Amphibians inhabit both water and land. These ectothermic animals thrive in warmer climates. The body of members belonging to class amphibia is segregated into head and trunk while the tail may or may not be found. The heart is three-chambered and the kidney is mesonephric. Eg., Salamanders, Frogs. Explore objective questions on class amphibia, important for NEET preparation below:
1. Dicondylic skull along with ten pairs of cranial nerves is found in
(a) Mammalia
(b) Amphibia
(c) Reptilia
(d) Pisces
Answer: (b)
2. This about Class Amphibia is correct
(i) fertilization is internal
(ii) respiration is through gills only
(iii) body is divisible into head and trunk
(iv) heart is two chambered – one ventricle and one auricle
(a) only (i)
(b) only (iii)
(c) (i), (ii) and (iv)
(d) all are correct
Answer: (b)
3. A frog has
(a) jaws but no teeth
(b) eyes but no lids
(c) ears but no pinnae
(d) hands but no fingers
Answer: (c)
4. Even after attaining sexual maturity, larval characters are retained. It is known as
(a) Phylogenesis
(b) Neoteny
(c) Parthenogenesis
(d) Ontogenesis
Answer: (b)
5. Frogs dwell in water or in the vicinity of water as
(a) it respires through the skin
(b) it can see through its transparent eyelids whilst swimming
(c) its hindlimbs are webbed, facilitating to swim
(d) water is a good source for food
Answer: (a)
6. In amphibians, Organ of Jacobson is for
(a) temperature
(b) pressure
(c) smell
(d) sound
Answer: (c)
7. The differentiating factor of the venous system of frog and rabbit is in the presence of this
(a) hepatic vein
(b) three vena cavae
(c) renal portal system
(d) hepatic portal system
Answer: (c)
8. Neck is not found in a frog. This absence helps the frog to
(a) swim in water
(b) respire
(c) catch prey
(d) jump on ground
Answer: (d)
9. The body temperature of a frog is 20 degrees celsius in an environment having a temperature of 30 degrees celsius. The temperature of the frog in the new environment is
(a) 25 degrees celsius
(b) 20 degrees celsius
(c) 30 degrees celsius
(d) between 20-30 degrees celsius
Answer: (c)
10. This is not a true amphibian animal
(a) Toad
(b) Salamander
(c) Tortoise
(d) Frog
Answer: (c)
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