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PopulationYou must be familiar with the term 'population'. It is one of the most talked about issues of this century. It is feared that the rapid growth of the world population if allowed to continue, might outstrip the food supply in the near future. The present high rate of population growth is a major concern of the governments, scientists and administrators. Have you ever wondered as to what is meant by population?In a technical sense 'population' is defured as a group of freely interbreeding the same species present in a specific area at a given time. For example, when we say thatindividuals of the population of a city is 50,000, we mean that there are 50,000 individuals of Homo sapiens in that town. Other living organisms, for example cats and dogs present in the city are not included as they are populations of two different species.In nature, population of a species is subdivided into a number of local breeding populations called deme. Demes are geographically separated populations of the same species. For example, the garden lizards of Qutub Minar. Delhi, form a separate deme from the garden lizard of Lodi Gardens, Delhi or the garden lizards of Swaraj Bhawan, Allahabad. Consequently, in a deme each individual has an equal opportunity of mating with another individual of the opposite sex, but not with individuals in another deme. Because of frequent mating and similar environmental conditions members of a deme resemble each other more closely.A population exhibits certain characteristics which can only be expressed at the population level and not shared by the individuals of the population. For example, individual organisms are born, grow and die but characteristics such as birth rate, death rate, density are only meaningful at the population level.
Q. What are the examples of secretory cells? Endocrine and exocrine pancreatic cells, parathyroid and thyroid endocrine cells, adenohypophysis, adrenal and pineal endocrine cel
'Absolute food safety' is the assurance that damage or injury from use of a substance is impossible. Normal 0 false false false EN-US X-NON
Obturator - Ovule An obturator is an outgrowth of the placenta or funicle or integument or style near the micropyle. It is presumed to guide the pollen tube to the micropyle.
types of parthenocarpy
Q. What is the cell cycle? The Cell cycle, or mitotic cycle, is the time period that begins when the cell is finishes and created when it is divided by mitosis creating two dau
what are disadvantage of protozoa
Q. What are the environmental harms caused by mercury pollution? What are the main sources of mercury pollution? The Mercury is a metal that when present in the water of rivers
what is an autotroph?
Fructose-1,6-bisphosphate and Fructose-6-phosphate : The conversion of fructose-1,6- bisphosphate to fructose-6-phosphate is catalysed by fluctose-1,6-bisphosphatase which i
Alfred Sturtevant and Seymour Benzer's studies of recombination in both Drosophila and bacteriophage demonstrated which of the following? A. The gene is an indivisible unit and
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