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6. A disease in which the causative organism is a protozoan and is spread by an insect: a. tuberculosis b. jaundicec. malariad. measles7. Sanjeeda dug two pits, A and B, in her garden. In pit A, she packed some agricultural waste in a polyhtene bag and dumped it in the pit. In pit B, she dumped the same kind of waste but without packing it in a polythene bag. Then, she covered both the pits with soil. After a month, she observed thata. Waste in both pits degraded almost equally.b. Waste in pit B degraded faster than that in pit A.c. Waste in pit A degraded faster than that in pit B.d. Waste in both pits did not degrade at all. |
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Answer» Explanation:1.the disease is spread by mosquitoes which is MALARIA.its a protozoan disease.it is caused beacuse of female anepholes mosquito.>>these mostquitoes have their home in stagnant water and open drums with water.>>they lay many eggs and the larva soon turns to mosquitoes.>.when they bite, the malaria spreads.>.if the same bitten mosquito BITES the healthy person,he will be EFFECTED with malaria.>.we must take many preventive measures like.we must not leave water stagnatedspray kersone in stagnated AREAS...and also COVER drums which contain water with caps..2.sanjeeda dug 2 pits A and B .agriculture waste in polythene bag in Aagriculture waste directly in BSO,waste in pit B degraded faster than pit A.option b is right.>>the waste decomposed fastly as organic materials decompose fastly.plastics take more time decompose/not decompose at all sometimes. |
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