Animal Kingdom Chapter-Wise Test 18

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which phylum is characterized by the presence of a mantle and a shell?

Annelida
Mollusca
Arthropoda
Hemichordata
2

Molluscs have a body covered by a calcareous shell and a mantle that secretes the shell.

Which of the following statements about hemichordates is incorrect?

They have a body divided into proboscis, collar, and trunk
They possess a true notochord
They are marine, worm-like organisms
They have an open circulatory system
2

Hemichordates have a stomochord, which is similar in function but not homologous to the notochord.

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

Annelida
Arthropoda
Aschelminthes
Echinodermata
3

Aschelminthes (roundworms) have a pseudocoelom, a body cavity not lined entirely by mesoderm.

Which phylum consists of animals with a segmented body and nephridia for excretion?

Mollusca
Arthropoda
Annelida
Platyhelminthes
3

Annelids have a segmented body and use nephridia for excretion and osmoregulation.

Which of the following animals belongs to the phylum Hemichordata?

Balanoglossus
Ascaris
Pheretima
Octopus
1

Balanoglossus is a hemichordate, characterized by a proboscis, collar, and trunk.

Which of the following statements about cartilaginous fishes is correct?

They have a bony endoskeleton
They have an operculum over the gills
They lack a swim bladder
They use external fertilization
3

Cartilaginous fishes lack a swim bladder, which is present in bony fishes.

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

Ascaris
Sycon
Hydra
Earthworm
3

Hydra, a cnidarian, is diploblastic, meaning its body develops from two germ layers: ectoderm and endoderm.

Which of the following animals possesses a water vascular system?

Ascaris
Asterias
Limulus
Octopus
2

Asterias (starfish) has a water vascular system, which is a unique feature of phylum Echinodermata.

Which excretory organ is present in Annelida?

Malpighian tubules
Nephridia
Flame cells
Green glands
2

Nephridia are the excretory organs in annelids, helping in osmoregulation and waste removal.

Which of the following features is a synapomorphy of Chordata?

Presence of jointed appendages
Body segmentation
Pharyngeal gill slits
Exoskeleton of chitin
3

Pharyngeal gill slits are a defining characteristic of chordates, present in some stage of their development.

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