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Biology Questions for grade 8?

1)Joshua saw an interesting object under a tree. When he touched it, it changed colour, rolled over and divided into two. Which characteristics of living organisms has the object shown? A) Excretion, movement, growth B) Growth, reproduction, sensitivity C) Movement, reproduction, sensitivity D) Movement, adaptability, reproduction 2) Which of the following processes does not involve diffusion? A) transportation of water up the xylem B) movement of gases in and out of a banana leaf C) spread of yellow coloration from potassium chromate crystals in water D) absorption of dissolved food substances from the small intestine to the bloodstream 3) the roots of plants absorb water through ____ and nutrients by ____ A osmosis, osmosis B osmosis, diffusion C diffusion, diffusion D diffusion, osmosis 4) why are aseptic techniques used for microbiology work? A micro-organisms are tiny B a large number of micro-organisms is needed for each experiment C the techniques ensure that there is no contamination during the experiments D no positive result would be observed if aseptic techniques were not being used 5) What is the key difference between an earthworm and a roundworm? A the earthworm has eyes while the round worm does not B The earthworm has legs while the roundworm does not C the earthworm has a segmented body while the roundworm does not D the earthworm has an anus while the roundworm does not

Public Comments

1. D A c c d
2. C A B C C
3. D - Rolled over - movement Colour change - adaptability divided into two - reproduction D - active process of absorption by the villi A - nutrients and water travel to maintain equivalent concentrations in and out of the root C - without aseptic technique, anything could get into your samples B - look up some pictures if you need confirmation. Hope this helps.
4. 1) When the object changes color, it exhibits adaptability When the object rolls over, it exhibits movement. When the object divides in two, it exhibits reproduction D 2) transporting water up the xylem is called capillary action. There is no diffusion involved. A 3) Roots absorb water through osmosis. Osmosis is the diffusion of water. They obtain nutrients through diffusion. Diffusion is used for everything except water. B 4) aseptic mean extremely clean The only reason for this is to prevent contamination C 5) Earthworms are annelids and have a segmented body. Roundworms do not have a segmented body. C