Animal Kingdom Chapter-Wise Test 23

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about cyclostomes is incorrect?

They lack jaws
They have paired fins
They are ectoparasites
They have a cartilaginous endoskeleton
2

Cyclostomes (e.g., lampreys and hagfish) lack paired fins, unlike most vertebrates.

Which of the following groups has a closed circulatory system?

Arthropods
Molluscs
Annelids
Echinoderms
3

Annelids have a closed circulatory system with blood confined to vessels.

Which of the following statements about cnidarians is incorrect?

Cnidarians exhibit radial symmetry
Cnidarians have cnidoblasts for defense and capturing prey
Cnidarians possess a complete digestive system with mouth and anus
Cnidarians can exist in both polyp and medusa forms
3

Cnidarians have an incomplete digestive system with a single opening serving as both mouth and anus.

Which of the following is an example of a hermaphroditic animal?

Frog
Cockroach
Earthworm
Pigeon
3

Earthworms are hermaphroditic, meaning they possess both male and female reproductive organs.

Which of the following statements about birds is incorrect?

They are oviparous
They have a diaphragm for respiration
They have a four-chambered heart
They have lightweight, pneumatic bones
2

Birds do not have a diaphragm; instead, they use air sacs to assist in respiration.

Which of the following features is incorrect regarding birds?

They are poikilothermic
They have a four-chambered heart
They possess pneumatic bones
They lack a urinary bladder
1

Birds are homeothermic (warm-blooded), not poikilothermic (cold-blooded).

Why are hemichordates considered an intermediate group between non-chordates and chordates?

They possess a true vertebral column
They have a stomochord, functionally similar to a notochord
They show a complete digestive system like arthropods
They exhibit radial symmetry as adults
2

Hemichordates possess a stomochord in the collar region, which is similar in function to the notochord but structurally different. This places them between non-chordates and chordates.

Which of the following animals possesses flame cells for excretion?

Earthworm
Planaria
Cockroach
Octopus
2

Planaria (a platyhelminth) uses flame cells for osmoregulation and excretion.

Which of the following animals belongs to class Amphibia?

Calotes
Rana
Naja
Columba
2

Rana (frog) belongs to class Amphibia, characterized by its ability to live both on land and in water.

Which phylum exhibits both intracellular and extracellular digestion?

Porifera
Cnidaria
Platyhelminthes
Arthropoda
2

Cnidarians digest food partially in the gastrovascular cavity (extracellular digestion), and further digestion occurs inside cells (intracellular digestion).

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