Phylum Porifera Multiple Choice Questions
1. Phylum Porifera’s diversity consists of major groups.
A. 2
B. 3
C. 4
D. 5
Answer: B
2. Which one of the following groups of Porifera is primarily shallow water and tropical.
A. Calcarea
B. Hexactinellida
C. Demospongia
D. none
Answer: A
3. The group of Porifera considered as “glass sponges” is.
A. Calcarea
B. Hexactinellida
C. Demospongia
D. none
Answer: B
4. Siliceous 6-rayed spicules are usually found in Demospongiae.
A. yes
B. no
Answer: B
5. The group of Porifera having siliceous 6-rayed spicules are.
A. Calcarea
B. Hexactinellida
C. Demospongia
D. none
Answer: B
6. Phylum Porifera consists of simple multicellular and colonial animals.
A. yes
B. no
Answers: A
7. Phylum Porifera includes all sessile suspension feeders.
A. yes
B. no
Answers: A
8. Skeletal elements of Phylum Porifera’s animals consist of.
A. Calcium carbonate
B. Silicon dioxide
C. Mucopolysaccharide
D. a and b both
Answer: D
9. The main large exit found in Phylum Porifera’s members is called.
A. Phorocyte
B. Ostia
C. Osculum
D. none
Answer: C
10. Phylum Porifera considered to be planted until.
a. 1868
b. 1794
c. 1996
d. 1765
Answer: D
11. The function of amoebocytes:
A. Store food
B. Transport wastes
C. Control of flow rate
D. All
Answer: D
12._____ provide water current by beating its flagellum:
A. Amoebocytes
B. Choanocytes
C. Pinacocytes
D. None
Answer: B
13. Key type cells are called:
A. Pinacocytes
B. Choanocytes
C. Amoebocytes
D. Myocytes
Answer: B
14. Amoebocytes are highly mobile:
A. Yes
B. No
Answer: A
15. Pinacocytes cover inside and line pores:
A. Yes
B. No
Answer: B
16. The main matrix of the sponge is called:
A. Mesohyl
B. Spicules
C. Osculum
D. Ostia
Answer: A
17. The main matrix of the sponge is stiffened by spicules composed of:
A. Calcium carbonate
B. Magnesium phosphate
C. Calcium phosphate
D. Calcium carbonate or silicon dioxide
Answer: D
18. The main chamber which is lined with choanocytes:
A. Ascon
B. Sycon
C. Leucon
D. None
Answer: A
19. Leucon has multiple layers of choanocytes chamber:
A. Yes
B. No
Answer: A
20. Choanocytes captures and show extracellular digestion:
A. Yes
B. No
Answer: B
21. In the structural conditions of sponges, leucon has
A. One main chamber of choanocyte
B. Two chambers of choanocyte
C. Multiple layers of choanocytes chambers
D. None of these
Answer: C
22. In the food capturing by choanocytes, beating of flagellum creates ________ inside collar.
A. Negative pressure.
B. Positive pressure
C. Has no effect produce inside collar
D. May be positive may be negative
Answer: A
23. In Phylum Porifera, the beating of the flagellum draws food to the outside of the mucus-covered _____ of the collar.
A. Villi
B. Microvilli
C. Food vacuole
D. None of these
Answer: B
24. Size of Amoebocytes is Phylum Porifera is 2-5µm
A. YES
B. NO
Answer: A
25. Size of Choanocytes collar is 5-50µm.
A. YES
B. NO
Answer: B
26. Food captured by Choanocytes is moved via ________
A. Flagella
B. Cilia
C. both A and B
D. None of these
Answer: A
27. In Porifera, Ostia is an opening through which ____________
A. Waters enters into the sponges
B. Water leaves the sponges
C. It is a series of small openings
D. Both A and C
Answer: A
28. Ostia has size _______
A. ~5-70 micrometre
B. ~5-80 micrometre
C. ~6-78 micrometre
D. ~5-50 micrometre
Answer: D
29. In Porifera, members have key cell types mainly are Choanocytes.
A. YES
B. NO
Answer: A
30. In the aquiferous system of Porifera’sbeating of the flagellum is coordinated.
A. YES
B. NO
Answer: B
31. In Porifera, Gametes are released via
A. Ostia
B. Osculum
C. Both
D. None
ANSWER: B
32. In Porifera, sperms enter choanocytes and lose ____ .
A. Digits
B. Tail
C. Hands
D. Feet
ANSWER: B
33. In Porifera the larvae released with flagellated cells on _____
A. Outside
B. Inside
C. Laterally
D. Ventrally
Answer: A
34. Upon settlement in Porifera flagellated cells move from outside to inside via invagination
A. Yes
B. No
Answer: A
35. Some sponges toxins are useful for humans
A. yes
B. No
Answer: A
36. Sponges are protected by
A. spicules
B. camouflage
C. regenerative ability
D. All
Answer: D
37. Sponges are over-harvested in
A. France
B. Spain
C. Greece
D. Japan
Answer: C
38. Sponges have toxic _____ metabolites within spherulous cells.
A. primary
B. secondary
C. primary and secondary
D. none
Answer: B
39. Newly developed pinacoderms derived from micromere
A. Yes
B. No
ANSWER: B
40. In sponges both egg and sperm are spawned in the water column
A. Yes
B. No
Answers: A
41. In sponges, dissolved carbon dioxide is swept out the osculum via
A. Diffusion
B. Water currents
C. Vesicles
D. Sense organs
Answer: B
42. By touching some sponges close off Ostia via
A. Osculum
B. Filaments
C. Myocytes
D. both A and B
Answer: C
43. Excretory material in sponges is
A. Ammonia
B. Urea
C. Uric Acid
D. Water
Answer: A
44. _____ contract and pull sponges along
A. Antennae
B. Filament
C. Ostia
D. Water currents
Answer: B
45. Archaeocytes migrate out through the _____ to reconstruct sponges during asexual reproduction.
A. Gemmule
B. Micropyle
C. Spicule
D. Filament
Answer. B
46. In sponges, Choanocytes or amoebocytes are transformed into
A. Spermatogonia
B. Spermatocytes
C. Oocytes
D. both A and b
Answer: C
47. In the sponges nervous system is not present.
A. Yes
B. No
Answer: A
48. Most sponges are protandrous or protogynous Hermaphrodite.
A. Yes
B. No
Answer: A
49. In sponges’ cells communicate mechanically only.
A. Yes
B. No
Answer: B
50. Amoebocytes in sponges are highly mobile.
A. Yes
B. No
Answer: A