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

1. The nematocysts develop from
A. musculo-epithelial cells
B. interstitial cells
C. digestive cells
D. nerve cell
Answer : B

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

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

4. Musculo-glandular cells are found in hydra
A. on the tentacles
B. on the hypostome
C. on the basal disc
D. in the gastrodermis
Answer : C

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

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

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

8. 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

9. The mesoglea in Hydra is traversed by
A. sensory cells
B. nerve cells
C. interstitial cells
D. all of these
Answer : A

10. A coelentrate, commonly known as fresh water polyp is
A. Hydra
B. Obelia
C. Physalia
D. Acerelia
Answer : A

11. 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

12. Ctenophores generally exhibit
A. bilateral symmetry
B. radial symmetry
C. asymmetry
D. spherical symmetry
Answer : A

13. 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

14. 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

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

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

17. The flagella of food-absorbing cells in hydra aid in
A. stirring up the digestive fluid in the digestive cavity
B. engulfing food particles
C. engulfing semi-digested particles inside food- absorbing cells
D. none of these
Answer : A

18. Coelenteron of Hydra serves the double purpose of
A. digestion and circulation
B. digestion and storage
C. excretion and locomotion
D. circulation and storage
Answer : A

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

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

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

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

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

24. 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

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

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

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

28. Which of the following tissue is absent in Hydra ?
A. Connective tissue
B. Epithelial tissue
C. Muscular tissue
D. Nervous tissue
Answer : A

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

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

31. 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

32. Digestion in Hydra is
A. intracellular
B. extracellular
C. first extracellular, then intracellular
D. first intracellular, then extracellular
Answer : C

33. A Hydra usually possess
A. single testis and many ovaries
B. single ovary and many testes
C. one testis and one ovary
D. many testes and many ovaries
Answer : B

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

35. What is common between Hydra and Obelia ?
A. Both show polymorphism
B. Both possess a larval stage in their life history called planula
C. Both are found in fresh water
D. Both havb a jelly like mesoglea with no cells
Answer : D

36. 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

37. 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

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

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

40. 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

41. 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

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

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

44. In Hydra, the nematocysts are abundant on
A. upper part
B. middle part
C. tentacles
D. lower part
Answer : C

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

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

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

48. 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

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

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