Bio1331 Animals - Evolution - Major Diploblast Groups (Lecture Three)

Complete the following sentence.Porifera are characterised by aggregations of cells around a water canal system, extracellular matrix of collagen, glycoproteins and skeletal elements called _______. 

Complete the following sentence:In the blastula of the Glass Sponge, micromeres and macromeres merge to form a multinucleated '_________________'.

Name a clade of Cnidarian.

Complete the following sentence: All cnidarians are carnivores, using toxins in ________ to subdue prey.

The cnidarian gut is a blind sac called the ____________________.

What is the 'scientific' name for corals?

Complete the following sentence:Anthozoan polyps form a skeleton by secreting a matrix of organic molecules on which they deposit _____________.

Name the symbiotic, unicellular, photosynthetic algae that anthozoans host in their tentacles.

What causes bleaching in corals?

• Stress-induced expulsion of zooxanthellae

• Gaining of zooxanthellae

• Over-production of calcium carbonate

• Under-production of calcium carbonate

True or False?Cnidarians are diploblastic.

• True

• False

How many species of porifera are there?

• 15,000+

• 150+

• 1,500+

• 150,000+

The phospholipases in toxins cause paralysis.How do they do this?

• Interfering with neurotransmission

• Lysing cell membranes

• Damaging muscle cells

Which of the following do Porifera NOT have?You may tick more than one.

• Cell layers

• Organs

• Symmetry

• Nerves

• Muscles

• An osculum

• Choanocytes

• Spicules

• Water canal system