By which of the following methods, new and better varieties of plants can be formed?
Selection
Grafting
Hybridization
Hybridization followed by selection
Which one of the following is being utilized as a source of biodiesel in the Indian countryside?
The infectious agents made up of $RNA$ only are
Free living nitrogen fixing bacteria can bring about saving of nitrogen fertilizer to the tune of
Eutrophication is due to
$LSD$ is obtained from