12th Grade Cnidaria Quizzes, Questions & Answers

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Exploring the Diversity of Cnidarians in Marine Ecosystems

Exploring The Diversity Of Cnidarians In Marine Ecosystems

Explore the fascinating world of radiates, focusing on cnidarians like jellyfish and coral. This educational tool highlights species characteristics and adaptations, enhancing understanding of marine ecosystems. Essential for...

Questions: 27 | Attempts: 10 | Last updated: Oct 24, 2025

Sample Question 1
What class do exclusively marine solitary or colonial Cnidarians belong to in which the medusoid stage is completely absent?

Exclusively marine solitary or colonial Cnidarians in which the medusoid stage is completely absent (Sea anemones, hard corals soft corals gorgonians and and sea pens.)

Hydrozoa

Scyphozoa

Cubozoa

Sample Question 2
What are the defining characteristics of organisms in Class Anthozoa; Subclass Zooantharia (Hexacorallia)?

Polyps with fewer than eight tentacles and no mesenteries present.

Medusae with tentacles and no mesenteries.

Polyps with more than eight tentacles and mesenteries, the latter typically in cycles of 12

Corals with no tentacles but with complex structures like exoskeletons.

Sample Question 3
What is the order of Black or thorny corals within the Subclass Zooantharia?

Black or thorny corals

Scleractinia

Alcyonacea

Pennatulacea