Question

Match the following mammals in List-I with their correct characteristics in List-II.

List - I	List - II
(P) Platypus	(1) Marsupial mammal
(Q) Kangaroo	(2) Placental mammal
(R) Blue whale	(3) Egg laying mammal
(S) Koala	(4) Pouch bearing mammal

Choose the correct option.

• A. \(P \rightarrow 3,\ Q \rightarrow 4,\ R \rightarrow 2,\ S \rightarrow 1\)
• B. \(P \rightarrow 1,\ Q \rightarrow 3,\ R \rightarrow 2,\ S \rightarrow 4\)
• C. \(P \rightarrow 3,\ Q \rightarrow 1,\ R \rightarrow 4,\ S \rightarrow 2\)
• D. \(P \rightarrow 2,\ Q \rightarrow 1,\ R \rightarrow 3,\ S \rightarrow 4\)

Hint:

Classification of mammals:
• Monotremes \(\rightarrow\) egg laying mammals
• Marsupials \(\rightarrow\) pouch bearing mammals
• Eutherians \(\rightarrow\) placental mammals

Answer 1

The Correct Option is A

Concept: Mammals are broadly classified into:
• monotremes
• marsupials
• placental mammals These groups differ in reproductive strategy and embryonic development.

Step 1: Identifying Platypus. Platypus:
• belongs to monotremes
• lays eggs Hence: \[ P \rightarrow 3 \]

Step 2: Identifying Kangaroo. Kangaroo:
• possesses a marsupium (pouch)
• gives birth to immature young ones Hence: \[ Q \rightarrow 4 \]

Step 3: Identifying Blue whale. Blue whale:
• is a eutherian mammal
• possesses placenta Hence: \[ R \rightarrow 2 \]

Step 4: Identifying Koala. Koala is a marsupial mammal. Hence: \[ S \rightarrow 1 \] Final matching. \[ P \rightarrow 3,\quad Q \rightarrow 4,\quad R \rightarrow 2,\quad S \rightarrow 1 \] Hence option (A) is correct. Final Answer: \[ \boxed{(A)} \]