Question

high - yielding crops were plants specifically bred to respond to fertilizers; without fertilizers, they could not grow. for example, high - yield wheat varieties produced more grain per acre than traditional wheat plants. the seeds of high - yielding crops were larger, able to photosynthesize more efficiently, and able to grow even in places with limited sunlight. in addition, high - yielding crops meant that large varieties of crops were no longer necessary. prior to the green revolution, thousands of varieties of a particular crop were being grown. pesticides were used to prevent disease and pests that may harm high - yielding crops.
what is the benefit of high - yield crops?
crops are larger and able to produce more grain per acre.
they increase the variety of crops needed to be produced.
they do not require the use of fertilizer.
they reduce the plants need to photosynthesize.

Explanation:

The text states that high - yielding wheat varieties produced more grain per acre than traditional wheat plants. This directly relates to the first option. The second option is incorrect as the text says that prior to the green revolution (which introduced high - yielding crops), there were thousands of varieties, implying a reduction in variety with high - yielding crops. The third option is wrong because the text clearly mentions that high - yielding crops need fertilizers. The fourth option is incorrect as the text says high - yielding crops' seeds can photosynthesize more efficiently, not that they reduce the need for photosynthesis.

Answer:

Crops are larger and able to produce more grain per acre.