PG TRB ZOOLOGY ONLINE TEST / QUIZ AS PER LATEST SYLLABUS | Unit I - ANIMAL DIVERSITY AND PHYLOGENY |Structure, affinities and life history of Minor Phyla – Siphunculida.

PG TRB ZOOLOGY ONLINE TEST / QUIZ AS PER LATEST SYLLABUS | Unit I - ANIMAL DIVERSITY AND PHYLOGENY |Structure, affinities and life history of Minor Phyla – Siphunculida.

1. The coelomic cavity of Siphunculids is a true schizocoel, but it lacks:

A. Mesenteries and metamerism B. Coelomic fluid and protonephridia C. Coelomic epithelium and haemocoel D. All of the above

2. Siphunculids are commonly known as:

A. Peanut worms B. Acorn worms C. Arrow worms D. Ribbon worms

3. The anterior retractable part of the Siphunculid body is called the:

A. Introvert B. Trunk C. Head D. Proboscis

4. The coelomic fluid of Siphunculids contains special cells called:

A. Erythrocytes B. Hemocytes C. Urn cells D. Phagocytes

5. The nervous system of Siphunculids is most similar to that of:

A. Annelida B. Mollusca C. Arthropoda D. Echinodermata

6. The larval stage of Siphunculids is a free-swimming form known as:

A. Planula larva B. Bipinnaria larva C. Trochophore larva D. Veliger larva

7. The primary function of the introvert in Siphunculids is:

A. Locomotion B. Feeding and gas exchange C. Reproduction D. Defense

8. Siphunculids primarily reproduce by:

A. Budding B. Fission C. Sexual reproduction with external fertilization D. Parthenogenesis

9. What is the typical habitat of most Siphunculids?

A. Freshwater lakes B. Terrestrial environments C. Marine benthic habitats D. Pelagic zones

10. The excretory organs of Siphunculids are a pair of metanephridia, which open to the exterior through a nephridiopore located near the:

A. Anus B. Mouth C. Brain D. Tentacles

11. A unique structure found in the coelomic fluid of Sipunculids, which helps in waste collection, is:

A. Amoebocytes B. Coelomocytes C. Urn cells D. Blood cells

12. The affinities of Siphunculids are debated, but they are most often considered to be closely related to:

A. Annelids and Molluscs B. Cnidarians and Ctenophores C. Nematodes and Rotifers D. Echinoderms and Chordates

13. The phylum Siphunculida is characterized by the absence of a true circulatory system and a prominent:

A. Nervous system B. Respiratory system C. Segmented body D. Digestive tract

14. The tentacles surrounding the mouth in Siphunculids are primarily used for:

A. Sensory perception B. Reproduction C. Gas exchange and food collection D. Defense

15. The coelom of a Siphunculid is considered to be:

A. A pseudocoel B. An enterocoel C. A schizocoel D. A haemocoel

16. The life cycle of many Siphunculids includes a characteristic larval stage that resembles the trochophore larva of:

A. Annelida and Mollusca B. Platyhelminthes and Nematoda C. Arthropoda and Echinodermata D. Cnidaria and Porifera

17. Which of the following is a distinguishing feature of Siphunculida compared to Annelida?

A. The presence of a closed circulatory system B. The absence of segmentation C. The presence of a true coelom D. The presence of a hydrostatic skeleton

18. The digestive tract of Siphunculids is a coiled tube, which begins at the mouth and ends at the anus located:

A. At the posterior end of the trunk B. Near the base of the introvert C. On the introvert itself D. On a specialized posterior appendage

19. The process of introverting and everting the proboscis (introvert) is achieved by:

A. Muscular contractions and coelomic fluid pressure B. Ciliary action C. Special tentacular muscles D. A combination of muscular and glandular action

20. In Siphunculids, the "nephridia" are responsible for:

A. Respiration and osmoregulation B. Reproduction and waste removal C. Excretion and osmoregulation D. Digestion and absorption

21. The main difference between the larval stage of Siphunculids and Annelids is that the Siphunculid larva:

A. Lacks a digestive system B. Lacks a nervous system C. Does not undergo segmentation D. Has a distinct head region

22. Which of the following is NOT a feature of the Siphunculida phylum?

A. U-shaped digestive tract B. Coelomic sacs filled with fluid C. A closed circulatory system D. The presence of an introvert

23. The body wall of Siphunculids is composed of:

A. A thin cuticle, epidermis, and circular muscles B. A thick cuticle, mesoderm, and longitudinal muscles C. An epidermis, a dermis, and a single layer of muscle D. A cuticle, epidermis, and both circular and longitudinal muscles

24. What is the fate of the introvert during feeding in Siphunculids?

A. It is completely retracted into the trunk B. It is everted and extended for collecting food C. It remains stationary, and the tentacles move D. It is shed and regrown periodically

25. The trochophore larva of Siphunculids develops into a juvenile through a process of:

A. Direct development B. Metamorphosis C. Fission D. Budding

26. A key feature suggesting a relationship between Siphunculida and Annelida is:

A. The presence of a well-developed head B. The formation of a schizocoelic coelom C. The possession of a similar circulatory system D. The presence of chaetae

27. The large coelomic cavity of Siphunculids acts as a:

A. Respiratory organ B. Digestive organ C. Hydrostatic skeleton D. Excretory organ

28. The brain of a Siphunculid is a circumenteric ring located around the:

A. Anus B. Pharynx C. Gizzard D. Intestine

29. The life cycle of a Siphunculid typically includes:

A. A single larval stage followed by direct development B. A trochophore larva that develops into a pelagosphaera larva C. A veliger larva that metamorphoses into a juvenile D. A direct developmental pathway with no larval stage

30. What is the function of the Polian vesicles and the compensating sacs in Siphunculids?

A. Excretion B. Osmoregulation C. Storage of coelomic fluid and hydrostatic movement D. Sensory reception

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