The two forms of cnidarians are polyp and medusae. A polyp is a sedentary form, whereas medusae are free-swimming. Some of the cnidarians such as... View Article
Polyps are sedentary, whereas medusae are free-swimming forms. It contracts and forces water out, which helps the organism in propelling forward.... View Article
Tentacles have cnidoblasts (stinging cells) at the tip, which capture and immobilise the prey. Tentacles move the captured food to the mouth.... View Article
The water-filled coelenteron acts as a hydrostatic skeleton in polyps. In medusae, the mesoglea layer provides support. Some of the cnidarians... View Article
Cnidarians are carnivorous. They immobilise their prey by toxins released from nematocysts. Once captured, tentacles move the food to the mouth.... View Article
Phylum Cnidaria mostly contains marine aquatic animals, which are sessile or free-swimming. It includes hydra, jellyfish, corals, sea anemone,... View Article
The five main characteristics of cnidarians are: Radial symmetry Diploblastic animals Tissue level of organisation Presence of cnidoblasts with... View Article
Phylum Coelenterata is also known as Cnidaria due to the presence of cnidoblasts or cnidocytes on the tentacles and body surface. They contain... View Article
Cnidarians exhibit polymorphism and have two body forms, viz. polyp and medusa. Medusa is an umbrella-shaped and free-swimming form. The class... View Article
Cnidoblasts are the characteristic feature of the phylum Cnidaria. These are present on the body surface and tentacles. They contain nematocysts,... View Article
Zooids are the individual polyps present in the colonies of hydroids. Individual zooids in the colony perform various different tasks such as... View Article
Yes, animals of the phylum Porifera and Cnidaria are acoelomates. They do not possess a body cavity, which is lined by mesoderm. Also Check:... View Article
Cnidarians are diploblastic. The embryonic layer constitutes ectoderm and endoderm. Mesoglea is present between ectoderm and endoderm, which is... View Article
Coelenterata is the other name of the phylum Cnidaria. It contains mostly marine aquatic animals such as hydra, jellyfish, coral, sea anemone,... View Article
There is no specialised excretory system found in cnidarians. Most of the cnidarians expel their waste out through the body surface by diffusion... View Article
Animals of the phylum Porifera have an asymmetrical body with the cellular level of body organisation, whereas cnidarians have radial symmetry... View Article
Cnidarians are characterised by the presence of cnidoblasts or cnidocytes. They contain nematocysts, which is a stinging capsule present on their... View Article
The digestive system of cnidarians is incomplete. The central gastro-vascular cavity has only one opening, which is used as a mouth as well as... View Article
Yes, Cnidarians have a tissue level of organisation. Cells performing the same function are arranged as tissues. Their body is diploblastic. The... View Article
The phylum Cnidaria contains aquatic animals and mostly marine. They are free-swimming or sessile. Examples are sea anemone, hydra, jellyfish,... View Article
