Animal Classification

Which phylum do insects belong to?

• Mollusca

• Chordata

• Echinodermata

• Arthropoda

Answer explanation

Insects belong to the phylum Arthropoda. This phylum includes organisms with an exoskeleton, a segmented body, and jointed appendages. Other options like Mollusca, Chordata, and Echinodermata are incorrect as they represent different types of organisms, not insects.

Which phylum do jellyfish belong to?

• Mollusca

• Cnidaria

• Echinodermata

• Arthropoda

Answer explanation

Jellyfish belong to the phylum Cnidaria. This phylum also includes other marine creatures like sea anemones and corals. The other options, Mollusca, Echinodermata, and Arthropoda, are incorrect as they represent different phyla that include organisms like snails, starfish, and insects respectively.

Which phylum do spiders belong to?

• Mollusca

• Arthropoda

• Chordata

• Annelida

Answer explanation

Spiders belong to the phylum Arthropoda. This phylum includes invertebrates with an exoskeleton, a segmented body, and paired jointed appendages. Other phyla like Mollusca, Chordata, and Annelida do not include spiders. Therefore, the correct answer to the question is Arthropoda.

Which phylum do fish belong to?

• Chordata

• Mollusca

• Arthropoda

• Annelida

Answer explanation

Fish belong to the phylum Chordata. This phylum includes animals that have a notochord, a dorsal nerve cord, and pharyngeal slits at some point in their life cycle. Other options like Mollusca, Arthropoda, and Annelida are incorrect as they represent different phyla that do not include fish.

Which phylum do sponges belong to?

• Cnidaria

• Platyhelminthes

• Nematoda

• Porifera

Answer explanation

Sponges belong to the phylum Porifera. This phylum is unique because it is the only one that contains sponges. The other options, Cnidaria, Platyhelminthes, and Nematoda, are phyla that include different types of organisms, but not sponges.

Which phylum do earthworms belong to?

• Arthropoda

• Mollusca

• Echinodermata

• Annelida

Answer explanation

Earthworms belong to the phylum Annelida. This phylum is characterized by segmented bodies and includes various worms and leeches. The other options, Arthropoda, Mollusca, and Echinodermata, are incorrect as they represent different types of organisms such as insects, mollusks, and sea stars respectively.

Which phylum do starfish belong to?

• Echinodermata

• Arthropoda

• Chordata

• Mollusca

Answer explanation

Starfish belong to the phylum Echinodermata. This phylum is characterized by a water vascular system, radial symmetry, and a body covered with spines. Other phyla such as Arthropoda, Chordata, and Mollusca do not include starfish. Therefore, the correct answer to the question is Echinodermata.

Which phylum do crustaceans belong to?

• Mollusca

• Chordata

• Echinodermata

• Arthropoda

Answer explanation

Crustaceans belong to the phylum Arthropoda. This phylum includes invertebrate animals with an exoskeleton, a segmented body, and paired jointed appendages. Other options like Mollusca, Chordata, and Echinodermata are incorrect as they represent different types of organisms.

Which phylum do snails belong to?

• Mollusca

• Echinodermata

• Chordata

• Arthropoda

Answer explanation

Snails belong to the phylum Mollusca, which is a diverse group of invertebrates that includes animals like snails, slugs, clams, and octopuses. Mollusks are characterized by their soft bodies, which are often protected by a hard shell in species like snails. The other options, Echinodermata, Chordata, and Arthropoda, represent different phyla of animals and do not include snails.

Which phylum do amphibians belong to?

• Chordata

• Arthropoda

• Annelida

• Mollusca

Answer explanation

Amphibians belong to the phylum Chordata, which is a group of animals characterized by the presence of a notochord, a dorsal hollow nerve cord, and pharyngeal slits. Chordata includes other groups such as mammals, birds, and reptiles. The other options, Arthropoda, Annelida, and Mollusca, are incorrect as they represent different phyla with distinct characteristics.