Biology Quiz: Invertebrate Phyla

Which phylum is known as roundworms due to their circular cross-section body?

• Annelida

• Arthropoda

• Aschelminthes

• Mollusca

Answer explanation

Aschelminthes is known as roundworms due to their circular cross-section body, making it the correct choice.

Which phylum includes organisms that are bilaterally symmetrical, triploblastic, and pseudocoelomate?

• Aschelminthes

• Platyhelminthes

• Arthropoda

• Annelida

Answer explanation

The phylum Aschelminthes includes organisms that are bilaterally symmetrical, triploblastic, and pseudocoelomate, making it the correct choice.

What is the body surface of Annelida distinctly marked out into?

• Rings

• Metameres

• Scales

• Segments

Answer explanation

The body surface of Annelida is distinctly marked out into metameres, which are repeated body segments with similar structures.

Which phylum has the largest number of named species on earth?

• Mollusca

• Annelida

• Arthropoda

• Aschelminthes

Answer explanation

Arthropoda is the phylum with the largest number of named species on earth, making it the correct choice.

What type of circulatory system do arthropods have?

• Semi-closed

• Closed

• Open

• No circulatory system

Answer explanation

Arthropods have an open circulatory system, where the blood is pumped into the body cavity and comes in direct contact with tissues and organs.

Which phylum includes the economically important insects such as Honey bee and Silkworm?

• Annelida

• Platyhelminthes

• Arthropoda

• Aschelminthes

Answer explanation

The correct phylum that includes economically important insects like the Honey bee and Silkworm is Arthropoda.

What is the excretory organ in arthropods responsible for waste removal?

• Pharynx

• Gills

• Malpighian tubules

• Nephridia

Answer explanation

The excretory organ in arthropods responsible for waste removal is the Malpighian tubules.

Which phylum includes the roundworm Ascaris and the hookworm Ancylostoma?

• Mollusca

• Aschelminthes

• Arthropoda

• Annelida

Answer explanation

The phylum Aschelminthes includes the roundworm Ascaris and the hookworm Ancylostoma, making it the correct choice.

What is the respiratory organ in arthropods responsible for gas exchange?

• Pharynx

• Gills

• Malpighian tubules

• Tracheae

Which phylum includes the organisms known for their jointed appendages?

• Mollusca

• Annelida

• Arthropoda

• Aschelminthes