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Q What are the major classes into which the phylum is divided? What are the few examples of each and in which form (polyp or medusae) are they found?
Coelenterates are divided into three major classes: hydrozoans, anthozoans and scyphozoans. In hydrozoans the polypoid form predominates and examples are by-the-wind- sailors, hydras and Obelia. In scyphozoans the major phase is the medusoid and the best known instance is the common jellyfish (Aurelia). In anthozoans there is only the polypoid form and sea anemones and corals are notable in this group.
The water expulsion vesicle (also known as a contractile vesicle) is an important osmoregulatory organelle in freshwater protists, which are hyperosmotic to surrounding water. Wate
Q. Function of Adenosine in brain? Adenosine has four different receptor subtypes (A1, A2A, A2B and A3). Adenosine A2A receptors are concentrated in striatum. Adenosine recepto
how efect of gravity on roots?
Tools and Techniques - Effects of Plant Growth Regulators We have discussed about the "effect of auxins". In this section we shall discuss the methodology being followed in h
Ranikhet disease Ranikhet disease, also known in the west as Newcastle disease, is a contagious and highly fatal disease of fowls caused by a virus of the genus Rubulavirus in
What are examples of nematodes? Ascaris, hookworm and filaria, all parasites of humans, are instance of nematodes (also called as roundworms).
What is Diatoms? Bacillariophyta are commonly known as diatoms because of their unique structure. These unicellular photosynthetic organisms are composed of two overlapping glas
Steam treatment Steam treatment of crop residues under pressure has recently opened a new vista for their nutritional improvement especially in the situation when steam availab
Q. Are nematodes triploblastic or diploblastic animals? Just like platyhelminthes, nematodes are triploblastics that is they present three germ layers (ectoderm, endoderm and m
Nutritional and functional role of minerals in foods Essential elements including the main elements and a number of trace elements fulfill various functions: as electrolytes, a
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