What are the stinging cells unique to the Cnidaria? Name 3 morphological differe

Question

What are the stinging cells unique to the Cnidaria?

Name 3 morphological differences between members of the phylum Platyhelminthes and those of the phylum Cnidaria.

Compare and contrast the fertilization process in sea stars and fruit flies.

Describe how cleavage occurs in sea stars. Specifically, discuss the amount and distribution of yolk and how yolk affects the pattern of cleavage. Make a sketch of the process.

What happens during gastrulation? Describe the structures involved in gastrulation in the sea star embryo. Make a sketch of the process.

Explain how the following statement is relevant to the life cycle of Drosophila: “The larva is only a vessel, a nurturing culture environment for these cells that become the adult.”

Compare metamorphosis in sea stars and fruit flies. For each animal, name the developmental stage that is transformed into the adult. Why might metamorphosis be advantageous in the life cycle of these animals?

Name the four distinguishing characteristics of animals in the Phylum Chordata.

Which animals that we studied are oviparous? Which are ovoviviparous? Define these terms. For each animal, describe where the zygote develops, how it obtains nutrition, and the level of parental care provided.

Explanation / Answer

1.

Cnidarians are the animals with tentacles. These tentacles are covered by a specialized cells known as stinging cells. They are also called as cnidocytes. The cnidarians use these stinging cells to capture the prey by injecting venom and paralyzing the prey. Cnidarians are the only animals known to possess cnidocytes.

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