Sharks and dogfishes differ from skates and rays by

Solution

Sharks and dogfishes have cylindrical body while skates and rays have flattened body with wing like pectoral fins which are not distinct from body.

Which one of the following groups of animals reproduces only by sexual means?

Solution

In Ctenophora, sexes are not separate. Reproduction takes place only by sexual means.In Cnidaria, which exist in both forms, polyps produce medusae a sexually and medusae form the polyps sexually. Porifera(sponge)reproduce asexually by fragmentation and sexually by formation of gametes. Protozoans come under protista which reproduce asexually and sexually by cell fusion and zygote formation.

Which one of the following animals is correctly matched with its one characteristics and the taxon?

Animal	Characteristic	Taxon
Millipede	Ventral nerve cord	Arachnida

Animal	Characteristic	Taxon
Sea Anemone	Triploblastic	Cnidaria

Animal	Characteristic	Taxon
Silverfish	Pectoral and Pelvicfins	Chordata

Solution

Duckbilled platypus is oviparous and comes under phylum mammalia. Millipede belongs to the phylum arthropoda. Sea-anemone is diploblastic belongs to phylum cnidaria. Silver-fish is an insect belongs to phylum arthropoda, having long antennae, no wings and move in a wiggling motion that resembles the movement of a fish.

The characteristics of class Reptilia are :

Body covered with dry and cornifield skin, scales over the body are epidermal, they do not have external ears
Body covered with moist skin which is devoid of scales,the ear is represented by a tympanum, alimentary canal,urinary and reproductive tracts open into a common cloaca
Fresh water animals with bony endoskeleton, air-blad-der to regulate buoyancy
Marine animals with cartilaginous endoskeleton, body covered with placoid scales

Solution

In option (a) all the characteristics belong to class Rep-tilia.In options (b), (c)and (d) the characteristics belong to the classes Amphibia, Osteichthyes and Chondrichthyes respectively.

One of the representatives of phylum Arthropoda is :

Solution

Representive of Phylum Arthropoda is silverfish. Arthropoda is the largest phylum of Animalia, which covers two-thirds of all named species.

Which of the following are correctly matched with respect to their taxonomic classification?

Match the name of the animal (column I), with one characteristics (column II), and the phylum/class (column III) to which it belongs :

Column I Column II Column III

Ichthyophis terrestrial Reptilia
Column I Column II Column III

Limulus body covered by chitinous exoskeleton Pisces
Column I Column II Column III

Adamsia radially symmetrical Porifera
Column I Column II Column III

Petromyzon ectoparasite Cyclostomata

Column I	Column II	Column III
Ichthyophis	terrestrial	Reptilia

Column I	Column II	Column III
Limulus	body covered by chitinous exoskeleton	Pisces

Column I	Column II	Column III
Adamsia	radially symmetrical	Porifera

Column I	Column II	Column III
Petromyzon	ectoparasite	Cyclostomata

Which group of animals belong to the same phylum?

Solution

Prawn , Scorpion and Locusta belong to phylum Arthropoda. This is the largest phylum of Animalia,over two-thirds of all named species on earth are Arthropoda. Phylum is named so due to presence of jointed appendages (arthros = jointed, poda = append-ages) in body of members of this phylum.

Heart is three – chambered in reptiles, exception is –

In amphibians, heart is ___________ chambered.

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Ichthyophis	Amphibian
Limulus	Arthropoda
Adamsia	Cnidaria
Petramyzon	Jawless vertebrate & ectoparasite,cyclostomate