Question

Given below are two statements: one is labelled as Assertion (A) and the other as Reason (R). Assertion (A): When readymade antibodies are directly given to protect the body against foreign agents, it is called passive immunity. Reason (R): The yellowish fluid colostrum secreted by mother contains antibodies (IgA) to protect the infant. Choose the correct answer from the options given below:

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true but R is not the correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Hint:

Types of immunity: \[ \text{Active Immunity} = \text{Body produces its own antibodies} \] \[ \text{Passive Immunity} = \text{Ready-made antibodies are received} \] Examples of passive immunity: \[ \text{Colostrum (IgA)} \] \[ \text{Maternal antibodies through placenta} \] \[ \text{Antiserum injections} \]

Answer 1

The Correct Option is B

Step 1: Examine Assertion (A). Passive immunity is obtained when preformed antibodies are transferred to an individual. Examples include:
• Antiserum injections
• Maternal antibodies transferred to the baby Therefore, \[ \boxed{\text{Assertion (A) is true}} \]

Step 2: Examine Reason (R). Colostrum is the yellowish first milk produced by the mother after childbirth. It contains: \[ \boxed{\text{IgA antibodies}} \] which provide protection to the newborn against infections. Therefore, \[ \boxed{\text{Reason (R) is true}} \]

Step 3: Check whether R explains A. Reason (R) describes one example of passive immunity, namely maternal transfer of antibodies through colostrum. However, it does not explain the definition of passive immunity given in Assertion (A). Thus, \[ \boxed{\text{R is not the correct explanation of A}} \] Therefore, \[ \boxed{\text{Both A and R are true but R is not the correct explanation of A}} \] Hence, the correct answer is: \[ \boxed{\text{(B)}} \]