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Define age related changes in Cardiovascular system
There is a decrease in elasticity of the aorta and other large arteries as age increases. Thickness of blood vessels increases leading to a rise in blood pressure. The myocardium (muscle wall of the heart) shows atrophy. There are structural changes in the valves. Number of pacemaker cells gets reduced, thereby a reduction in heart rate is observed.
Control of soil erosion: The most significant measures of erosion control include (i) growth of grasses, shrubs and trees on soils and (ii) construction of a drainage system w
Explain an Amniocentesis An amniocentesis is a process used to obtain a small sample of the amniotic fluid which surrounds the foetus to diagnose chromosomal disorders and open
What is the professional name for the person who studies fossils? Paleontologist
Explain about the soil formers Soil development or soil genesis as it is called, is the result of a number of factors such as parent material, topography, time, climate and bio
To study the formation of a drop of liquid Gently pour aniline into a large beaker of cold water unless a layer about half an inch deep accumulates at the bottom. Place the bea
What are the Cultural Practices Continuous cultivation of a single crop (monoculture) over years at the same site cause s accumulation of a particular group of microbes whic
Explain Light source - Pre-requisites of Colour Perception No colour may be detected by the eyes or by an instrument in the dark i.e. in the absence of a light source emitti
Theories of evolution of man Towards the beginning of the nineteenth century, scientists had already started doubting the theory of special creation and various attempts were
Explain the Medulla Oblongata The medulla extends from the pons above and is continuous with the spinal cord below as can be seen in Figure. It is about 2.5 cm long shaped like
Neanderthals: These were the first human like fossils found. The Neanderthals existed throughout western Europe and across into the near east and central Asia from about 10
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