Animal Kingdom
Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following phyla is characterized by the absence of a coelom?

Annelida
Arthropoda
Platyhelminthes
Mollusca
3

Platyhelminthes are acoelomates, meaning they lack a body cavity between the body wall and the gut.

Which of the following statements about vertebrates is incorrect?

They have a well-developed notochord throughout life
They possess a closed circulatory system
They exhibit bilateral symmetry
They have a well-developed nervous system
1

In vertebrates, the notochord is replaced by the vertebral column during development.

Which feature is characteristic of phylum Arthropoda?

Radial symmetry
Jointed appendages
Notochord
Flame cells
2

Arthropods are characterized by jointed appendages, which aid in locomotion (NCERT, Chapter 4, page 53). Radial symmetry is in cnidarians, notochord in chordates, and flame cells in platyhelminthes.

Which of the following is a characteristic feature of phylum Mollusca?

Jointed appendages
Radula for feeding
Water vascular system
Metameric segmentation
2

Molluscs possess a radula, a file-like rasping organ used for feeding.

Which of the following is a characteristic feature of phylum Platyhelminthes?

Pseudocoelomate body cavity
Triploblastic and acoelomate
Complete digestive system
Metameric segmentation
2

Platyhelminthes are triploblastic and acoelomate, meaning they lack a true body cavity.

Which type of coelom is present in arthropods?

Acoelomate
Pseudocoelomate
Coelomate
Hemocoelomate
4

Arthropods have a hemocoel, where the body cavity is filled with blood and functions as an open circulatory system.

Which of the following statements about sponges is incorrect?

They have a cellular level of organization
They exhibit external fertilization
They possess a nerve net for coordination
They use choanocytes for filter-feeding
3

Sponges do not possess a nervous system or a nerve net. Their body functions are regulated by the water canal system.

Which of the following animals exhibits radial symmetry in the adult stage?

Ascaris
Starfish
Planaria
Earthworm
2

Starfish, an echinoderm, exhibits radial symmetry in its adult stage, whereas its larval stage shows bilateral symmetry.

Which characteristic feature distinguishes mammals from other vertebrates?

Four-chambered heart
Homoiothermy
Presence of mammary glands
Internal fertilization
3

Mammals are distinguished by the presence of mammary glands, which produce milk for their young.

Which of the following statements about urochordates is incorrect?

They are exclusively marine
The notochord is present throughout life
They undergo metamorphosis
They have a cellulose-like covering called the tunic
2

In urochordates, the notochord is present only in the larval stage, not throughout life.

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