Question

1. the trigger of a cnidocyte is also known as the operculum. (1 point)truefalse20. an example of an organ that a cnidarian has is a simple stomach. (1 point)truefalse21. sea anemone, coral, and hydra are of the polyp body plan. (1 point)truefalse

Explanation:

1. The trigger structure of a cnidocyte is called a cnidocil, while the operculum is the lid-like structure covering the nematocyst capsule, not the trigger.
2. Cnidarians have a gastrovascular cavity, which functions in both digestion and circulation, but they do not have a true organ-level stomach as defined in more complex animals.
3. Sea anemones, corals, and hydra all exhibit the sessile, cylindrical polyp body plan, which is one of the two main body forms of cnidarians (the other being the medusa).

Answer:

1. False
2. False
3. True