Which of the following statements is FALSE?

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BlackTom AI · Accepted Answer

Question restatement: Which of the following statements is FALSE?

Option a: Sponges are cell aggregates. This statement is generally considered true because sponges (Porifera) lack true tissues and organs and consist of loosely organized cells that form a cellular aggregation rather than a true integrated tissue system. The behavior of cells and their coordination through a mesohyl matrix supports this view.

Option b: Cnidarians are diploblastic animals. This is true. Cnidarians typically develop from two germ layers, the ectoderm and endoderm, forming a diploblastic body plan, sometimes described as having two tissue layers separated by a gelatinous mesoglea.

Option c: All Bilateria are triploblastic. This is true in the vast majority of Bilateria, which normally develop with three germ layers (ectoderm, mesoderm, endoderm). There are rare or debated exceptions, but the standard characterization is triplo-blastic for Bilateria as a group.

Option d: Cnidarians are asymmetrical animals. This is false. Cnidarians exhibit radial symmetry (oral-aboral axis) in many of their forms (e.g., polyp and medusa), and they do not display true bilateral symmetry except in some simplified or evolutionary contexts. Thus this statement mischaracterizes cnidarians and is the incorrect choice.

Additional notes: Misconceptions often arise from conflating tissue organization with symmetry. Remember that diploblastic and tripoblastic refer to germ layers, not symmetry, and sponges occupy a cellular level of organization rather than true tissues, which aligns with option a as true and option d as false. The reasoning emphasizes distinguishing tissue organization (cell aggregates vs. tissues) from symmetry (radial vs. bilateral).

MCD4420 - T3 - 2025 Lab 2 In-Class Post-Lab Quiz

Which of the following statements is FALSE?

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