Excessive and continuous use of pesticides has resulted in evolution of some new species of pests.

Yes, geographical isolation gradually leads to genetic drift. This may impose limitations to sexual reproduction of the separated population. Slowly the separated individuals will reproduce among themselves and generate new...

(a) They are eco-friendly 

Bacillus thuringiensis products are endotoxin which when ingested and released in the gut of the larvae of insect pest disrupts the insect gut lining thereby killing them.

According to Lamarck, those organs which are used regularly become strong and more developed. On the other hand, those organs which are not used regularly become weak and degenerate ,...

Yes, geographical isolation gradually leads to genetic drift. This may impose limitations to sexual reproduction of the separated population. Slowly the separated individuals will reproduce among; themselves and generate new...

Indiscriminate use of pesticides may result in the degradation of the environment. For example, DDT is an organic pesticide which is used to kill pests in crop fields. When it...

(c) Excessive/ inappropriate use of nitrogenous fertilizers increase the acidity of soil and Leaching of nitrate to the ground water.

(d) The widespread use of pesticides has not waned because the ratio of cost to benefit for the individual agricultural producer has remained in favour of pesticide use.

(c) 1 is not correct as organic farming is not mentioned in the passage. Further the passage justifies the cost benefit to developed countries like USA.  2 is correct. Because of...