(a) Organic farmers prefer biological control of diseases and pests to the use of chemicals foir the purpose justify
(b) Give example of a bacterium a fungus nand an insect that are used as biocontrol agents

Explanation

(a) chemicla methods often kills both useful and harmful life forms indiscriminately .Eradication of the creaturs that are often described as pests is not only possible but also undesirable , for without them the beneficeal predatory and parasitic insects which depends upon them as food or hosts would not be able to surive .