SELECT * FROM question_mgmt as q WHERE id=4306 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=8 AND subId=16 AND chapterId=195 and ex_no='6' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 9th science Improvement in Food Resources why should preventive measures and biological cont

Question:

Why should preventive measures and biological control methods be preferred for protecting crops?

Answer:

Preventive measures and biological control methods should be preferred for protecting crops because these methods are safe ecologically and do not harm other life forms. These chemicals are also poisonous for plants and animals. Excessive use of chemicals can lead to many environmental problems and cause pollution. Preventive measures include proper soil and seed preparation, timely sowing of seeds, intercropping and mixed cropping, usage of resistant varieties of crops, etc. On the other hand, biological control methods include the usage of bio-pesticides that are less toxic for the environment. An example of bio-pesticides is Bacillus thuringiensis, which is an insect pathogen that kills a wide range of insect larvae . Hence , these are completely safe for other life forms.


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