NEET · Biology · STD 12 - 2. human reproduction

Find the correct statement :
(A) In human pregnancy, the major organ systems are formed at the end of 12 weeks.
(B) In human pregnancy the major organ systems are formed at the end of 8 weeks.
(C) In human pregnancy heart is formed after one month of gestation.
(D) In human pregnancy, limbs and digits develop by the end of second month.
(E) In human pregnancy the appearance of hair is usually observed in the fifth month.

Choose the correct answer from the options given below :

A A and E only
B \(B\) and C only
C \(B, C, D\) and \(E\) only
D A, C, D and E only

Verified Solution

Answer & Solution

Correct Answer

(D) A, C, D and E only

Step-by-step Solution

Detailed explanation

In a human female's pregnancy.
- By the end of 12 weeks ( \(1^{\text {st }}\) trimester), most of major organ systems are formed (not by end of 8 weeks).
- After one month of pregnancy, the embryo's heart is formed.
- By the end of second month of pregnancy, the foetus develops limbs and digits.
- The first movements of foetus and appearance of hair on head are usually observed during the fifth month.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Column \(-I\)	Column \(-II\)
\((A)\) Gonorrhoea	\((i)\) HIV
\((B)\) Syphilis	\((ii)\) Neisseria
\((C)\) Genital warts	\((iii)\) Treponema
\((D)\) AIDS	\((iv)\) Human papilloma virus