Civil Services Examination · Question 51

Read the following passage and answer the item that follows. Your answer should be based solely on the passage. Passage: It is hard to predict how changes in the climate and the atmosphere's chemistry will affect the prevalence and virulence of agricultural diseases. But there is a risk that such changes will make some plant infections more common in all climatic zones, perhaps catastrophically so. Part of the problem is that centuries of selective breeding have refined the genomes of most high-value crops. They are spectacular at growing in today's conditions but genetic variations that are not immediately useful to them have been bred out. This is good for yields but bad for coping with changes. A minor disease or even an unknown one could suddenly rampage through a genetically honed crop. Which one of the following statements best reflects the central idea conveyed by the passage?

1. AGlobal climate change adversely affects the productivity of crops.
2. BOur total dependence on genetically honed crops entails possible food insecurity.
3. COur food security should not depend on agricultural productivity alone.
4. DGenetically honed crops should be replaced with their wild varieties in our present cultivation practices.