Assertion and Reason
In the following questions a statement of assertion (A) followed by a statement reason (R) is given. Choose the correct answer out of the following choice..
(a) Assertion and reason both are correct statements but reason does not explain assertion.
(b) Assertion and reason both are correct and reason explains asssWon.
(c) Both assertion and reason are Wrong statements.
(d) Assertion is correct statement reason is wrong statement.
(e) Assertion is wrong statement reason is correct statement.
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: (d). The assertion is correct statement reason is the wrong statement.
Correct reason Chemicals bind to the receptor sites present on the surface of the membrance or the cell. They give a message to the cell without entering the cell, but never enter the cell through the receptor.