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Annelid Worms and Cephalization

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Questions and Answers

Which group of animals shows a reasonable degree of cephalization?

Flatworms

Annelid worms (correct)

Roundworms

Cnidarians

What is the neuroendocrine control system responsible for in annelids?

Epitoky (correct)

Reproductive development

Growth regulation

Stolonization

What inhibits epitoky in annelid worms?

Neurosecretory neurons

A hormone release (correct)

Well developed circulatory system

Large brain size

Where are large numbers of neuro-endocrine cells found in molluscs?

Ganglia of the central nervous system Signup and view all the answers

What type of regulatory processes are controlled by substances released by neuro-endocrine cells in snails?

Osmotic and ionic regulatory processes Signup and view all the answers

Why is reproduction complicated in molluscs?

Many are hermaphroditic Signup and view all the answers

What is the term used to describe the phenomenon where male gametes appear before female gametes?

Protandry Signup and view all the answers

In cephalopods, what structures are thought to play an important role in reproduction under endocrine control?

Optic glands Signup and view all the answers

Which group of crustaceans has a predominantly neuro-endocrine control system?

Malacostrans Signup and view all the answers

What is the function of the Y organ in crustaceans?

Molting Signup and view all the answers

What is the role of the androgenic gland in crustaceans?

Sperm production Signup and view all the answers

What advantage do many crustaceans gain from their ability to change color?

Avoiding detection by predators Signup and view all the answers