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Answers
1. Organisms need to take food to get energy and perform life processes. A living organism undergoes many life processes like nutrition, respiration, digestion, transportation, excretion, blood circulation, and reproduction. To perform all these life processes, the organism needs energy and nutrients.
2. Parasite- Parasites are organisms that depend upon another organism (host) for food and cause harmful effects or dieseases to the host. Examples: Cuscuta (Amarbel), mosquitoes and head lice.
Saprotrops- saprotrophs are orgnisms that obtain nutrition from dead and decaying organic matter. Examples: Fungi and some bacteria.
3. Iodine solution is used to test leaves for the presence of starch. You need to: heat a plant leaf in boiling water for 30 seconds , heat it in boiling ethanol for a few minutes.
4. The process of synthesis of food in green plants is called photosynthesis. This process takes place in the cells containing the green pigment chlorophyll. The raw materials for this process are water, carbon dioxide and sunlight. Carbon dioxide from air is taken in through the stomata present on the leaf surface.
5. (Picture given above)
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