Q14 of 525 Page 237

Why whales arc not grouped in the fishes?

Although whales can swim in water like fishes, but they are not grouped in it because they have characteristic like mammals such as they have four chambered heart, lungs for respiration, diaphragm and mammary glands. They are viviparous like other mammals so they are grouped in the mammals not in the fishes.


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Differentiate the nature of skin in four classes of tetrapoda.

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List a fer'flight adaptations in birds.

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Identify the organism in the following figure


(b) Label the parts numbers 1 to 4.


(c) Name the phylum in which notochord is present.


(d) Name the subphylum in which notochord is present throughout life.

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(a) Identify the organism.

(b) Label the part a1 and 2.


(c) Write the mode the nutrition in this animal.