Unit 2 Test - Phylum Porifera and Phylum Cnidaria - NICOLE DURLAK | Library

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Which of the following is NOT an anatomical feature found in cnidarians?

C. complete digestive system

B. nerve cords

D. stinging cells

A. epidermis and gastrodermis

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Sponges primarily depend on which factor for their major body functions?

B. their mobility as adults

C. water flow through the sponge body

A. endosymbiosis

D. their dioecious reproductive structures

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What separates hydrozoans from other cnidarians?

A. derived from gastrodermal tissue

D. Their sexual organs are derived from epidermal tissue.

C. they are hermaphroditic

B. housed in cnidocytes

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Which is contained within the mesophyll?

B. multiple pores

C. spicules composed of silica

D. a polysaccharide gel and dead cells

A. a collagen-like gel and suspended cells

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Which cell type is NOT found in sponges?

B. pinacocytes

A. choanoflagellocytes

D. lophocytes

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Which is NOT a characteristic of Phylum Porifera?

D. They have no body symmetry.

C. They are multicellular.

A. They are exclusively marine animals.

B. They are sessile as adults.

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Sponges are known as what in the invertebrate phylogenetic tree?

B. the most varied of all invertebrates.

D. The simplest of all invertebrates.

A. the most habitat expansive of all invertebrates.

C. the largest of all invertebrates.

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What type of symmetry is present in vertebrates?

C. Asymmetry

A. Radial symmetry

B. Bilateral symmetry

D. None of the above

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Cnidarians typically exhibit what type of symmetry?

B. Bilateral symmetry

D. None of the above

C. Asymmetry

A. Radial symmetry

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Which two phyla are the most primitive in animals?

Phylum Porifera and Mollusca

Phylum Cnidaria and Platyhelminthes

Phylum Porifera and Phylum Cnidaria

Phylum Cnidaria and Arthropoda

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What is the common name for organisms with amoebocytes?

Mollusks

Arthropods

Sponges

Cnidarians

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How many classes belong to the phylum Porifera?

4

5

2

3

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What is the common name of Class Anthozoa?

Sea Anemone

Hydra

Jellyfish

Coral

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Which is NOT a characteristic of cnidarians?

They have a nerve net.

They have a complete digestive system.

They have a gastrovascular cavity.

They have stinging cells.

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What is the purpose of a spicule in sponges?

To filter water

To reproduce

To support the sponge's structure.

To capture prey

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What does diploblastic mean in relation to embryonic development?

Having no layers

Having multiple layers

Having two embryonic germ layers.

Having three layers

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What is a cnidocyte found in certain animals?

A cell that delivers a paralyzing sting.

A sharp, needle-like piece

A sulfur-containing protein

A root-like structure

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What characterizes an endosymbiont?

Lives within the cells of another organism.

Provides structural support

Captures prey

Filters water

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What role does spongin play in sponges?

Forms the skeletal structure of sponges.

A barbed, threadlike tube

A sharp, needle-like piece

A root-like structure

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What type of habitat can sponges be found in?

Freshwater only

Both marine and freshwater

Terrestrial

Marine only

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How do sponges reproduce?

Both sexually and asexually

Sexually only

Asexually only

By budding only

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What is the primary function of choanocytes in sponges?

To reproduce

To filter water and capture food particles

To provide structural support

To capture prey

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