Characteristics and Functions of Animals

The video introduces invertebrate animals, highlighting six groups: arthropods, mollusks, worms, cnidarians, echinoderms, and sponges. Each group is explored in detail, discussing their characteristics, habitats, and interesting facts. Arthropods have exoskeletons and jointed legs, mollusks have soft bodies with or without shells, worms are vital for soil health, cnidarians include jellyfish and polyps, echinoderms have tube feet, and sponges are porous marine animals.

Which of the following is NOT a characteristic of invertebrate animals?

• They have a backbone.

• They lack a skeleton.

• Some have hard outer shells.

• They are divided into six groups.

What is the process called when arthropods shed their exoskeleton?

• Exfoliating

• Peeling

• Shedding

• Molting

Which group of arthropods has eight legs?

• Myriapods

• Insects

• Arachnids

• Crustaceans

What is a common feature of mollusks?

• They have a hard exoskeleton.

• They have jointed legs.

• They have a backbone.

• They have a soft body.

Which group of mollusks is known for having long tentacles?

• Arthropods

• Gastropods

• Cephalopods

• Bivalves

How do worms primarily breathe?

• Through their lungs

• Through their skin

• Through their mouth

• Through gills

What is the primary role of earthworms in the soil?

• They eat plants.

• They repel insects.

• They help oxygenate the soil.

• They produce seeds.

What is a unique feature of cnidarians?

• They have a backbone.

• They can fly.

• They have tentacles with toxic substances.

• They live on land.

What happens when a starfish loses one of its legs?

• It becomes immobile.

• It changes color.

• It grows a new leg.

• It dies.

How do sponges feed?

• By photosynthesis

• By filtering plankton and bacteria

• By hunting small fish

• By absorbing sunlight