Earthworm Anatomy and Movement

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Questions and Answers

What is the primary function of the chaetae in earthworms?

To produce oxygencarrying hemoglobin
To provide structural support
To provide traction for burrowing (correct)
To aid in respiration

What is the primary organ of respiration in earthworms?

Cerebral ganglia
Skin (correct)
Gizzard
Intestine

What is the function of the metanephridia in earthworms?

To remove wastes from the blood and coelomic fluid (correct)
To regulate body temperature
To store food in the digestive system
To produce oxygencarrying hemoglobin

Which part of the earthworm's nervous system connects to a subpharyngeal ganglion?

Dorsal vessel (D) Signup and view all the answers

What is the name of the structure that surrounds the pharynx in the earthworm's nervous system?

Ring of nerves (D) Signup and view all the answers

What is the function of the dorsal and ventral vessels in the earthworm's circulatory system?

To link segmental pairs of vessels (D) Signup and view all the answers

Where does digestion continue after the pharynx sucks in small pieces of food?

Gastrovascular cavity (D) Signup and view all the answers

What is the function of the ganglia in rhabditophorans?

Processing of sensory input (A) Signup and view all the answers

What is the characteristic of the reproductive organs in rhabditophorans?

They occupy nearly the entire interior of the worm's body (B) Signup and view all the answers

What is the primary habitat of mature flukes?

Blood vessels of the human intestine (B) Signup and view all the answers

What is a characteristic of trematodes?

They parasitize a wide range of hosts (D) Signup and view all the answers

What is the fate of undigested wastes in rhabditophorans?

They are egested through the mouth (D) Signup and view all the answers

What is the primary function of the mantle in molluscs?

To secrete a shell and form a mantle cavity (D) Signup and view all the answers

What is the role of the nephridia in molluscs?

To remove metabolic wastes from the hemolymph (B) Signup and view all the answers

What is the primary function of the radula in molluscs?

To scrape up food particles using a strap-like organ (A) Signup and view all the answers

What is the characteristic of the circulatory system in most molluscs?

It is an open system with a heart that pumps hemolymph (B) Signup and view all the answers

What is the main cavity that houses the gills, anus, and excretory pores in molluscs?

The mantle cavity (C) Signup and view all the answers

What is the location of the heart in molluscs?

Dorsally located near the visceral mass (D) Signup and view all the answers

What is characteristic of most isopods?

They are small marine species. (B) Signup and view all the answers

What is the main function of krill in marine ecosystems?

They are a major food source for baleen whales. (D) Signup and view all the answers

What is unique about the adhesive of barnacles?

It is extremely strong. (A) Signup and view all the answers

What is the primary component of the cuticle of decapods?

Calcium carbonate (B) Signup and view all the answers

Which crustaceans are among the most numerous of all animals?

Copepods (B) Signup and view all the answers

What is the primary mode of feeding of barnacles?

Filter feeding (C) Signup and view all the answers

Which of the following crustacean groups is characterized by having approximately 10,000 species?

Isopods (C) Signup and view all the answers

What is the primary function of the specialized pair of appendages in male lobsters and crayfish?

Transfer of sperm to the female's reproductive pore (A) Signup and view all the answers

Where do crustaceans typically exchange gases?

Through thin areas of the cuticle (D) Signup and view all the answers

What is the primary mechanism for excreting nitrogenous wastes in crustaceans?

Diffusion through thin areas of the cuticle (B) Signup and view all the answers

Which of the following crustaceans is characterized by having 19 pairs of appendages?

Lobsters and crayfish (C) Signup and view all the answers

What is the primary advantage of crustaceans being able to regenerate lost appendages?

Ability to replace lost appendages during molting (D) Signup and view all the answers

What is the characteristic of the body cavity in lophophorates?

True coelom completely lined with mesoderm (B) Signup and view all the answers