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

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

1. The phylum Entoprocta is characterized by which of the following features?

• A) Anus located outside the tentacular crown.
• B) Ciliated tentacles surrounding a U-shaped gut.
• C) Both a mouth and an anus opening inside the tentacular crown.
• D) A complete gut with an anus located outside the tentacular crown.

2. What is the common name for organisms belonging to the phylum Entoprocta?

• A) Moss animals
• B) Bryozoans
• C) Goblet worms
• D) Lamp shells

3. Which of the following is a key distinguishing feature of Entoprocta from Ectoprocta?

• A) U-shaped gut.
• B) Presence of a coelom.
• C) Anus opening inside the ring of tentacles.
• D) Sessile lifestyle.

4. The body of an entoproct is divided into a stalk and a:

• A) Lophophore
• B) Calyx
• C) Zooid
• D) Polypide

5. What type of larva is characteristic of marine Entoprocta?

• A) Trochophore larva
• B) Cyphonautes larva
• C) Lophophore larva
• D) Müller's larva

6. The phylum Entoprocta is generally considered to be acoelomate or pseudocoelomate. What type of body cavity do they possess?

• A) A true coelom
• B) A pseudocoel
• C) A hemocoel
• D) A spacious blastocoel filled with mesenchyme

7. Members of the phylum Entoprocta are primarily:

• A) Free-living predators.
• B) Sessile, colonial filter feeders.
• C) Parasitic endosymbionts.
• D) Pelagic and planktonic.

8. Which genus is a well-known example of a freshwater entoproct?

• A) Loxosomella
• B) Barentsia
• C) Pedicellina
• D) Urnatella

9. What is the primary method of asexual reproduction in most entoprocts?

• A) Budding
• B) Fission
• C) Fragmentation
• D) Gemmule formation

10. The nervous system of Entoprocta consists of a single large ganglion located in the:

• A) Tentacular crown
• B) Stalk
• C) Calyx
• D) Pedal gland

11. Entoprocts are generally considered to be which of the following?

• A) Protostomes
• B) Deuterostomes
• C) Acoelomates
• D) Diploblastic

12. Which of the following is responsible for waste excretion in Entoprocta?

• A) Nephridia
• B) Flame cells
• C) Protonephridia
• D) Malpighian tubules

13. The larva of the freshwater entoproct Urnatella is unusual because it lacks a:

• A) Trochophore stage
• B) Ciliated corona
• C) Gut
• D) Mouth

14. Which of the following best describes the gut of an entoproct?

• A) Incomplete, with a single opening.
• B) Straight, with mouth and anus at opposite ends.
• C) U-shaped, with mouth and anus located close to each other.
• D) A sac-like gut with no anus.

15. The phylum Entoprocta is most closely related to:

• A) Rotifera
• B) Annelida
• C) Bryozoa
• D) Platyhelminthes

16. Entoprocts are distinguished from Ectoprocts by the presence of:

• A) A lophophore.
• B) A true coelom.
• C) The anus being located within the tentacular crown.
• D) A chitinous exoskeleton.

17. Which class of Entoprocta is known for having a solitary lifestyle?

• A) Barentsiidae
• B) Pedicellinidae
• C) Loxosomatidae
• D) Urnatellidae

18. The larval stage of an entoproct is free-swimming and characterized by a ring of cilia called the:

• A) Lophophore
• B) Trochus
• C) Protonephridium
• D) Ciliated corona

19. In entoprocts, the nervous system is centered around a single ganglion located between the:

• A) Stalk and calyx
• B) Mouth and anus
• C) Tentacular crown and the gut
• D) Pharynx and stomach

20. Which of the following is true regarding the circulatory system in Entoprocta?

• A) They possess an open circulatory system.
• B) They possess a closed circulatory system.
• C) They have a simple heart and blood vessels.
• D) They lack a specialized circulatory system.

21. The phylum Entoprocta is often placed near which other minor phylum based on molecular studies?

• A) Gnathostomulida
• B) Rotifera
• C) Acanthocephala
• D) Cycliophora

22. What is the function of the pedal gland in some solitary entoprocts?

• A) Digestion
• B) Attachment to the substrate
• C) Reproduction
• D) Locomotion

23. In the life cycle of Loxosomella, the larva undergoes a metamorphosis to become a sessile adult. What is a key feature of this transformation?

• A) The larva develops a true coelom.
• B) The larva inverts, and the ciliated corona becomes the stalk.
• C) The larva secretes a chitinous exoskeleton.
• D) The larva loses its U-shaped gut.

24. The stalk of an entoproct is supported by:

• A) A hydrostatic skeleton
• B) Chitinous spines
• C) A rigid coelomic cavity
• D) A muscular peduncle

25. Which of the following correctly describes the tentacles of an entoproct?

• A) They are solid and non-retractable.
• B) They are ciliated and can be withdrawn into the calyx.
• C) They are used for locomotion.
• D) They are arranged in a spiraled pattern.

26. The phylum Entoprocta belongs to which major group of invertebrates?

• A) Ecdysozoa
• B) Lophophorata
• C) Lophotrochozoa
• D) Deuterostomia

27. Which of the following is an example of a colonial entoproct?

• A) Loxosomella
• B) Barentsia
• C) Pedicellina
• D) Myosoma

28. Entoprocts are typically hermaphroditic, meaning they possess both male and female reproductive organs. What is a common mode of fertilization?

• A) Internal fertilization
• B) External fertilization in the water column
• C) Parthenogenesis
• D) Fragmentation

29. The life cycle of entoprocts often includes a free-swimming larva followed by:

• A) Direct development into an adult
• B) A second larval stage
• C) Metamorphosis into a sessile adult
• D) Encystment

30. The phylum Entoprocta is also known by the name:

• A) Kamptozoa
• B) Endoprocta
• C) Bryozoa
• D) Cycliophora

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