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201.

Which one of the following groups of animals is bilaterally symmetrical and triploblastic?(a) Aschelminthes (round worms) (b) Ctenophores (c) Sponges (d) Coelenterates (cnidarians)

Answer»

(a) Aschelminthes (round worms)

202.

Distinguish between Diploblastic animals and triploblastic animals.

Answer»

Diploblastic animals: 

  • The animals in which the cells are arranged in two embryonic layers, the ectoderm and endoderm are called diploblastic animals. 
  • These are lower organisms, e.g. Cnidaria and ctenophora

Triploblastic animals: 

  • The animals in which the cells are arranged in three embryonic layers, the ectoderm, mesoderm and endoderm are called triploblastic animals.
  • These are higher organisms, e.g. Platyhelminthes to mammalia.
203.

Blood worms are the larvae of ………….(a) Hirudinaria (b) Chironomus (c) Limulus (d) Daphnia

Answer»

(b) Chironomus

204.

Distinguish between asexual reproduction and sexual reproduction.

Answer»

Asexual Reproduction: 

  • The reproduction without involvement of gametes is called Asexual Reproduction. 
  • Zygote is not formed.

Sexual Reproduction:

  • The reproduction with the involvement of gametes is called sexual reproduction. 
  • Zygote is formed by the process called fertilization.
205.

Which of the following cell type is capable of giving rise to other ccli types in sponges? (a) Pinacocytes (b) Archaeocytes (c) Thesocytes (d) Collencytes

Answer»

(b) Archaeocytes

206.

Name the following:Pores on the body of sponges through which the water enters.

Answer»

Body surface: 

Their body bears minute pores called ‘ostia’ through which water enters the spongocoel (body cavity). Water leaves the body through a large opening called ‘osculum’. Beating of flagella creates water current.

207.

Name the larvae of sponges.

Answer»

Parenchymula and amphiblastula.

208.

Which is not correct for sponges? (a) Internal fertilization (b) External fertilization (c) Gemmule formation (d) Gametes are formed from epidemial cells.

Answer»

(b) External fertilization

209.

Radiata include (a) Diploblastic and bilaterally symmetrical animals (b) Triploblastic and radially symmetrical animals(c) Diploblastic and radially symmetrical animals (d) Triploblastic and bilaterally symmetrical animals

Answer»

(c) Diploblastic and radially symmetrical animals.

210.

Pneumatic bones are seen in – (a) Mammalia (b) Aves (c) Reptilia (d) Sponges

Answer»

Correct Answer is: (b) Aves

211.

Duck-billed platypus is a connecting link between ………….(a) Reptile and bird (b) Living and non-living (c) Reptile and mammal (d) Echinodermata and chordate

Answer»

(c) Reptile and mammal

212.

Distinguish between polyp and medusa.

Answer»

Polyp: 

  • The sessile body form of cnidarians is called polyp. 
  • It is the asexual generation

Medusa: 

  • The free living body form of cnidarians is called medusa. 
  • It is the asexual generation
213.

Polyp phase is absent in …………(a) Physalia (b) Obselia (c) Hydra(d) Aurelia

Answer»

Polyp phase is absent in Aurelia.

214.

The minute pores on the body of sponges are called (a) oseuliem (b) ostia (c) choanocytes (d) spongocoel

Answer»

The minute pores on the body of sponges are called ostia.

215.

Which of the following statements is correct? (a) Polyp forms are free-living (b) Medusa forms are sessile (c) Medusa produces gametes(d) Polyp reproduces sexually

Answer»

(c) Medusa produces gametes

216.

Harversian systems are found in the bones of ………….(a) Pigeon (b) Panther (c) Pipe fish (d) Python

Answer»

Correct answer is : (b) Panther

217.

Turtles are ………… (a) Pisces (b) Reptiles (c) Molluscans (d) Arthropods

Answer»

(b) Reptiles

218.

Which of the following is the adaptation of flatworms for the endoparasitic mode of life? (a) They are dorsoventrally flattened (b) They have hooks, suckers or both (c) Their body is not segmented (d) They reproduce sexually

Answer»

(b) They have hooks, suckers or both

219.

Which is the class of animals adapted for dual mode of life? (a) Pisces (b) Amphibia (c) Reptilia (d) Mammalia

Answer»

(b) Amphibia

220.

Which of the following animals possesses ink gland?(a) Blue Whale (b) Scorpion (c) Sea Urchin (d) Cuttle Fish

Answer»

(d) Cuttle Fish

221.

Crab and Snail both have a protective covering. Is it made up of the same material?

Answer»

No, the protective covering is not made up of same material in crab and snail. The protective covering of crabs is made up of chitin and that of snails is made up of calcium carbonate.

222.

Which of the following is not correctly paired? (a) Humans – Ureotelic (b) Birds – Uricotelic (c) Lizards – Uncotelic (d) Whale – Ammonotelic

Answer»

(d) Whale – Ammonotelic

223.

Sponge and sea star show calcareous protective material. Do they belong to the same Phylum?

Answer»

No, they do not belong to same phylum. Sponges belong to phylum Porifera and sea star belongs to phylum Echinodermata. 

1. Adult echinoderms are radially symmetrical but larval forms are bilaterally symmetrical. 

2. Larvae of echinoderms are free-swimming.

224.

Which of the following is correctly matched?(a) Physalia – Portugese man of war (b) Pennatula – Sea fan (c) Adamsia – Sea pen (d) Gorgonia – Sea anemone

Answer»

(a) Physalla – Portugese man of war

225.

Why are spongin and spicutes important to a sponge?

Answer»

Spongin and spicules provide support and supports the soft body parts of the sponges. The spicules give the sponges rigidity and form to the sponges

226.

What are the four characteristics common to most animals?

Answer»

The characteristics common to most animals are the arrangement of cell layers.

  • The levels of organization.
  • Nature of coelom.
  • The presence or absence of segmentation and notochord.
  • Organization of the organ system.
227.

The limbless amphibian is – (a) Icthyophis (b) Hyla (c) Rana (d) Salamander

Answer»

(a) Icthyophis