question_answer

  Disscuss why pesticides are used in very accurate concentration and in very appropriate manner?     Name two types of animal feed and write their functions.      

Answer:

                  Pesticides are used in very accurate concentration and in a very appropriate manner, because if used in excess it (i) harms the soil and causes loss of fertility. (ii) checks the replensihment of organic matter. (iii) kills the microorganism of the soil. (iv) causes air, water and soil pollution. (v) passes into ground water and make it toxic biota. (vi) enter the crop plants and make them toxic. (vii) pass into surface water and harm the aquatic organisms.                                     (5)