1.

Assertion (A) : Chemical messengers are chemicals that enable communication of message between two neurons or between neurons and muscles. Reason (R) : Chemicals enter the cell through receptor.

Answer»

Assertion and reason both are CORRECT statement but reason does not explain assertion. 
Assertion and reason both are correct and reason explains the assertion. 
Both assertion and reason are wrong statement.
Assertion is correct statement reason is wrong statement.

Solution :Assertion is correct statement reason is wrong statement.
Correct reason : CHEMICALS BIND to the receptors sites present on the surface of the membrane or the CELL. They give MESSAGE to the cell. Without entering the cell.


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