2. Distinguish between a parasite and a saprotroph.
3. How would you test the presence of starch in leaves?
Answers
Answer:
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.
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 (this stops its chemical reactions) heat it in boiling ethanol for a few minutes (this removes most of its colour)
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Answer:
Q. A parasite is a heterotrophic organism that derives its nutrition directly from a host organism, whereas, a saprotroph is another type of heterotrophic organism that derives its nutrition by ingesting dead and decaying matter that surrounds them.
Examples:
Parasite - Leech; they stick onto an organism and suck blood from their host
Saprotroph - Fungi; they secrete digestive juices on dead matter, convert the matter into a soluble form and then ingest it.
Q. The presence of starch in leaves can be tested by the Iodine test. When we remove chlorophyll from the leaf by boiling it in alcohol and then put two drops of iodine solution, it is colour change to blue indicates the presence of starch.
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