| A. | Amphibia | (i) | Air bladder |
| B. | Mammals | (ii) | Cartilaginous notochord |
| C. | Chondrichthyes | (iii) | Mammary glands |
| D. | Osteichthyes | (iv) | Pneumatic bones |
| E. | Cyclostomata | (V) | Dual habitat |
| F. | Aves | (vi) | Sucking and circular mouth with out jaws. |
Answer:
A.
(v) B. (iii) C. (ii) D. (i) E. (vi) F. (iv)
a. Amphibians
possess dual habitat ,i.e., they are found in both aquatic and terrestrial habitat.
Their larva is completely aquatic and adult lives in terrestrial as well as
inaquatic habitat
b. Mammals
have mammary glands which produce milk and feed their young ones. The mammary
glands are enlarged exocrine modified sweat glands functional in female mammals.
c.
Chondrichthyes have the cartilaginous rod (notochord) in the young stage which
is gradually replaced by cartilage.
d.
Osteichthyes have air bladder which is a vesicle or sac containing air,
e.
Cyclostomes possess sucking and circular mouth without jaws which is surrounded
by tentacles and the tongue bears teeth, e.g., lamprey and nag fish.
f. Aves have
light weighted bones with internal spaces filled with air called pneumatic bones
and aerodynamic lungs with specialized air sacs. These are the adaptations which
enable birds to fly.
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