Ncert Exercises & Solutions

Which one of the following sets of animals belong to a single taxonomic group?

1. Cuttlefish, jellyfish, silverfish, dogfish, starfish

2. bat, pigeon, butterfly

3. Monkey, chimpanzee, man

4. Silkworm, tapeworm, earthworm

(c) Monkey, chimpanzee and man belong to a single taxonomic group, i.e., mammals because all of them possess the following characters.

(i) Milk producing mammary glands.
(ii) Two pairs oflimbs.
(iii) Presenceof externalears.
(iv) Viviparity.
(v) Skin possessing hair.

Whereas,

Animal Group

Taxonomic Group

Cuttle fish

Jelly fish

Silver fish

Dogfish

Starfish

Phylum—Mollusca, Class-Cephalopoda,

Phylum-—Cnidaria

Class-Insecta, Order-Thysanura, Phylum-Arthropoda,

Phylum-Chordata, Class—Chondrithyes,

Phylum-Echinodermata, Class—Asteroidea,

Animal Group

Taxonomic Group

Bat

Pigeon

Butterfly

Phylum-Chordata, Class-Mammalia

Phylum-Chordata, Class Aves

Phylum-Arthropoda, Class-Insecta, Order-Lepidoptera

Animal Group

Taxonomic Group

Silkworm

Tapeworm

Earthworm

Phylum-Arthropoda, Class-Insecta, Order-Lepidoptera

Phylum-—Platyhelminthes, Class-Cestoda

Phylum—Annelida, Class—Oligochaeta

Page 60, XI NCERT