Biology Quiz: Protostomal Coelomates

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What is a defining characteristic of protostomal coelomates?

The mouth forms from the anus

The segmentation is radial and indeterminate

The coelom is formed by schizocoel (correct)

The presence of dorsal nerve cord

Which of the following animal phyla are included in protostomal coelomates?

Annelids (correct)

Cnidarians

Echinoderms

Porifera

What type of nerve cord is associated with hyponeurians?

Lateral nerve cord

Central nerve cord

Ventral nerve cord (correct)

Dorsal nerve cord

How is the segmentation in protostomal coelomates described?

Spiral and determinate Signup and view all the answers

From which structure does the mouth develop in protostomal coelomates?

Blastopore Signup and view all the answers

Which characteristic is true for acoelomates?

The peritoneum is absent. Signup and view all the answers

What defines eucoelomates compared to other types?

The blastocoel disappears during development. Signup and view all the answers

Which statement applies to pseudocoelomates?

The peritoneum is absent. Signup and view all the answers

How is the coelom formed in eucoelomates?

From a split in the mesoderm. Signup and view all the answers

What is a key feature of eucoelomates regarding their body structure?

Their visceral organs are separated from the coelom. Signup and view all the answers

What distinguishes triploblastic metazoans from diploblastic metazoans?

Triploblastic metazoans develop three embryonic layers. Signup and view all the answers

In diploblastic animals, which of the following correctly represents the embryonic layers formed?

Ectoderm, endoderm Signup and view all the answers

What is the role of mesoglea in diploblastic metazoans?

It separates the ectoderm from the endoderm. Signup and view all the answers

What is a blastopore in the context of embryonic development?

The opening that connects the cavity of the gastrula to the outside environment. Signup and view all the answers

Which of the following statements about triploblastic metazoans is correct?

They have a mesodermal layer that allows for tissue differentiation. Signup and view all the answers

What is the primary function of a coelom in coelomates?

It allows internal organs to grow and move independently. Signup and view all the answers

Which statement accurately describes acoelomates?

They are filled with mesenchyme in the adult stage. Signup and view all the answers

What characterizes pseudocoelomates in terms of coelom formation?

The pseudocoelom develops from the embryo's blastocoel. Signup and view all the answers

How are coelomates and pseudocoelomates fundamentally different?

Coelomates possess a true coelom, while pseudocoelomates do not. Signup and view all the answers

Which of the following structures does not develop from the mesoderm in a pseudocoelomate?

Blastocoel Signup and view all the answers