PG TRB ZOOLOGY | Unit I - ANIMAL DIVERSITY AND PHYLOGENY | Canal systems in Porifera.

PG TRB ZOOLOGY ONLINE TEST / QUIZ AS PER LATEST SYLLABUS | Unit I - ANIMAL DIVERSITY AND PHYLOGENY | Canal systems in Porifera.

1. The simplest type of canal system found in Porifera is:

• Syconoid
• Leuconoid
• Asconoid
• Rhagon

2. In an asconoid canal system, choanocytes line the:

• Incurrent canals
• Radial canals
• Spongocoel
• Excurrent canals

3. The ostia in sponges with a syconoid canal system lead into:

• The spongocoel directly
• The radial canals
• The incurrent canals
• The excurrent canals

4. Which of the following is an example of a sponge with an asconoid canal system?

• Leucosolenia
• Sycon
• Euspongia
• Clathrina

5. The most complex and efficient canal system is the:

• Asconoid
• Syconoid
• Leuconoid
• Rhagon

6. In a leuconoid canal system, choanocytes are restricted to:

• The spongocoel
• The radial canals
• The flagellated chambers
• The incurrent canals

7. The flow of water in a syconoid sponge is:

• Ostia → Incurrent canals → Prosopyles → Radial canals → Apopyles → Spongocoel → Osculum
• Ostia → Spongocoel → Osculum
• Osculum → Spongocoel → Ostia
• Incurrent canals → Spongocoel → Radial canals → Osculum

8. The prosopyles connect the incurrent canals to the:

• Spongocoel
• Excurrent canals
• Radial canals
• Osculum

9. Which of the following is not a characteristic of the leuconoid canal system?

• Spongocoel is completely obliterated or reduced
• Choanocytes line the flagellated chambers
• Radial canals are lined by choanocytes
• Increased surface area for food collection

10. The apopyles connect the radial canals to the:

• Incurrent canals
• Spongocoel
• Osculum
• Flagellated chambers

11. A sponge with a syconoid canal system is typically an example of the class:

• Calcarea
• Hexactinellida
• Demospongiae
• Sclerospongiae

12. The osculum is a single large opening in sponges for the exit of water, which is a key feature in the:

• Ostia
• Porocytes
• Incurrent canals
• Canal system

13. Water enters the spongocoel directly from the external environment in which type of canal system?

• Asconoid
• Syconoid
• Leuconoid
• Both b and c

14. The flagellated chambers in the leuconoid canal system are connected to the excurrent canals by:

• Prosopyles
• Apopyles
• Ostia
• Porocytes

15. The increased number of flagellated chambers in the leuconoid type leads to:

• Faster water flow
• Increased efficiency in food gathering
• Reduced body size
• Simpler body plan

16. The canal system in sponges is primarily responsible for:

• Locomotion
• Reproduction
• Feeding, respiration, and excretion
• Protection

17. Which of the following statements is true about the Rhagon canal system?

• It is a modified asconoid type
• It has a conical shape with a broad base
• It is found in adult calcareous sponges
• The spongocoel is very large and prominent

18. The water current in a sponge is generated by the beating of flagella of the:

• Pinacocytes
• Amoebocytes
• Choanocytes
• Scleroblasts

19. In a syconoid sponge, the choanocytes line the:

• Spongocoel
• Incurrent canals
• Excurrent canals
• Radial canals

20. The ostia are also known as:

• Excurrent pores
• Incurrent pores
• Oscula
• Apopyles

21. The leuconoid canal system is characteristic of most members of the class:

• Calcarea
• Hexactinellida
• Demospongiae
• Both b and c

22. Which of the following sponges shows the highest level of complexity in its canal system?

• Leucosolenia
• Sycon
• Euplectella
• Euspongia

23. In the Ascon type of canal system, the body wall is:

• Thin and simple
• Thick and folded
• Thick with flagellated chambers
• Composed of multiple layers

24. The transformation of a sponge from an asconoid to a syconoid structure is a form of:

• Body folding
• Cell differentiation
• Metamorphosis
• Mesoglea thickening

25. The pores that open from the radial canals into the spongocoel in Sycon are called:

• Prosopyles
• Apopyles
• Ostia
• Osculum

26. In the Rhagon type of canal system, the flagellated chambers are directly connected to the:

• Subdermal spaces
• Excurrent canals
• Incurrent canals
• Spongocoel

27. Which of the following is an example of a sponge with a syconoid canal system?

• Spongilla
• Sycon
• Cliona
• Euspongia

28. The canal system in sponges serves a function similar to the ________ in higher animals.

• Respiratory system
• Excretory system
• Circulatory system
• All of the above

29. The flow of water in the leuconoid canal system is characterized by:

• A single, central spongocoel
• A faster water current compared to syconoid
• A reduced number of flagellated chambers
• A highly branched system of incurrent and excurrent canals

30. Which structure is responsible for the exit of water from the spongocoel?

• Ostia
• Porocytes
• Osculum
• Apopyles

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