Life Processes-1 Nutrition, Transportation and Excretion — Flashcards

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Nutrition is the process by which living beings obtain food, change food into simple absorbable forms, and use it to make substances needed by the body.

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Food provides energy for life processes, helps in growth and repair of worn-out cells and tissues, and helps in the production of enzymes and hormones.

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The two main types are autotrophic nutrition and heterotrophic nutrition. Green plants, algae and some bacteria are autotrophs, while organisms that depend on others for food are heterotrophs.

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Holozoic nutrition includes ingestion, digestion and absorption of food. Parasitic and saprotrophic nutrition do not require these three processes.

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Cuscuta or Dodder plant (Amar bel) is a parasite on green plants. It takes food from the host plant and depends on it for nutrition.

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Saprotrophs feed on dead and decaying organic matter and help in cleaning the environment by decomposing it.

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Green plants make food by photosynthesis, a biochemical process in which carbon dioxide and water are used in the presence of sunlight and chlorophyll. Oxygen is released as a by-product.

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6 CO2 + 12 H2O → C6H12O6 + 6 H2O + 6 O2 ↑…