Question

Which are true and false ?
(a) In Torpedo the electric organs are capable of generating strong electric shock to paralyse prey.
(b) Bony fishes use pectoral, pelvic, dorsal, anal and caudal fins in swimming.
(c) Amphibian skin is moist and has thick scales.
(d) Birds are poikilothermic animals.
(e) Mammalian character is milk producing mammary glands for nourishing young ones.

A.a, b and c are true, d and e are false.
B.a, b and e are true, c and d are false.
C.a, d and c are true, b and c are false.
D.Only d is true, a, b, c and e are false.

Answer 1

Hint: A poikilothermic animal has a variable internal body temperature and it changes with the temperature of their surroundings.

Complete answer:
Torpedo are bottom dwelling animals . They are also called electric rays as they have electric organs that can produce electricity and give a shock to their prey. This is their defense and feeding mechanism. Hence, this is true.
Bony fishes have a skeleton made of bone and they form a taxonomic group called Osteichthyes. They use all of their five fins for swimming.
Skin of amphibians is moist so that they can take oxygen through their skin which helps them to breathe. But they do not have scales on their body. Hence, this is not true.
Birds are warm blooded homeothermic animals. They can maintain their constant body temperature. The regulation process is called homeostasis. Hence, this is not true.
The characteristic feature of mammals is to produce milk from the mammary glands to nourish their young ones. Hence, this is true.

Hence, the correct answer is option (B)

Note: Mammary glands are milk producing organs present in mammals. They are regulated by the endocrine system. They are modified sweat glands.