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Nutrition PowerPoint Presentation

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Description : Some organism use simple food obtained from inorganic sources in the form of carbon dioxide and water.

Tags : nutrition,food,autotrophic nutrition,heterotrophic nutrition,nutrition in human being

Published on : Sep 09, 2022 | Views : 1698 | Downloads : 2

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Nutrition
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How do living things get their food? Some organism use simple food obtained from inorganic sources in the form of carbon dioxide and water. These organism, the autotrophs, include green plants and some bacteria. Other organism utilise complex substances. These complex substance have to be broken down into simpler ones before they can be used for the unkeep and growth of the body. To achieve this, organisms use bio-catalysts called enzymes. Thus, the heterotrophs survival depends directly or indirectly on autotrophs. Heterotrophic organisms include animals and fungi.
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Autotrophic Nutrition Autotrophic organism are fulfilled by photosynthesis. It is the process by which autotrophs take in substances from the outside and convert them into stored form of energy. This material is taken in the form of carbon dioxide and water which is converted into carbohydrate in the presence of sunlight and chlorophyll.
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Process of photosynthesis in plants- Absorption of light energy by chlorophyll. Conversion of light energy to chemical energy and splitting of water molecules into hydrogen and oxygen. Reduction of carbon dioxide to carbohydrate.
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Heterotrophic Nutrition Heterotrophic nutrition is a mode of nutrition in which organisms depend upon other organisms for food to survive. They can't make their own food like Green plants. Heterotrophic organisms have to take in all the organic substances they need to survive.
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How do organisms obtain their nutrition In single-celled organisms, the food may be taken in by the entire surface. For example: Amoeba takes in food using temporary finger-like extensions of the cell surface which fuse over the food particle forming a food-vacuole. Inside the food-vacuole, complex substances are broken down into simpler ones which then diffuse into the cytoplasm. The remaining undigested material is moved to the surface of the cell and thrown out.
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Nutrition in human beings Naturally the food has to be processed to generate particles which are small and of the same texture. e. This is achieved by crushing the food with our teeth. Since the lining of the canal is soft, the food is also wetted to make its passage smooth. When we eat something we like, our mouth ‘waters’. This is actually not only water, but a fluid called saliva secreted by the salivary glands. If it is to be absorbed from the alimentary canal, it has to be broken into smaller molecules. This is done with the help of biological catalysts called enzymes.
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