Question

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: The IQ scores of the children of mothers who are exposed to teratogens are found to be low.
Reason R: The use of drugs, alcohol consumption and smoking by mothers lead to central nervous system dysfunction in children.
In the light of the above statements, choose the most appropriate answer from the options given below

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

Hint:

Teratogens target developing organ systems. Because the brain develops throughout the entire pregnancy, it is highly susceptible to teratogens, which often manifests as lower IQ and cognitive impairment.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
The question asks us to evaluate how prenatal exposure to teratogens (such as drugs, alcohol, and nicotine) affects the cognitive development and neurophysiology of children.

Step 2: Detailed Explanation:

• Assertion A states that children born to mothers who were exposed to teratogens during pregnancy often have lower IQ scores. This is a true statement.

• Teratogens are external agents, such as chemicals, viruses, or drugs, that can cross the placental barrier and cause physical or cognitive abnormalities during prenatal development.

• Reason R states that maternal use of drugs, alcohol, and tobacco leads to central nervous system (CNS) dysfunction in developing children. This is also a true statement.

• During pregnancy, the developing brain is highly sensitive to toxins. Alcohol and drugs disrupt neuronal migration, synapse formation, and myelination in the fetal brain.

• This disruption results in structural and functional central nervous system damage (e.g., Fetal Alcohol Spectrum Disorders).

• Because the central nervous system is the biological foundation for all cognitive processes, CNS dysfunction directly leads to lower cognitive capabilities and reduced IQ scores.

• Therefore, Reason R is a direct physiological explanation for the lower IQ scores described in Assertion A.

Step 3: Final Answer:
Both Assertion A and Reason R are correct, and Reason R explains the biological mechanism that causes the outcome described in Assertion A.