Question no 4204 SSC CGL Tier 1 English Comprehension Questions and Answers Online Test 97

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1 .

Soil scientists have shown that soil teems with millions of living, things, many of them useful, others harmful. The living things which are useful include earthworms and various kinds of bacteria. Earthworms loosen the soil and so enable air and water to enter it. Bacteria, which are microscopic living thing break down dead plants and animals and make humus, or take ni trogen f rom t he ai r and change it int o substances that plants use. The living things that do harm incldude other bacteria and fungi which cause diseases. Other harmful things are pests such as wire worms which feed on the roots of grass and other plants. While the farmer can usual l y keep weeds in check by care ful cultivation, this alone may not protect his crops from insects, pests and diseases. Nowadays, however, he is much better able to control these enemies. He may plant specially resistant types of seeds or he may keep the pests and diseases in check with chemicals. With better seeds farmers have been able to increase their crop yields. They can grow crops that ripen more qui ckly and have a stronger resistance to disease, frost or drought.
Scientists who study soil believe that

[ A ] all insects and bacteria are harmful
[ B ] only microscopic living things are useful
[ C ] only earthworms are useful
[ D ] not all worms and bacteria are harmful

Answer : Option D

Explanation :

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