In view of the current food crisis, it is said, that we need another green revolution. Highlight the major limitations of the earlier green revolution.
Limitations of green revolution :
$(i)$ The Green Revolution succeeded increases the food supply but, yet it was not enough to feed the growing human population.
$(ii)$ Increased yields have partly been due to the use of improved crop varieties, but mainly due to the use of better management practices and use of agrochemicals (fertilisers and pesticides).
$(iii)$ However, for farmers in the developing world, agrochemicals are often too expensive, and further increases in yield with existing varieties are not possible using conventional breeding.
$(iv)$ Use of agrochemicals causes eutrophication in aquatic ecosystems and biomagnification in terrestrial ecosystems.
$(v)$ Water logging and soil salinity are some of the problems that have come in the wake of green revolution
$RNA$ interference involves
$A$......... infects the roots of tobacco plants which reduce the production of tobacco.
Cultivation of $Bt$ cotton has been much in the news. The prefix $Bt$ means
What is meant by the term bio-pesticide ? Name and explain the mode of action of a popular biopesticide.
Compare and contrast the advantages and disadvantages of production of genetically modified crops.