Question

Which of the following is a characteristic of cnidarians?

A) radula
B) mesoderm
C) gastrovascular cavity
D) bilateral symmetry
E) an anus

Answer 1

Cnidarians are characterized by having a gastrovascular cavity, radial symmetry, and cnidocytes with nematocysts.

Step-by-step explanation:

One characteristic of cnidarians is their gastrovascular cavity. Cnidarians are known for having a simple digestive system that includes this cavity, often referred to as a coelenteron. It functions in digestion, circulation, and gas exchange. They are diploblastic organisms, meaning they develop from two embryonic layers, ectoderm and endoderm. Cnidarians possess radial symmetry, which is a type of symmetry where body parts are arranged around a central axis. Moreover, they also have specialized stinging cells known as cnidocytes that contain nematocysts, which are used to capture prey and serve as a defense mechanism.

Answer 2

The correct answer is option C) "gastrovascular cavity".

Step-by-step explanation:

Cnidarians are a large group of organisms, most of them found in aquatic environments, known for having specialized cells called cnidocytes which they use to capture their preys. Other characteristic feature of cnidarians is that they have a gastrovascular cavity that serves as the primary organ used for digestion. The gastrovascular cavity is usually surrounded by tentacles that serves to trap their preys. Examples of cnidarians include corals, hydras and jellyfishes.