1. Why do organisms take food?
2. Distinguish between a parasite and a saprotroph.
3. How would you test the presence of starch in leaves?
Answers
Answer:
(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, circulation of blood, and reproduction. To perform all these life processes the organism needs energy and nutrients.
(2) 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. saprotrophs are orgnisms that obtain nutrition from dead and decaying organic matter. Examples: Fungi and some bacteria.
(3) Starch testing
Iodine solution is used to test leaves for the presence of starch. ... heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions) heat it in boiling ethanol for a few minutes (this removes most of its colour)
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