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Digestive System of Class Asteroidea
Most asteroids are scavengers or carnivores and feed on snails, bivalves, polychaets, other echinoderms, fish, sponges, sea anemones and polyps of hydroids and corals. Some feed on plankton and detritus. The digestive system of sea stars extends between the oral end and aboral disc of the animal. The mouth lies at the centre of a muscular peristomial membrane. The mouth is followed by a short oesophagus that in turn opens into a large stomach. The stomach occupies most of the interior of the disc and is divided by a horizontal constriction into a large oval cardiac stomach and a smaller, flattened pyloric stomach. The walls of gastric stomach are pouched. In each arm a pair of digestive glands or pyloric caeca are present and their ducts open into pyloric stomach. The pyloric stomach leads into a short tubular intestine on the aboral side. The intestine opens to the outside through a minute anus at the centre of the aboral surface of the disc. A number of small outpocketings called rectal caeca arise from the intestine.
Q. Bitter Taste? Bitterness is an inherent property of a substance. It is due to substances such as alkaloids present in food. For example, tannins present in tea, coffee, frui
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Passage of Pollen Tube In cotton, the pollen produces a tube within an hour which grows on the surface of the stigmatic hairs, and then between the cells of the stigma at the
Another type of soil for bacteria gardens Boil some rice or potatoes in a dish unless well cooked. Drain and save the water. Use the bouillon cube to the gelatin. Use th
What is metagenesis? What are the other names of this process? Metagenesis is the type of life cycle in which there are two dissimilar forms of individuals of the same species,
Tooth associated with Persistent apical periodontitis Functional retention of the tooth : persistent lesion while remain asymptomatic function for an extended period of time .
Simultaneously with the formation of two daughter nuclei, a cleavage furrow appears in the middle of the cell. The furrows gradually deepen and divide the cell into two daughter ce
What is Muscular dystrophy Muscular dystrophy :- Defects in the muscle due to faulty nutrition.
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