Quarantine regulation is meant for
Preventing entry of diseased plants in the country
Spraying diseased plants with insecticides
Promoting dry farming
Growing fruit trees in all the states
$(a)$
Which one of the following is being tried in India as a bio-fuel substitute for fossil fuels?
$DDT$ was first synthesized by
Bordeaux mixture was first used in:
Green manuring enhances crop yield by
In maize, hybrid vigour is exploited by
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