Animal Kingdom Chapter-Wise Test 9

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about chordates is correct?

All chordates possess a vertebral column
All chordates have a dorsal, hollow nerve cord
All chordates have paired appendages
All chordates exhibit bilateral symmetry only during the adult stage
2

All chordates possess a dorsal, hollow nerve cord at some stage of their development.

Which of the following animals lacks a respiratory system and performs gas exchange through its body surface?

Frog
Cockroach
Planaria
Pila
3

Planaria, a platyhelminth, lacks a respiratory system and exchanges gases through its moist body surface.

Which of the following statements about cnidarians is correct?

They have a complete digestive system
They are exclusively sessile organisms
They have a nerve net for coordination
They lack specialized stinging cells
3

Cnidarians possess a nerve net, which helps in basic coordination, but they do not have a centralized nervous system.

Which class of vertebrates has a two-chambered heart?

Mammalia
Aves
Amphibia
Pisces
4

Fishes (class Pisces) have a two-chambered heart, consisting of one atrium and one ventricle.

Which of the following statements about hemichordates is incorrect?

They have a body divided into proboscis, collar, and trunk
They have a notochord
They possess an open circulatory system
They are exclusively marine
2

Hemichordates do not have a true notochord; instead, they possess a stomochord, which is similar in function.

Which characteristic feature differentiates Urochordata from Cephalochordata?

Presence of a vertebral column
Notochord is present only in the larval stage of Urochordata
Adults of Cephalochordata exhibit asymmetry
Both groups lack pharyngeal gill slits
2

In Urochordates (e.g., Ascidia), the notochord is present only in the larval stage, whereas in Cephalochordates (e.g., Branchiostoma), it is present throughout life.

Which of the following is a characteristic feature of class Reptilia?

Presence of mammary glands
Dry, cornified skin with epidermal scales
Four-chambered heart in all members
Gills present at some stage of life
2

Reptiles have dry, cornified skin covered with epidermal scales or scutes.

Which of the following characteristics is incorrect regarding amphibians?

They have a dual mode of life, living in water and on land
They possess a three-chambered heart
They lay amniotic eggs
They respire through lungs, skin, and gills at different stages
3

Amphibians lay non-amniotic eggs, usually in water, unlike reptiles, birds, and mammals, which lay amniotic eggs.

Which of the following is a characteristic feature of all chordates?

Presence of vertebrae
Bilateral symmetry
Open circulatory system
Chitinous exoskeleton
2

All chordates exhibit bilateral symmetry, though not all of them develop vertebrae.

Which of the following statements about mammals is incorrect?

They possess mammary glands
They have a three-chambered heart
They are warm-blooded
They have a diaphragm for respiration
2

Mammals have a four-chambered heart, not a three-chambered one.

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