Introduction to Invertebrates

1. Symmetry occurs when the organism can be divided into two or more similar parts. What kind of symmetry has many imaginary lines drawn through a central point.

• Radial Symmetry
• Asymmetrical
• Bilateral Symmetry

2. What is an invertebrate with an exoskeleton, segmented body, and pairs of jointed appendages?

• flatworm
• mollusk
• arthropod
• echinoderm

3. What is an invertebrate with fluid-filled tubes to move and obtain food and oxygen?

• flatworm
• mollusk
• arthropod
• echinoderm

4. What is an animal with one or two hard shells to protect internal organs?

• flatworm
• mollusk
• arthropod
• echinoderm

5. What is an asymmetrical animal made of specialized cells without tissues or organs?

• sponge
• cnidarian
• roundworm
• segmented worm

6. What is the simplest animal with a brain and digestive system?

• sponge
• cnidarian
• mollusks
• worm

7.Which animal below would have bilateral symmetry?

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• 
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8. What is an invertebrate with stinging cells and a central body cavity?

• sponge
• cnidarian
• roundworm
• segmented worm

9. The _________________ is the tough, waterproof outer covering of an arthropod that protects, supports and helps prevent evaporation of water from the body.

• endoskeleton
• exoskeleton
• arthropods

10. Some invertebrates have a a structural support system within the animal called ___________________________.

• endoskeleton
• exoskeleton
• arthropods