1000+ Phylum - Coelentrata Multiple Choice Question Answer [Solved]

1. 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

2. In Hydra, the gastrodermis is composed of
A. musculo-epithelial cells
B. musculo-nutritive cells
C. sensory cells
D. cniboblasts
Answer : B

3. Which one is found in Hydra
A. Metabolism
B. Metamerism
C. Melting
D. Metamorphosis
Answer : A

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

5. Nutritionally Hydra is
A. saprozoic
B. herbivorous
C. insectivorous
D. carnivorous
Answer : D

6. Hydra is negatively chemotropic because it
A. prefers weak light
B. moves away from strong light
C. avoids chlorinated water
D. moves to water of low temperature
Answer : C

7. The small green alga that lives inside Hydra is called
A. Zoochlorella
B. Chlamydomonas
C. Euglena
D. None of these
Answer : A

8. Hydra responds to a strong mechanical stimulus such as agitating the surface of water by
A. somersaulting
B. contracting a part or whole of its body
C. walking away
D. looping
Answer : B

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

10. The nematocysts which are mainly used for defense and offense and which tightly coil around the prey are
A. steptoline or atrichous
B. streptoline or holotrichous
C. volvent or desmonemes
D. penetrant or stenoteles
Answer : D

11. 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

12. Which of the following animals has a nervous system but no brain ?
A. Earthworm
B. Hydra
C. Amoeba
D. Cockroach
Answer : B

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

14. The body of Hydra is
A. asymmetrical
B. bilaterally symmetrical
C. radially symmetrical
D. irregular
Answer : C

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

16. Rhopalia are the sense organs in medusa belonging to the class
A. hydrozoa
B. scyphozoa
C. actinozoa
D. all of these
Answer : B

17. "Portuguese Man of War" is the common name for
A. Aurelia
B. Metridium
C. Physalia
D. Tubipora
Answer : C

18. Enteron is divided by mesentries in
A. Aurelia
B. Sea anemone
C. Obelia
D. Hydra
Answer : C

19. 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

20. Cindom is a
A. battery of nematocysts
B. group of nematocysts
C. armed thread
D. none of these
Answer : B

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

22. Hydra is
A. marine, radial, symmetrical and diploblastic
B. fresh water, biradial, symmetrical and triploblastic
C. fresh water, radial, symmetrical and diploblastic
D. marine, radial, symmetrical and triploblastic
Answer : C

23. In Hydra, buds always arise at
A. the hypostome
B. the junction of hypostome and stomach
C. in junction of stomach and stalk
D. the stomach
Answer : C

24. Green Hydra is
A. Hydra vulgaris
B. Chlorohydra viridisma
C. Hydra oligaetis
D. None of these
Answer : B

25. What structures in Hydra functionally correspond to the pseudopodia of Aamoeba ?
A. Endodermal cells
B. Mouth
C. Nematocysts
D. Tentacles
Answer : D

26. Hydra prevents self fertilization by being
A. protogynous
B. hermaphrodite
C. monoecious
D. protandrous
Answer : D

27. 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

28. 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 : A

29. A piece of Hydra will regenerate into a full Hydra if it contains a part of
A. epidermis alone
B. gastrodermis alone
C. both (a) and (b)
D. (a), (b) and tentacles
Answer : A

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

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

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

33. The testes of hydra are located
A. below the ovaries
B. below the tentacles
C. further down the tentacles to occupy central position of the body
D. anywhere on the body between tentacles and adhesive disc
Answer : B

34. 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

35. The tentacles of Hydra are
A. pinnate
B. hollow
C. solid
D. frilled
Answer : B

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

37. 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

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

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

40. Hydra has no special structure for
A. attachment
B. respiration
C. food capturing
D. offense
Answer : B

41. Brain coral is
A. Fungia
B. Hydra
C. Meandria
D. Tubipora
Answer : C

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

43. Ephyra is the larval form of
A. Sea anemone
B. Aurelia
C. Obelia
D. Hydra
Answer : B

44. The scientific name of organ pipe coral is
A. Tubipora
B. Astrangia
C. Meandra
D. Aeropora
Answer : A

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

46. Hydra is put under phylum coelentrata because it has
A. tentacles
B. cnidoblasts
C. hypostome
D. interstitial cells
Answer : B

47. The body wall of Hydra consists of
A. ecotderm and endoderm
B. ectoderm and mesoderm
C. ectoderm, mesoderm and endoderm
D. epidermis, mesoglea and endoderm
Answer : B

48. Polymorphic coelentrates are the members of the class
A. hydrozoa
B. scyphozoa
C. actinozoa
D. all of these
Answer : A

49. Hydra reproduces by budding when
A. plenty of food is present
B. pond is going dry
C. Hydra is alone
D. water becomes muddy
Answer : A

50. Hydra respires through
A. mesoglea
B. general surface
C. pellicle
D. gastrodermis
Answer : B