FREE BIOLOGY AND STUDY GAMES ABOUT PORIFERA

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CNIDARIA EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

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-Guarantee passing score -51 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Epidermis

Answer:

(in invertebrates) A single layer of cells derived from the ectodermal embryonic layer

Question 2: Cnidaria

Answer:

Phylum name meaning "stinging nettle"

Question 3: Sycon

Answer:

Sponge body form that is second in complexity; water first flows into the sponge through incurrent canals

Question 4: Class Scyphozoa

Answer:

The cnidarian class containing the true jellyfish

Question 5: Class Calcarea

Answer:

The calcareous sponges

Question 6: Cnidocil

Answer:

The sensory structure attached to cnidocytes that senses touch and releases the nematocyst

Question 7: Mesophyl

Answer:

Jelly-like layer where mesenchyme cells are found

Question 8: Zooids

Answer:

Colonial polyps with a specialized function such as those found as part of the Portuguese Man o' War

Question 9: Gastrovascular cavity

Answer:

The large central cavity of cnidarians that receives and digests food; has a single opening serving as both mouth and anus; not a true body cavity

Question 10: Mesenchyme cells

Answer:

Amoeboid cells in the mesophyl; specialized for reproduction, secreting "skeleton",and transporting/storing food

Question 11: Class Cubozoa

Answer:

The cnidarian class containing the box jellies

Question 12: Class Hydrozoa

Answer:

The cnidarian class containing the hydras

Question 13: Coral bleaching

Answer:

The event that occurs when zooxanthellae in coral polyps die due to changes in the ocean water.

Question 14: Rhopalium

Answer:

A specialized sensory structure at the edge of the scyphozoan medusa

Question 15: Polyp

Answer:

The attached (sessile), usually asexual, stage of a cnidarian

Question 16: Porocytes

Answer:

Pinacocytes that are specialized for regulating water circulation

Question 17: Spongin

Answer:

A more fibrous & squishy substance that makes up sponge bodies

Question 18: Class Hexactinellida

Answer:

The glass sponges

Question 19: Diploblastic

Answer:

Organisms having 2 embryonic layers called the ectoderm and the endoderm

Question 20: Spicules

Answer:

Needle-like structures made of calcium carbonate or silica that make up sponge bodies

Question 21: Porifera

Answer:

Phylum name meaning "to bear pores"

Question 22: Sessile

Answer:

Not able to move freely

Question 23: Asymmetry

Answer:

Having a body plan that is not easily divided into even sections

Question 24: Dioecious

Answer:

Sexes (male/female) on different individuals

Question 25: Choanocytes

Answer:

"Collar cells"; line the spongocoel and create a water current to filter food particles out of the water

Question 26: Budding

Answer:

A form a asexual reproduction in which offspring emerge off the parent's side

Question 27: Nematocyst

Answer:

A stinging structure found in cnidarians that is usually armed with spines or barbs and contains a venom that is injected into a prey's flesh

Question 28: Leucon

Answer:

The most complex sponge body form; lacks a spongocoel