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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.
Photosynthesis: Carbon dioxide + water + solar energy + minerals -> food + oxygen Food made during photosynthesis may later be used for energy by the plant itself, or by a
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Q. Mention the different methods of wheat milling? Three methods of wheat milling are stone milling, roller milling and fragmentation milling.
ecological characteristics of deserts
Explain the Chemical Weathering Processes The chemical process of decomposition starts with the physical disintegration of rocks and minerals. In chemical weathering processes
Lifting things with compressed air Remove the bladder from a soccer ball or basket ball and place it on a table. Pile some books on the bladder and then blow into it.
Ethical issues concerning use of animals for experimentation and educational purposes (i) Animals procured, handled and looked after according to the regulatory principles laid
Explain what Diffusion is? Diffusion, we learnt is a simple process of movement of individual molecules from one region to another. Figure illustrates passive transport where m
Observing sun spots Use the telescope that you made in a last experiment. Set it up so that it points directly at the sun and focus it so that a clear and bright image of the s
Determine the Pathways of Weathering Weathering and soil development proceed almost simultaneously in case of soft rocks, whereas in case of hard rocks weathering precedes soil
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