Animal Kingdom Chapter-Wise Test 6

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about fishes is correct?

All fishes have external fertilization
Cartilaginous fishes lack an operculum
All fishes possess a swim bladder
Bony fishes have a cartilaginous endoskeleton
2

Cartilaginous fishes (Chondrichthyes) **lack an operculum** and instead have **gill slits** for respiration.

Which animal belongs to class Osteichthyes?

Pristis
Trygon
Labeo
Scoliodon
3

Labeo (Rohu) belongs to class Osteichthyes, which includes bony fishes.

Which phylum includes animals with an open circulatory system and hemocoel?

Annelida
Arthropoda
Chordata
Platyhelminthes
2

Arthropods have an open circulatory system where blood flows into a hemocoel instead of being confined to vessels.

Which of the following statements about bony fishes (Osteichthyes) is incorrect?

They have a bony endoskeleton
They possess an operculum
They lack a swim bladder
They have a two-chambered heart
3

Bony fishes **have a swim bladder**, which helps them regulate buoyancy.

Which phylum is characterized by animals with a body wall containing ostia and a spongocoel?

Cnidaria
Porifera
Platyhelminthes
Annelida
2

Members of phylum Porifera (sponges) have a body wall with ostia (tiny pores) leading to the spongocoel, allowing water circulation.

Which feature in birds enhances flight efficiency?

Three-chambered heart
Pneumatic bones
Scaly skin
Mammary glands
2

Pneumatic (hollow) bones in birds reduce body weight, enhancing flight efficiency (NCERT, Chapter 4, page 58). Birds have a four-chambered heart, scaly skin is in reptiles, and mammary glands are in mammals.

Which of the following statements about nematodes is correct?

They have a pseudocoelom
They exhibit radial symmetry
They have a segmented body
They are exclusively free-living organisms
1

Nematodes are **pseudocoelomates**, meaning they have a body cavity that is not completely lined by mesoderm.

Which phylum does the organism Balanoglossus belong to?

Echinodermata
Hemichordata
Chordata
Cnidaria
2

Balanoglossus belongs to phylum Hemichordata, a group of marine worm-like animals.

Which feature is common to both amphibians and reptiles?

Warm-blooded nature
Poikilothermic nature
Mammary glands
Feathers
2

Both amphibians and reptiles are poikilothermic (cold-blooded), meaning their body temperature varies with the environment (NCERT, Chapter 4, page 58). Warm-bloodedness is specific to birds and mammals, mammary glands to mammals, and feathers to birds.

Which of the following features distinguishes deuterostomes from protostomes?

Blastopore develops into the mouth in deuterostomes
Radial and indeterminate cleavage in deuterostomes
Mesoderm forms by schizocoely in deuterostomes
Protostomes include Echinodermata and Chordata
2

Deuterostomes exhibit radial and indeterminate cleavage, and their blastopore develops into the anus. Protostomes show spiral and determinate cleavage.

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