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Statistical Measures - Population
A population has a number of group characteristics that are statistical measures unique to the population group and are not the characteristics of the individual. These group characteristics are density, natality, mortality, immigration and emigration, age distribution, dispersion, growth, regulation and genetic composition. Density or size of population, however, is its basic characteristic and is affected, by other group characteristics such as natality, mortality, immigration and emigration. any change in the density of the population implies a change in one or more of these four characteristics. The relationship between these factors is expressed as follows:
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,
What are the three periods into which interphase is divided? Interphase is the preceding phase to the mitotic division. It is separated into three periods, G1, S and G2 (the l
Migration in birds
basis of genetic transplantation
Q. What are the major human diseases caused by roundworms? The major human diseases caused by nematodes are ancylostomiasis, ascariasis (hookworm infection) and filariasis (com
What do you understand by Coelenteron? The name given to internal cavity of the cnidarians. This is an incomplete gut with just one opening, the mouth. Food to be digested and
What is the difference between nematocyst and spicules? Nematocysts are on Cnidarians Spicules are in Poriferae
Q. Comparative picture of ecosystem? An ecosystem having higher diversity means the number of species and interactions between them which constitute the food web, is large. In
What is prophylaxis? Prophylaxis are measures taken to stop diseases. For instance, the use of condoms in sexual relations is a prophylaxis against contamination by agents that
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