In the Green Revolution, HYV seeds and chemical fertilizers primarily increased which aspects?

• A. HYV seeds increased yields per hectare; chemical fertilizers improved soil fertility and crop production
• B. HYV seeds decreased yields; fertilizers reduced soil fertility
• C. HYV seeds caused more pests; fertilizers had no effect
• D. HYV seeds replaced irrigation; fertilizers replaced seeds

Answer: (A)

The main idea is that the Green Revolution boosted agricultural output by increasing productivity per unit area through improved seeds and nutrient inputs. High-yielding variety seeds are bred to produce much more grain when given adequate nutrients, so they raise yields per hectare. Chemical fertilizers supply essential nutrients that soils often lack, boosting plant growth and overall production. Together, these technologies raised both yields per area and total crop production.

The other statements don’t fit because HYV seeds don’t decrease yields, fertilizers don’t reduce soil fertility or have no effect, and these inputs didn’t replace irrigation or seeds.