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In the last unit we traced the human evolutionary history mostly from a palaeontological viewpoint. Although still fragmentary, the available fossil evidence makes it possible to construct a more or less coherent story of human origin and its development. Besides suggesting a primate ancestory, fossil evidence has indicated various trends in human evolution. Today the modern man is regarded as a climax of the evolutionary process. But several questions are raised as to which direction the human evolution is proceeding now and what direction will it take in the future. Is the be-all and end-all of all the evolutionary process? Or do human beings continue to evolve biologically? It may not be possible to provide a direct answer to these questions since evolution is a long term process and the effects could be visualised only after tens of thousands of years.
ECOSYSTEM Plants, animals and human beings live in association with a wide variety of other plants and animals. These communities of organisms are not mere ad boc collections of
Q. Food borne infections? Food borne infections, as you may recall reading earlier, are caused by the ingestion of pathogenic microorganisms that penetrate the intestinal muco
Endocrine versus Neural Integration A question that surely comes across your mind is, "what is the need for two types of integrative mechanisms, the neural and the endocrine"
in a school laboratory, what is usually regarded as evidence that photosynthesis has occurred in plants
Epizootic lymphangitis Epizootic lymphangitis (pseudo-glanders) is a chronic, insidious and highly contagious fungal disease of equines particularly horse and very rarely of c
Compare and contrast the effect of a deletion in the operator of the lactose operon with one in the operator of the histidine operon.
Define Capsule Staining (Anthony Staining Method)? A rigid, well-organized gelatinous layer called capsule is present outside the cell wall of many bacteria e.g. Streptococus p
NERV E FIBRES - Axon or dendrite of a nerve cell covered with one, two or three sheaths is called nerve fibre. Dendrites are surrounded only by one sheath. An axon may b
Which of the following statement is true regarding the replication of DNA strands? A. The products of replication include one double helix made exclusively of parental DNA and
Q. Demonstrate the counselling process in the form of role play? Role playing refers either to the unconscious changing of one's behavior to assume a social role or roles in lif
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