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6. The body plan of sponges is an aggregation of cells built around water?

  • A central core
  • Water canal system
  • Chanocytes

7. What is the name of the group that has calcium carbonate spicules?

  • Calcareous sponges
  • Silisponge
  • Sessile sponges
  • Basic sponges

8. Water enters the sponge through

  • Choanocytes
  • Small pores
  • The water canal

9. Spicules are often a key identification features of different sponges

  • True
  • False

10. Some sponges show radial symmetry but most show no symmetry

  • True
  • False

11. How many species are sponge are freshwater species?

  • 50
  • 30
  • 60
  • 20

12. What are Sponges hard skeletal elements called?

  • Chanocytes
  • Tube feet
  • Spicules
  • Spines

13. Sponges have a true body cavity

  • False
  • True

14. Sponges have what kind of body symmetry?

  • None
  • Radial
  • Bilateral

15. Sponges have some specialised cells

  • True
  • False

16. Sponges have complicated body plans

  • False
  • True

17. How many major groups of sponge are there?

  • 6
  • 3
  • 5
  • 2

18. Two of the groups have spicules made of

  • Silica
  • Calcium carbonate