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

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10. What causes bleaching in corals?

Stress-induced expulsion of zooxanthellae

Gaining of zooxanthellae

Over-production of calcium carbonate

Under-production of calcium carbonate

11. True or False?Cnidarians are diploblastic.

True

False

12. How many species of porifera are there?

15,000+

150+

1,500+

150,000+

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

Interfering with neurotransmission

Lysing cell membranes

Damaging muscle cells

14. 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

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15. Match the two stages of the Cnidarian life cycle to what occurs at this stage.

Sessile polyp stage

Motile medusa stage

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16. Match the classes of Porifera to their characteristics.

Class Calceria

Class Hexactinellida

Class Demospongia

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

1. The cnidarian gut is a blind sac called the ____________________.

2.

What first name or nickname would you like us to use?

2. What is the 'scientific' name for corals?

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

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

5. What is the 'scientific' name for the sponges?

6. 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 _______.

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

8. Name a clade of Cnidarian.

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

10. What causes bleaching in corals?

11. True or False?Cnidarians are diploblastic.

12. How many species of porifera are there?

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

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

15. Match the two stages of the Cnidarian life cycle to what occurs at this stage.

16. Match the classes of Porifera to their characteristics.