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Practical: Study of Nostoc

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 Practical: Study of Nostoc Nostoc is a filamentous, photosynthetic cyanobacterium. It commonly occurs in freshwater, moist soil, wet rocks and other damp habitats. Colonies are usually gelatinous because numerous filaments remain embedded in a mucilaginous matrix. Materials Required Fresh or preserved Nostoc material, clean glass slide, cover slip, dropper, dissecting needle, water, blotting paper and compound microscope. Procedure Take a small quantity of Nostoc colony with the help of a dissecting needle and place it on a clean glass slide. Add one or two drops of water and gently tease the material so that the filaments become separated. Place a cover slip carefully over the material without trapping air bubbles. Remove excess water with blotting paper. First observe the preparation under low power and then under high power of the compound microscope. Observations The plant body of Nostoc is thalloid and usually forms a soft, jelly-like colony. A colony contains numerous ...
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ENVIRONMENTAL POLLUTION

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 Pollution of the natural environment is not a new problem, but it continues to be a leading environmental cause of illness and premature mortality worldwide. Such chemicals include plastics, heavy metals, and others that have been discharged into the environment and then remain there. It is not biodegradable and is detrimental to all forms of life. Human activity is a major contributor to environmental pollution since toxins come from somewhere, travel long distances by air or water, and end up in the ground. Despite widespread concern, people are still suffering from pollution's aftereffects. Human activities continue to be the leading cause of air pollution, which is steadily increasing. Pollutants in the environment may be found almost everywhere because of the numerous human activities that release them. Let's break down the various forms of pollution that affect our planet. Various Sources of Pollution Injurious effects on living things—including humans—caused by unintend...
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