Give reasons for the following: / State reasons for the following:
Q.1. Give reasons for the following:
(a) Echidna and Platypus lay eggs but are considered as mammals.
(b) Birds have pneumatic bones.
Ans.
(a) Echidna and Platypus lay eggs but are warmblooded and feed their young ones with milk.
(b) To make the body light for flight.
Q.2. State reasons for the following:
(i) Tapeworms do not have digestive tract.
(ii) Frogs have both skin and lungs for breathing.
(iii) Whale is a mammal not a fish.
Ans.
(i) Parasitic, derive digested food from the host.
(ii) Skin to breathe in water, lungs on land.
(iii) Whale is warm-blooded, give birth to young ones, has mammary glands.
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