Invertebrates

What is an Invertebrate?

• Animals that have spines or

  backbones.

• Animals that don’t have spines or

  backbones.

Which animal groups are invertebrates?

Select all that apply.

• Arthropods

• Mammals

• Echinoderms

• Molluscs

• Amphibians

What is an exoskeleton, and why do adult insects shed it?

• A soft covering that protects the body; they shed it to stay clean.
  

• 
  A hard covering over the body; they shed it as their bodies grow larger.
  

• 
  A flexible outer layer; they shed it to avoid predators.
  

• 
  A type of internal skeleton; they shed it to repair damage.

What is the main function of an arthropod's exoskeleton?

• To help the arthropod digest food.
  

• To protect the body, give it structure, and help with movement.
  

• To allow the arthropod to climb walls.

• To grow as the arthropod grows.

Why must arthropods shed their exoskeletons?

• To repair damage to their body.
  

• To keep their exoskeleton clean.
  

• Because the exoskeleton cannot grow as the arthropod grows.

• Because the exoskeleton gets too heavy for the arthropod to carry.

Which of the following is NOT an example of an insect?

• Beetle

• Butterfly

• Spider

• Bee

Insects make up ____________of all animal species on Earth.

• 1/2

• 
  3/4
  

• 1/3
  

• Almost all

What are pedipalps, and what is their main function in arachnids?

• A type of leg used for walking.
  

• Jaws used for chewing prey.
  

• Appendages that help to capture or hold prey.

• Eyes that help detect motion.

Where are crustaceans usually found, and what is special about their first pair of legs in some species?

• In forests; their first pair of legs are used for climbing.

• Underground; their first pair of legs are used for digging.
  

• In the ocean; their first pair of legs end in claws.
  

• On land; their first pair of legs are wings.
  

Which of the following statements is true about myriapods?

• Myriapods have between 10 to 200 legs.
  

• Myriapods are insects with six legs.
  

• Myriapods only include centipedes.
  

• Myriapods are animals with no legs.