Question

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

Assertion: The nuclear pores are the passages through which movement of $RNA$ and protein molecules takes place in both directions between the cytoplasm and nucleoplasm.

Reason: Nuclear pores are formed by the fusion of two membranes of the nucleus.

• A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
• B. If both assertion and reason are false.
• C. If both assertion and reason are true but the reason is not the correct explanation of the assertion.
• D. If assertion is true but the reason is false.

Answer 1

The correct option is C If both assertion and reason are true but the reason is not the correct explanation of the assertion.

Assertion

The nuclear pores are the passages through which movement of $RNA$ and protein molecules takes place in both directions between the cytoplasm and nucleoplasm.

Elaboration:

The nuclear pore is a channel in the nuclear envelope that regulates nucleo-cytoplasmic transport. Molecules like proteins and $RNA$ move in both directions between the cytoplasm and nucleoplasm.

Reason

Nuclear pores are formed by the fusion of two membranes of the nucleus.

Elaboration:

There are two membranes of the nucleus- inner and outer nuclear membranes.

The nucleus has pore like structures that facilitate the transport of molecules from cytoplasm to nucleus and vice versa.

Elaboration:

The nuclear membranes (inner and outer nuclear membranes) at these regions are fused to create pores.

However, this fusion is not the reason behind the movement of molecules across the membrane.

Final answer

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