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Explain Skin Secretions - External Defence Mechanism
The oil and sweat secreted by sebaceous and soporiferous glands contains fatty and lactic acids, which makes the surface of the skin acidic (pH 3-5). These prevent the organisms from infecting the skin. Some friendly bacteria, which reside on the skin checks growth of microbes to a certain extent. Lysosomal enzymes of the skin have a bactericidal effect. Thus the skin becomes a self-disinfecting organ.
Other visible light hazards : Ordinary, visible light can present a hazard under certain conditions. You can burn paper by focussing the sun's rays using a small magnifying lens.
Biotechnology in agriculture: Production of enough food to meet the demands of an ever-increasing population in the world is a major task and a challenge to agricultural scient
How to make a devil diver (Cartesian diver) Find a tall glass jar with a quite wide mouth. Wrap a few turns of copper wire about the thin part of the rubber bulb from a medicin
Explain the Ureters Ureters, are the two tubes which convey the urine from the kidneys to the urinary bladder. Each tube measures approximately 10 to 12 inches in length. They
Explain the acid/base balance of our blood changes This acid/base balance of our blood changes in response to many things. These include: Diet: the diets that are rich in
Question 1 It is the job of operations managers to convince the stakeholders that the investment in plant and equipment is going to enhance the value of the investments already he
Which is the largest reef? This is the Great Barrier Reef off the northeast corner of Australia.
To study a hailstone When it hails, collect some of the hailstones. Cut them in half and view how the ice of the hailstone has been built up in layers. If you live in a region
make a list of food item used at home .categorize them as healthy food [energy giving, body building and protective food] and unhealthy food [fried and greasy]
Laboratory Safety Codes: BIS has prepared the following three codes (in the form of small books) regarding laboratory safety: i) Code of safety in microbiological laboratories
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