Fossil Practical II - The Sponges
15 Questions
| Total Attempts: 73
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Questions and Answers
- 1.Containing 6-ray silica spicules and forming beautiful glass skeletons of SiO2, the "glass" sponges are in what class of sponges?
- A.
Calcarea
- B.
Hexactinellida
- C.
Demospongiae
- D.
Sclerospongiae
- 2.Food particles caught on the choanocytes’ collars are dispersed to other cells by amoebocytes that move around freely in the sponge.
- A.
True
- B.
False
- 3.In the Ediacaran Period, most faunal assemblages possessed no hard parts.
- A.
True
- B.
False
- 4.Multi-celled organisms, likely with loose associations with single-celled Protists that form simple colonies for survival.
- A.
Protozoans
- B.
Metazoans
- C.
Eukaryotic
- D.
Prokaryotic
- 5.Some sponges do not have spicules.
- A.
True
- B.
False
- 6.The body of this class of sponge is composed of the protein “Spongin”, similar to hair/fingernail composition.
- A.
Calcarea
- B.
Demospongiae
- C.
Sclerospongiae
- D.
Hexactinellida
- 7.The flagella of the choanocytes causes a current that draws in water and food from the osculum and out the porocytes.
- A.
True
- B.
False
- 8.The fossil record shows the beginnings of multi-celled organisms during what period?
- A.
Triassic
- B.
Cambrian
- C.
Hadean
- D.
Ediacaran
- 9.The geologic range of sponges is Cambrian to Recent.
- A.
True
- B.
False
- 10.The inside of the sponge is called the _____ and is lined with a special ciliated, collared cells called _______.
- A.
Spongocoel and choanocytes
- B.
Choanocytes and spongocoel
- C.
Porocytes and ostia
- D.
Flagella and osculum
- 11.The outer cells of a sponge are “stuck” to the inner cells by a gel-like layer that serves as a biological “glue”.
- A.
Spicules
- B.
Mesozoic
- C.
Mesoglea
- D.
Mesopotamia
- 12.These complex, "coralline" sponges create stony skeletons of CaCO3, silica spicules, and spongin are in what class of sponges?
- A.
Sclerospongiae
- B.
Calcarea
- C.
Demospongiae
- D.
Hexactinellida
- 13.
![What is the life habit of sponges? - ProProfs]( "What is the life habit of sponges?")
What is the life habit of sponges?- A.
Sessile benthic
- B.
Demersal
- C.
Vagrant benthic
- D.
Epifaunal
- 14.What Phylum are sponges categorized as?
- A.
Mollusca
- B.
Cnidaria
- C.
Animalia
- D.
Porifera
- 15.Within the mesoglea are microscopic structures that appear as toy “jacks”, and serve to support the sponge.
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