priyankakosaraju wrote:
devikeerthansr wrote:
Nitrobacter, a bacteria living in the roots of bean plants or other legumes, produces fixed nitrogen which is one of the essential plant nutrients and which for non-legume crops, such as wheat, normally, must be supplied by applications of nitrogen-based fertilizer. So if biotechnology succeeds in producing wheat strains whose roots will play host to Nitrobacter, the need for artificial fertilizers will be reduced.
The argument above makes which one of the following assumptions?
A Biotechnology should be directed toward producing plants that do not require artificial fertilizer.
B Fixed nitrogen is currently the only soil nutrient that must be supplied by artificial fertilizer for growing wheat crops.
C There are no naturally occurring strains of wheat or other grasses that have Nitrobacter living in their roots.
D Legumes are currently the only crops that produce their own supply of fixed nitrogen.
E Nitrobacter living in the roots of wheat would produce fixed nitrogen.
Source:Crackverbal
If Nitrogen is not the only nutrient that must be supplied by the artificial fertilizers and some other nutrients must also be by them ,how would use of artificial fertilizers reduce?
Can Someone please explain
Think of it this way. If X is an artificial fertilizer which is primarily used to supply nitrogen (artificially) and other nutrients (such as Calcium etc.) which are not really needed to be absorbed artificially and are rather available in the soil naturally. Thus, upon negating the Option B, even if there are other such fertilizers (such as calcium used in my example), they don't create any reliability on fertilizers or their increased use as they are still available in the soil naturally. Hence, we cannot break the conclusion for sure.
Also take note of the word "essential" used exclusively for nitrogen. That also creates one more possibility that the other nutrients supplied by fertilizer may not be as essential in producing good quality wheat crops (maybe their absence does not have a significant impact).
In assumption questions, we must look for options that break the conclusion totally if they are negated. Even if there is the slightest doubt about the conclusion not being broken, the option choice should not be selected.