NEET · Biology · STD 11 - 4. Animal kingdom

Which of the following animals is not vivipa rous?

A Platypus
B Whale
C Flying fox (Bat)
D Elephant

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Answer & Solution

Correct Answer

(A) Platypus

Step-by-step Solution

Detailed explanation

(a) : Duck billed platypus is an egg laying mammal. It is found in the rivers in eastern Australia and Tasmania. It is a beaver like monotreme about \(50- 60\ cm\) long and well adapted to live in water. Usually, two eggs are laid at a time. The female curls around them for incubation and remains inactive for about two weeks. Newly hatched young ones are very immature, naked, blind and each is \(2.5\ cm\) long.

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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Match the following columns and select the correct option.

Column\(-I\)	Column\(-II\)
\((a)\) Placenta	\((i)\) Androgens
\((b)\) Zona pellucida	\((ii)\) Human Chorionic Gonadotropin \((hCG)\)
\((c)\) Bulbo\(-\)urethral glands	\((iii)\) Layer of the ovum
\((d)\) Leydig cells	\((iv)\) Lubrication of the Penis

\((a)\quad(b)\quad(c)\quad(d)\)

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