4.Distinguish between a parasite and a saprotroph. 5.what are villi? Where are they located and what is their function.
Answers
1)
Parasite :
an organism that lives in or on an organism of another species (its host) and benefits by deriving nutrients at the other's expense.
Saprotroph:
an organism that feeds on or derives nourishment from decaying organic matter.
2)
Villi :
The tiny projections on the inner surface of the small intestine which help in absorbing the digested food are called villi. These helps to increase the surface area of intestinal walls.
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Answer:
4.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.
5.Villi are small finger-like projections located in the walls of the small intestine. Their function is to increase the surface area in order to maximise the absorption of digested food. ... Each villus has a muscle strand which allows the villi to contract and expand