Question

1. name 3 harmful insects.
2. name 3 examples of a crustacean.
3. (true or false) sponges are plants.
4. (true or false) an earthworm uses its crop to protect its body.
5. (true or false) lobsters, crabs, and crayfish are all crustaceans.

Explanation:

• For question 18: Mosquitoes spread diseases like malaria. Cockroaches can contaminate food. Termites damage wooden structures.
• For question 19: Crabs have hard exoskeletons and jointed legs. Lobsters are marine crustaceans. Shrimps are also common crustaceans.
• For question 20: Sponges are animals. They belong to the phylum Porifera. They are multicellular, heterotrophic, and lack true tissues.
• For question 21: The crop in an earthworm is part of its digestive system (stores food). The earthworm uses its slimy mucus and body shape for some protection, not the crop.
• For question 22: Lobsters, crabs, and crayfish all have the characteristics of crustaceans such as a hard exoskeleton, two pairs of antennae, and segmented bodies.

Answer:

1. Mosquito, cockroach, termite
2. Crab, lobster, shrimp
3. False
4. False
5. True