NEET Biology Animal Kingdom MCQs Set 17

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Chapter-wise Objective Questions: Animal Kingdom

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Multiple Choice Questions

Question 1: Which type of symmetry is mostly found in sponges?
(a) Radial symmetry
(b) Bilateral symmetry
(c) Asymmetry
(d) Biradial symmetry
Show Answer & Explanation

Answer: (c) Asymmetry

Explanation:
1. Most sponges are irregular and asymmetrical, though some are radial.

Teacher's Note:
1. Sponges are the simplest multicellular animals.

Question 2: The pores through which water enters the body of a sponge and the pore through which it leaves are respectively
(a) osculum and ostia
(b) spongocoel and ostia
(c) ostia and osculum
(d) choanocytes and osculum
Show Answer & Explanation

Answer: (c) ostia and osculum

Explanation:
1. Water enters through many ostia into the spongocoel and exits via the osculum.

Teacher's Note:
1. The canal system helps in food gathering, gas exchange and removal of wastes.

Question 3: Cells that line the spongocoel of sponges are called
(a) cnidoblasts
(b) nematocytes
(c) choanocytes
(d) flame cells
Show Answer & Explanation

Answer: (c) choanocytes

Explanation:
1. Choanocytes or collar cells create the water current and trap food.

Teacher's Note:
1. Cnidoblasts belong to coelenterates.

Question 4: Which of these supports the body of a sponge as skeleton?
(a) Chitin plates
(b) Calcareous scales
(c) Spicules and spongin fibres
(d) Placoid scales
Show Answer & Explanation

Answer: (c) Spicules and spongin fibres

Explanation:
1. Spicules and spongin fibres form the skeleton of sponges.

Teacher's Note:
1. Sponges are hermaphrodite.

Question 5: Animals that have both male and female reproductive organs in the same individual are called
(a) hermaphrodite or bisexual
(b) dioecious
(c) oviparous
(d) viviparous
Show Answer & Explanation

Answer: (a) hermaphrodite or bisexual

Explanation:
1. Sponges, tapeworms and earthworms are bisexual.

Teacher's Note:
1. Separate sexes are called unisexual.

Question 6: Development of an organism through a larval stage is called
(a) direct development
(b) metamorphosis only after birth
(c) indirect development
(d) parthenogenesis
Show Answer & Explanation

Answer: (c) indirect development

Explanation:
1. A larva that differs from the adult is formed, which later changes into the adult.

Teacher's Note:
1. In direct development the young resembles the adult.

Question 7: Stinging cells used by coelenterates for defence and capture of prey are
(a) choanocytes
(b) flame cells
(c) cnidoblasts
(d) nephridia
Show Answer & Explanation

Answer: (c) cnidoblasts

Explanation:
1. Cnidoblasts or cnidocytes contain nematocysts.

Teacher's Note:
1. They are present on tentacles and the body.

Question 8: Portuguese man of war is the common name of
(a) Pennatula
(b) Gorgonia
(c) Adamsia
(d) Physalia
Show Answer & Explanation

Answer: (d) Physalia

Explanation:
1. Physalia is a colonial cnidarian with stinging tentacles.

Teacher's Note:
1. Pennatula is the sea pen and Gorgonia the sea fan.

Question 9: The skeleton of corals is made up of
(a) chitin
(b) silica
(c) spongin
(d) calcium carbonate
Show Answer & Explanation

Answer: (d) calcium carbonate

Explanation:
1. Corals secrete a calcareous skeleton that forms reefs.

Teacher's Note:
1. Meandrina is the brain coral.

Question 10: Comb jellies or sea walnuts belong to phylum
(a) Cnidaria
(b) Porifera
(c) Ctenophora
(d) Echinodermata
Show Answer & Explanation

Answer: (c) Ctenophora

Explanation:
1. Ctenophores have eight external rows of ciliated comb plates for locomotion.

Teacher's Note:
1. They show bioluminescence and are exclusively marine.

Question 11: The property of a living organism to emit light is called
(a) phosphorescence only
(b) photosynthesis
(c) bioluminescence
(d) chemotaxis
Show Answer & Explanation

Answer: (c) bioluminescence

Explanation:
1. Many ctenophores are bioluminescent.

Teacher's Note:
1. It occurs in some marine animals.

Question 12: Phylum Platyhelminthes shows which symmetry and body cavity?
(a) Radial symmetry and coelomate
(b) Bilateral symmetry and pseudocoelomate
(c) Asymmetry and coelomate
(d) Bilateral symmetry and acoelomate
Show Answer & Explanation

Answer: (d) Bilateral symmetry and acoelomate

Explanation:
1. Flatworms are dorso-ventrally flattened, bilaterally symmetrical and acoelomate.

Teacher's Note:
1. Hooks and suckers are present in parasitic flatworms.

Question 13: The pseudocoelomate animals are included in phylum
(a) Aschelminthes
(b) Annelida
(c) Platyhelminthes
(d) Mollusca
Show Answer & Explanation

Answer: (a) Aschelminthes

Explanation:
1. In roundworms the body cavity is not lined by mesoderm completely, so it is a pseudocoelom.

Teacher's Note:
1. Annelids are true coelomates.

Question 14: The body of annelids is divided into segments called
(a) proglottids
(b) metameres
(c) somites of arthropods only
(d) parapodia
Show Answer & Explanation

Answer: (b) metameres

Explanation:
1. This segmentation is called metamerism.

Teacher's Note:
1. Earthworm is an annelid with nephridia.

Question 15: The exoskeleton of arthropods is made of
(a) keratin
(b) cellulose
(c) calcium phosphate
(d) chitin
Show Answer & Explanation

Answer: (d) chitin

Explanation:
1. The chitinous cuticle forms the exoskeleton.

Teacher's Note:
1. Fungal cell walls also contain chitin.

Question 16: The organs of excretion in insects are
(a) Malpighian tubules
(b) nephridia
(c) flame cells
(d) green glands only
Show Answer & Explanation

Answer: (a) Malpighian tubules

Explanation:
1. Malpighian tubules remove nitrogenous wastes from the haemolymph.

Teacher's Note:
1. Statocysts are balancing organs.

Question 17: Silk is produced by which animal, and lac by which?
(a) Bombyx and Laccifer
(b) Apis and Bombyx
(c) Laccifer and Apis
(d) Apis and Laccifer
Show Answer & Explanation

Answer: (a) Bombyx and Laccifer

Explanation:
1. The silkworm Bombyx mori gives silk and Laccifer lacca gives lac.

Teacher's Note:
1. Apis is the honey bee.

Question 18: In molluscs the soft spongy layer of skin over the visceral hump is the
(a) radula
(b) operculum
(c) foot
(d) mantle
Show Answer & Explanation

Answer: (d) mantle

Explanation:
1. The mantle forms a cavity that holds the gills.

Teacher's Note:
1. Radula is the rasping organ.

Question 19: Which phylum has a water vascular system, ventral mouth and dorsal anus?
(a) Mollusca
(b) Annelida
(c) Echinodermata
(d) Hemichordata
Show Answer & Explanation

Answer: (c) Echinodermata

Explanation:
1. In echinoderms tube feet and a water vascular system help locomotion and food capture.

Teacher's Note:
1. Larvae are bilateral and adults radial.

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Animal Kingdom Objective Questions & Solutions for NEET Biology

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