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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 major types of lipids? The main types of lipids are phospholipids, triglycerides (fats and oils), waxes and steroids.
Define Pre-Exercise or Pre-Event Meal for athletes? Suitable foods in adequate quantities at all times should be consumed but before the event, strategies to fuel up the energ
Oral irrigation Devices The use of oral irrigation devices has been controversial due to concerns about incomplete plaque removal and potential separation of connective issue f
Storage Excretion Many insects exhibit a phenomenon known as storage excretion. If excretory products are stored in the body instead of being eliminated, no water is expended
How do the cDNAs vary from the original genes? A. The inserted cDNA copies lack enhancers, promoters and introns. B. The genomic structures of the original gene and the ins
ORGANIZER THEORY - It was propounded by spemann (1901). He was given Nobel prize of 1935 for this wrok. He studied the embryonic development of frog, newt & other amph
A fifth member of the monoamine transmitter group is histamine. That release histamine as their neurotransmitter is located in the hypothalamus and project to cerebral cortex, lim
What is the acrosome of the sperm cell? How is it formed? The acrosome is a structure that has a great number of digestive enzymes, it is located in the anterior end of the spe
What is the first step normally taken when you look through the oculars? The nuclei of the cheek cells have been stained using a special dye so that they appear purple. What is the
Tracheal system in cockroach Cockroach belongs to phylum Arthropoda under invertebrate. They have specially developed tracheal system for respiration The system consis
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