Porifera Cnidaria

What are spicules made up of in Porifera?

• protein
• calcium carbonate or silica
• cellulose
• chitin

When are organisms called triploblastic ?

• When they have three body segments.
• When they have three germ layers
• When they have three pairs of legs.
• When they have three eyes.

Which of the following is not a characteristic of Cnidaria?

• comb plates

• exoskeleton
• nematocysts

• radial symmetry

What is a coelom?

• A coelom is a fluid-filled body cavity surrounded by endoderm and ectoderm on all sides

• A coelom is a fluid-filled body cavity surrounded by endoderm on all sides

• A coelom is a fluid-filled body cavity surrounded by mesoderm on one side and endoderm on the other side

• A coelom is a fluid-filled body cavity surrounded by mesoderm on all sides

Which of the following is not a correct difference between Nematoda and Platyhelminthes?

• Segmented body structure.
• Cylindrical body shape
• Presence of a complete digestive system.
• Bilateral symmetry.

Which of a the following is not a hermaphrodite?

• Tape worm

• Ascaris

• Earthworm

• Leech

Which of the following is not a characteristic of platyhelminthes?

• Segmented body.
• Bilateral symmetry.
• Incomplete digestive system.
• True body cavity

Which of the following is a wrong match between a phylum and its characteristic?

• Platyhelminthes - Segmented body

• Chordata - Notochord

• Annelida - acoelomate

• A. Arthropoda - Jointed appendages