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What are the main classes into which the phylum is divided? What are some examples of each and in which form (polyp or medusae) are they found?
Coelenterates are separated into three main classes: scyphozoans, hydrozoans, and anthozoans. In hydrozoans the polypoid form predominates and like hydras, by-the-wind-sailors and Obelia. In scyphozoans the main phase is the medusoid and the best known instance is the common jellyfish (Aurelia).
Explain the term Ageing? Ageing in human being is of a multifunctional origin and there is a programmed senescence (ageing) of the cells in the body. The genetic make-up of an
mode of digestion in coelenterata
What is the problem that the theory of evolution and its rival theories try to solve? The problem that the theory of evolution, or simply evolution, and its rival theories try
Necessity of interdependence of Volvox organisms in the colonial existence
Q. What is the difference between obligate anaerobic beings and facultative anaerobic beings? Obligate anaerobic beings are those that cannot survive when oxygen is present. So
What are plankton, benthos and nekton? Plankton, benthos and nekton are the three groups into which aquatic living beings may be divided. The plankton is formed by algae and
Two chromosomes in a cell have identical length and centromere position yet are not homologous, what is different about them
Basic Physical Concepts of Plant Water Relation The main idea of this section is to explain the concept of chemical potential of water or water potential and the effect of var
Define some Advantages of breast milk for Infants? 1) Breast milk is a simple and natural method of feeding. It is hygienic, inexpensive and available at all times at the righ
The allele that causes albinism (p) is recessive to the allele for normal pigmentation (P). A normal woman whose father is an albino marries an albino man whose parents are both no
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