Class 11th |Zoology Viva-Voce Question Answers

Q1. Which type of symmetry does Pila shows?

Ans. Head and foot shows bilateral symmetry but the visceral mass looses symmetry because of

torsion.

Q2. Which animals show regeneration ?

Ans. Star fish, Planaria.

Q3.What is the scientific name of earthworm and round worm ?

Ans. Earthworm-Pheretima posthuma and roundworm-Ascaris lumbricoides.

Q4. What is the difference between on insect and spider ?

Ans. Insects have three pairs of legs while spider has four pairs of legs.

Q5. Which animals is called as farmer's friend ?

Ans. Earth worm because they make the soil loose by burrowing.

Q6. What does Arthropoda means ?

Ans. Arthropoda (Arthros = jointed, podos = foot), means jointed legs or appendages.

Q7. What is cephalothorax ?

Ans. The structure formed by the fusion of head and thorax is termed as cephalothorax.

Q8. Give the examples of animals which have segmented body ?

Ans. Insects, and earthworms are examples of segmented animals.

Q9. Which phylum is characterized by stringing cells ?

Ans. Members of phylum cnidaria are characterized by stinging cells.

Q10. Which phylum shows a "Tube-with in-a-tube' body plan ?

Ans. Phylum Nematoda.

Q11. How can you differentiate a vertebrate animal from an invertebrate by their morphology ?

Ans. Vertebrates have backbone thus strongly built while invertebrates do not have a backbone

hence are soft bodied.

Q12. How can you differentiate a male frog from a female frog by their morphology?

Ans. Males develop copulatory pad on the first finger of fore limb and have balloon like vocal sacs in

buccal cavity.

Q13. What is the significance of moist skin to the frog?

Ans. It helps in respiration.

Q14. How can you identify a mammal by its external features?

Ans. Mammals have hairy body, pinna and mammary glands.

Q15. Earth worm is a hermaphrodite animal still it show sexual reproduction. Why?

Ans. Earth worm shows sexual reproduction to introduce variations in the progeny for better survival.

Q16. Does Amoeba belong to animal kingdom? Give reasons

Ans. No. According to Whittakers' 5 kingdom classification, the Amoeba belongs to Protista (a

single called eukaryote).

Q17. Give the locomotory organs of the following : (a) Hydra, (b) Amoeba, (c) Paramecium,

(d) Leech

Ans. (a) Tentacles, (6) Pseudopodia, (c) Cilia, (d) Body muscles.

Q18. When does Amoeba develop cyst around it ?

Ans. During encystment under unfavourable condition to protect itself.

Q19. What are Nematocysts?

Ans. Stining cells found in Coelenterates.

Q20. What is the use of nematocysts ?

Ans. Used for protection.

Q21.Seleet the hermaphrodite animal: (i) Fasciola, (ii) Leech, (iii) Taenia

Ans. All (i), (ii) and (iii).

Q22. Birds of bones are hollow. Why

Ans. Bones of birds are hollow and filled with air, so their body weight is less tnat helps in fiying.

Q23. Define autotomy.

Ans.Wnen an enemy approaches the lizard, it cuts off its tail itself. This is called autotomy.

Q24.Why is nictitating membrane found in eye of frogs ?

Ans. The thin nictitating membrane protects the eyes when frogs are in water.

Q25. Give some characters of the class amphibia?

Ans. Characters of class amphibia: (a) skin is thin, moist and naked (without any outgrowth

(b) skin has got mucous glands;

(c)heart is three-chambered

(d)there are four fingers

five toes, there are no claws

(e) metamorphosis in the life Cycle present,

 (f) cold blooded animals.

Q26. What are three basic chordate characters ?

Ans. The three basic chordate characters are : 

(i) presence of notochord

(ii) presence of dorsal

tubular nerve cord, and

(iii)presence f paired gill silts on the sides of pharynx.

Q27 Why are hind limbs longer than fore limbs in frog ?

Ans. Longer hind limbs help in jumping and swimming in water.

Q28. What are the functions of the following: (a) nictitating membrane; (b) web in toes.

Ans. Nictitating membrane protects the eyes in water; web helps in swimming.

                                                                          

Q29.Name a few birds that do not fly.

Ans. Duck, crane, ostrich, penguin etc.

Q30. What is symbiosis ?

Ans. The associationship between two organisms where both are benefitted by the presence of one

another.

Q31. Name any five animals that you see most commonly around.

Ans. Calotes (garden lizard. Columba livia (pigeon), Canis familians (dog), Periplaneta americana

(cockroach), Musca domestica (housefly)

Q32. Name a few egg laying mammals.

Ans. Egg laying mammals belong to the subclass prototheria-Ornithorhyncus (duck-billed platypus

Echidna (scaly-ant eater).