Question

Which of the following statements are true or false?
(1) In Torpedo the electric organs are capable of generating strong electric shock to paralyze the prey.
(2) Bony fish use pectoral, pelvic, dorsal, anal and caudal fins in swimming.
(3) Amphibians skin is moist with thick scales.
(4) Birds are poikilotherms.
(5) A unique mammalian characteristic is the presence of milk-producing mammary glands by which the young ones are nourished.

• A. 1, 2 and 3 are true, 4 and 5 are false
• B. 1, 2 and 5 are true, 3 and 4 are false
• C. 1, 4 and 5 are true, 2 and 3 are false
• D. 1, 2 and 4 are false, 3 and 5 are true
• E. Only 4 is true, 1, 2, 3 and 5 are false

Answer 1

Answer: (B)

1, 2 and 5 are true, 3 and 4 are false

Torpedo is also known as 'electric ray' for being capable of producing an electric discharge, which is used for defense.

Bony fishes have pectoral, dorsal, anal and caudal fins, which they use for swimming.

Amphibians have moist skin with no fur or scales.

Birds are homeotherms, as they can maintain their body temperature irrespective of external temperature.

Mammals are known for their unique characteristics, one of them is the presence of mammary glands by which young ones are nourished. Hence, option B is correct.