NEET BIOLOGY

Detailed explanation-1: -Characteristic Features of Phylum Coelenterata. They are multicellular organisms, exhibiting tissue grade of the organisation. They are diploblastic, with two layers of cells, an outer layer called the ectoderm and the inner layer called the endoderm.

Detailed explanation-2: -In some species, cnidocytes can also be used as anchors. Cnidarians are also distinguished by the fact that they have only one opening in their body for ingestion and excretion i.e. they don’t have a separate mouth and anus.

Detailed explanation-3: -Cnidarians carry out extracellular digestion, where enzymes break down the food particles and cells lining the gastrovascular cavity absorb the nutrients. Cnidarians have an incomplete digestive system with only one opening; the gastrovascular cavity serves as both a mouth and an anus.

Detailed explanation-4: -cnidarian, also called coelenterate, any member of the phylum Cnidaria (Coelenterata), a group made up of more than 9, 000 living species. Mostly marine animals, the cnidarians include the corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans.

Detailed explanation-5: -The two digestive system structures that appeared first in cnidarians was stomachs and mouth. A cnidarian has two sets of muscles that allows it to bend in diffeeent direction. The nerve cells controls the cnidarians movement.