1000+ Phylum - Coelentrata MCQ for GATE [Solved]

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

2. 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

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

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

5. 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

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

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

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

9. 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

10. The poisonous fluid present in the nematocysts of Hydra is
A. toxin
B. venom
C. hypnotoxin
D. haematin
Answer : C

11. 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

12. In Hydra, the absence of circulatory system is fulfilled by
A. ectoderm
B. endoderm
C. mesoglea
D. coelenteron
Answer : D

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

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

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

16. Coral reef formation is mainly related to
A. sponges
B. anthozoans
C. molluscs
D. hydrozoans
Answer : B

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

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

19. 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

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

21. In jelly fishes, the adult is always
A. polypoid
B. medusoid
C. polymorphic
D. hydroid
Answer : B

22. 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

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

24. 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

25. 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

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

27. 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

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

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

30. 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

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

32. 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

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

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

35. 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

36. 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

37. If nematocysts are absent in Hydra, which is affected
A. Locomotion
B. Predation
C. Both (a) and (b)
D. Reproduction
Answer : C

38. 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

39. Polymorphism is found in
A. Hydra
B. Aleyonium
C. Aurelia
D. Physalia
Answer : D

40. In Hydra, the physiological division of labour is exhibited by
A. cellular layers
B. tissues
C. cell differentiation
D. organs
Answer : C

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

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

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

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

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

46. 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

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. 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

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

50. 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