion and reason are true and reason is the correct explanation for the assertion.