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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.
Explain Observation or Inference required for osazone test? 1. Crystals of different shapes will be seen. Glucose and fructose give needle shaped crystals and galactose gives f
Blood Plasma - Circulation Centrifugation of blood results in its separation into two portions - a packed mass of cells which constitute around 45 per cent of the volume of t
Exchange in Alveoli The blood that enters the lungs from the heart has been routed through body tissue where mitochondria1 respiration has depleted its oxygen content. It thus
Explain Whipping foam method? Whipping is the most common method used as it forms bubbles by cutting the surface and introducing air into liquid. Repeated action makes the
Q. How different are the swimming strategies in chondrichthyes and in osteichthyes? Why do sharks need to agitate their body to swim while bony fishes do not? Bony fishes have
Examine the benefits and risks bird flu research poses to society. Indicate if you believe there are more benefits or more risks associated with this research, and give a rationale
How we attempt a question of phylum mollusca?
Viridans Streptococci These streptococci, which cause 30 to 65 per cent of NVE case unrelated to drug abuse, are normal inhabitants of the oropharynx, characteristically produce
Define Body Mass Index (BMI) or Quetelet Index? BMI is an index measure of body fat used for the assessment of disease risk. It is a figure which gives an indication of weight
It requires the existence of a reliable market for the recovered materials. Although the recovery of certain materials such as aluminium cans large plastic bottles can be profitabl
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