PHYLUM NEMATHELMINTHES

PHYLUM NEMATHELMINTHES

1. Human beings become infected with Ascaris lumbricoides through

a. Contaminated food, soil and drinking water b. Inhalation of dust

c. Contact with an infected person d. Bite of Aedes mosquito

2. First juvenile larva or simply the larva of Ascaris is-

a. Filiform b. Miracidium c. Microfilaria d. Rhabditiform

3. Which is the correct statement pertaining to Ascaris?

a. A larval stage of Ascaris is swallowed by cattle which in turn infects human beings

b.Once inside host’s intestine, Ascaris larva develops directly into an adult without entering

other organs of the host c. Snail acts as a second host of Ascaris d. Eggs of Ascaris

containing second stage juvenile larvae when swallowed by man become infective

4. In Ascaris, eggs are fertilized in the

a.Vagina b. Oviducts c. Lower parts of uteri d. Seminal vesicles

5. Which one of the following is correct matching of the causative germ and the disease it

causes?

a. Wuchereria bancrofti - Filariasis b. Anopheles maculi pennis - Malaria

c. Leishmania donovani - Sleeping sickness d. Glossian palpalis - Kala azar

6. Give an correct matching of causative agent / germ and disease

a. Anophels — Malaria b. Leishmania — Sleeping Sickness

c. Glossina — Kala - azar d. Wuchereria — Filariasis

7. Infective stage of Ascaris is

a. Adult worm b. Second juvenile c. Fourth juvenile d. Egg

8. Which of the following sense organs is present in Ascaris are chemoreceptorsand located in

anterior part?

a. Pineal spicules b. Pineal setae c. Amphids d. Copulatory Bursa

9. Life span of Ascaris is

a. 6 — 9 months b. 9 — 12 months c. 4 — 10 years d. 10 — 12 years

10. Which one spreads through food contamination

a. Taenia b. Schistosoma c. Ascaros d. Fasciola

11. Which larval stage of Ascaris is infective?

a. First and fourth b. Second and third c. First and second d. Third and fourth

12. In humans elephantiasis is caused by

a. Ascaris lumbricoides b. Dracunculus medinensis

c. Wuchereria bancrofti d. Ancylostoma duodenale

13. Which is secondary / intermediate host of Hookworm?

a. Bed Bug b. Sand fly c. Mosquito d. None of the above

14. Ascaris has three lips

a. One median dorsal and two ventrolateral b. All dorsal

c. Two lateral and one ventral d. Two dorso-lateral and one median ventral

15. Filariasis is caused by

a. Wuchereria b. Culex c. Trichinella d. Schistosoma

16. Embryonated egg of Ascaris represents

a. An egg with a blastula b. An egg with a gastrula c. An egg with an egg

d. An egg with a juvenile

17. Ascaris has a thick cuticle on its body surface, it is an adaptation for

a. Growth b. Parasitism c. Reproduction d. Locomotion

18. Male and female Ascaris respectively have

a. Two testes and two ovaries b. One testis and two ovaries

c. Two testes and one ovary d. One testis and one ovary

19. Which is secondary/intermediate host of hookworm?

a. Bed Bug b. Sand fly c. Mosquito d. None of these

20. Coenocytic ( = syncytial) epidermis is present in

a. Ascaris b. Cockroach c. Earthworm d. Housefly

21. Sexual dimorphism is found in

a. Hydra b. Earthworm c. Ascaris d. Fasciola

22. The lateral lines present in the epidermis of Ascaris have

a. Spermatic ducts b. Excretory ducts c. Oviducts d. Nerves

23. Female Ascaris differes from the male in

a. Having pineal setae b. Curvatur of tail c. Body length d. None of the above

24. Sexual dimorphism is distinct in Ascaris because of

a. Penial setae b. Postanal phasmids c. Buccal margins d. Body colour

25. Salivary glands do not occur in

a.Mosquito b. Housefly c. Cockroach d. Ascaris


ANSWERS

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

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

21. c 22. b 23. c 24. a 25. d