PHYLUM NEMATODA

PHYLUM NEMATODA

1. Coelomic fluid in earthworm helps it to

a. Keep the skin moist, an essential factor for respiration

b. Support and lubricate the internal organs and with its pressure to act as a hydraulic

skeleton for the animal

c. Destroy the harmful bacteria and other parasites with the help of its chemical substance

and amoeboid cells

d. A ll the above

2. The phenomena of metamerism may be best defined as

a. Where there is equal distribution of structures in all the segments

b. External segmentation corresponds to that of internal segmentation

c. Segmentation not confined to particular region of the body only

d. All the above

3. Adult Nematodes which inhabit lymph vessels and lymph glands are

a. Ascaris b. Wuchereria c. Ancylostoma d. Enterobius

4. The usual vector of Filariasis is

a. Phlebotomus b. Musca c. Anopheles-male d. Female Culex or Aedes

5. Annelids are

a. Triploblastic, bilaterally symmetrical, metamerically segmented, coelomate metazoans.

b. Triploblastic, bilaterally symmetrical, metamerically segmented,

pseudocoelomat metazoans.

c. Triploblastic, bilaterally symmetrical, metamerically segmented, acoelomate metazoans .

d. Triploblastic, radially symmetrical, metamerically segmented, acoelomate metazoans.

6. Dorsal pores in the earthworms are outlets for the

a. Sperms b. Excretory products c. Coelomic fluid d. All the above

7. A body cavity is called a coelom only when it is

a. Mesodermal in origin

b. Lined by parietal and visceral layers of the peritoneum

c. Filled with coelomic fluid

d. All the above

8. Highly contractile dermo muscular body wall is characteristic of

a. Arthropoda b. Nematoda c. Mollusca d. Annelida

9. The origin of the nephridium in Earthworm is mainly

a. Germinal b. Ectodermal c. Mesodermal d. Endodermal

10. The distinctive and unique characteristic by which the phylum Annelida is known because of

a. Presence of a true coelom for the first time b. Occurrence of nephridia as its excretory
organs

c. Metamerization of the body d. Closed circulatory system with lateral hearts

11. Specialised excretory structures of Annelids are

a. Flame cells b. Kidney c. Nephridia d. Coelomic fluid

12. The setal sacs in which the setae are enclosed is also known as

a. Dermal sacs b. Cuticular sacs c. Epidermal sacs d. Setigerous sacs

13. Definite circulatory system with well developed contractile blood vessels and pumping areas

is first established in the phylum

a. Annelida b. Platyhelminthes c. Nematoda d. Arthropoda

14. Sheathed Microfilariae normally circulate at night in the

a. Arteries b. Peripheral blood vessels c. Veins d. Lymph vessels

15. Presence of coelom and metamerism are the most important characters in

a. Helminthes b. Arthropoda c. Annelida d. Coelenterates

16. The.setae of Megascolex are arranged

a. Irregularly b. Dorsally c. Ventrally d. In segmental rows

17. Metamerism first makes its appearance in

a. Cestoda b. Nematoda c. Annelida d. Arthropoda

18. The body cavity of earthworm is

a. True coelom b. Acoelom c. Pseudocoelom d. Haemocoel

19. Clitellum in earthworm is a region of

a. Thickened cuticle b. Many layered epidermal cells c. Mesodermal derivative

d. All the above

20. In earthworm the glandular clitellar region helps in the process of

a. Digestion b. Copulation c. Cocoon formation d. Locomotion

21. Human parasite causing filarlasis is

a. Ascaris lumbricoides b. Enterobius vermicularis c. Wuchereria bancrofti

d. Ancylostoma duodenale

22. The dorsal surface of an earthworm can be easily recognised by

a. Clitellum b. Rows of setae c. Mid dorsal line d. None of these

23. Metamerism in Annelids is

a. Homonomous b. Heteronomous c. Pseudo metamerism d. None of these

24. Clitellum in a typical earthworm occupies .... segments.

a.10 to 14 b. 14 to 17 c. 9 to 13 d. 14 to 19

25. Mucin - a pharyngeal secretion in earthworm is an essential product for moistening the

a. Blood b. Soil c. Animal food d. All the above

26. Lateral hearts are found in

a. Earthworm b. Clam worm c. Leech d. All the above

27. The first true segment of the body in earthworm is called

a. Proboscis b. Head c. Peristomium d. Prostomium

28. The organ or organs of earthworm, which helps the animal in respiration, sensory perception,

locomotion and defence is/are

a. Setae b. Epidermis c. Prostomium d. Cuticle

29. The earthworm body is devoid of

a. Cuticle b. Epidermis c. Setae d. Appendages

30. The function of dorsal pores in earthworm is

a. Respiration b. Elimination of wastes

c. Exudation of coelomic fluids d. Exudation of reproductive products

31. Typhlosole in earthworm is for

a. Mainly respiration b. Exclusively for excretion c. Secretion of digestive enzymes

d. Increasing the ares of absorption

32. The anterior and posterior part of alimentary canal of an earthworm are lined internally by

the

a. Endoderm b. Cuticle c. Mesoderm d. Ectoderm

33. Pulverisation of soil with its food particle occurs in the ... of the earthworm.

a. Pharynx b. Gizzard c. Cacae d. Oesophagus

34. The circulatory system of earthworm is very well developed and consists of

a. Closed system of blood vessels with definite walls

b. Closed system of blood vessels without muscular walls

c. Open system of blood vessels with definite wall

d. Open system of blood vessels without wall

35. In the earthworm, secretion that moisten the soil for grinding in the gizzard is the

a. Mucin secreted by the pharyngeal gland b. Enzymes secreted by the pharyngeal gland

c. Mainly amoeboid cells d. Chloragogen cells

36. In earthworm, a vertical fold hanging from the roof of the intestine within the lumen is called

the

a. Caeca b. Intestinal lamina c. Columnar fold d. Typhlosole

37. The rhythmic movement of food within the gut of earthworm is termed as

a. Cyclosis b. Peristalsis c. Cytolosis d. Metabolism

38. In earthworm, distinct heart is

a. 2 chambered b. 3 chambered c. 4 chambered d. None of these

39. In earthworms, heart-like function of pumping the blood into vessels is mainly done by

a. Ventral vessel b. Lateral vessels c. Dorsal vessel d. None of these

40. Large cells of the visceral peritoneum with yellow granules in earthworm is called the

a. Chloragogen cells b. Mesodermal cells c. Endodermal cells d. All the above

41. The red colour of the blood in earthworm is due to the presence of

a. Red blood coupuscles b. Haemocyanin c. Haemoglobin in plasma d. All the above

42. In earthworm, besides the dorsal pores, the segments carry a large number of minute pores

called the

a. Cuticular pores b. Epidermal pores c. Nephridiopores d. All the above

43. Chloragogen cells are peculiar to

a. Earthworm b. Leech c. Nereis d. All Annelids

44. The type of respiration found in earthworm is

a. Pulmonary b. Cutaneous c. Branchial d. Tracheal

45. .... In earthworm is compared to the vertabrate liver.

a. Salivary glands b. Pharyngeal glands c. Intestinal glands

d. Chloragogen cells

46. Earthworm mainly keeps its body moist with mucous and coelomic fluid mainly to facilitate

a. Locomotion b. Sensory perception c. Respiration d. Excretion

47. Chloragogen cells in the earthworm are connected with

a. Storage and distribution of digested food and synthesis of glycogen and fat

b. Collection and elimination of waste materials

c. Synthesis of ammonia and urea

d. All the above

48. In the alimentary canal of an earthworm, a muscular sac, lined on the inner surface by a hard

chitinous cuticle is the

a. Pharynx b. Caecae c. Gizzard d. Oesophagus

49. The flow of blood in the dorsal vessel of an earthworm is

a. Forward b. Backward c. Irregular d. ‘a’ and ‘b’

50. Conservation of moisture is aided by the

a. Entero-nephric nephridis b. Micronephridia c. Chloragogen cells d. All the above

ANSWERS

1. d 2. d 3. b 4. d 5. a 6. c 7. d 8. d 9. b 10. c

11. a 12. d 13. a 14. b 15. c 16. d 17. c 18. a 19. b 20. c

21. c 22. c 23. a 24. b 25. b 26. a 27. c 28. b 29. d 30. c

31. d 32. b 33. b 34. a 35. a 36. d 37. b 38. d 39. b 40. a

41. c 42. c 43. a 44. b 45. d 46. c 47. d 48. c 49. a 50. a