Phylum - Coelentrata MCQ Solved Paper for SSC GD

1. If a Hydra is cut into two pieces, it is noted that
A. both parts die
B. both parts make up the loss and form two new individuals
C. both parts live independently as they are
D. none of these
Answer : B

2. Communication between the enteron and exterior in coelentrates is through
A. mouth only
B. mouth and anus
C. large number of pores in the body wall
D. both (b) and (c)
Answer : A

3. A hydranth is
A. Blastostyle of Obelia
B. Gonad of Hydra
C. Medusa of Obelia
D. Polyp of Obelia
Answer : D

4. The mouth opens into a large single cavity in Hydra
A. coelom
B. enterocoel
C. pseudocoel
D. coelenteron
Answer : D

5. Strobilization is the characteristic feature of
A. Aurelia
B. Hydra
C. Metridium
D. Physalia
Answer : A

6. Among coelenterates medusoid individuals are absent in members of the class
A. hydrozoa
B. scyphozoa
C. anthozoa
D. all the three
Answer : C

7. Coelenteron in Hydra serves the purpose of
A. digestion and circulation
B. digestion and storage
C. excretion and digestion
D. circulation and storage
Answer : A

8. Most favourite food of Hydra is
A. bacteria
B. water fleas
C. tadpoles
D. fishes
Answer : B

9. The mesoglea of Hydra contains
A. nerve cells
B. sensory cells
C. muscle fibres
D. no cells
Answer : D

10. The number of tentacles in Hydra is
A. 24
B. 610
C. 1040
D. 4050
Answer : B

11. The larva of Hydra is known as
A. hydrula
B. planula
C. tadpole
D. amphiblastula
Answer : B

12. The mesoglea present in Hydra in between epidermis and gastrodermis is
A. non-cellular and jelly like material
B. cellular jelly like material containing sensory cells
C. cellular jelly like material containing nerve cells
D. both (a) and (c)
Answer : A

13. Polymorphism is best defined as the occurrence of
A. several types of organ-systems in an individual
B. different kinds of larval forms in the life history of an animal
C. different functions performed by a single kind of organism
D. several different types of individuals in a species
Answer : D

14. Division of labour on morphological basis is well exemplified by
A. Hydra
B. Obelia
C. Monkey
D. Elephant
Answer : B

15. A chitinous material is present in the
A. coenosarc of Obelia
B. perisarc of Obelia
C. body wall of Sea anemone
D. umbrella of Aurelia
Answer : B

16. Pueumatophore is present in
A. Tubularia
B. Obelia
C. Hydra
D. Physalia
Answer : D

17. Nematocytes are the specialised cells found in the members of the phylum
A. porifera
B. coelentrata
C. annelida
D. platyhelminthes
Answer : B

18. The first invertebrates to develop a true nervous system are
A. sponges
B. coelenterates
C. annelids
D. arthropods
Answer : B

19. Tentaculocysts in Obelia are meant for
A. locomotion
B. balancing
C. swimming
D. reproduction
Answer : B

20. Hydra reproduces by gemmation (budding) when
A. Plenty of food is present
B. Pond dries up
C. Water becomes muddy
D. Hydra is alone
Answer : A

21. Ctenophores differ form cnidorians in one important aspect, that is
A. absence of musculoepithelial cells in the body wall
B. absence of nematocysts
C. absence of sensory cells
D. absence of sexual reproduction
Answer : B

22. Tentacles of Hydra help in
A. locomotion
B. food capturing
C. locomotion and food capturing
D. respiration
Answer : C

23. Body wall of coelentrates is described as
A. diploblastic
B. integument
C. multicellular
D. triploblastic
Answer : A

24. Six septa or six mesenteries are characteristic of
A. Aurelia
B. Sea anemone
C. Obelia
D. Hydra
Answer : B

25. Nematocysts of Hydra are important for
A. cataching prey
B. paralysing prey
C. testing the food
D./strong> testing the water
Answer : B