You will now listen to part of a lecture. You will then be asked a question a

Today, let’s talk about selective breeding. In order to improve the quantity and quality of crops, ancient farmers kept crop seeds that had desirable characteristics to breed. Smart, isn’t it? Time after time, the seed’s quality was improved.
Let’s take wheat as an example. When wheat first ripens, the grain easily falls down on the ground and makes it really difficult for farmers to gather. However, there is other wheat which doesn’t fall off and makes it easy to gather. Farmers chose to keep the seeds of the breeds that don’t easily drop the grain. After many years, none of the wheat falls to the ground and this facilitates the gathering of the grain. Another example is the pea plant. Originally, pea plants had very small peas which were not large enough to feed people. Later, farmers chose the seeds from the plants that had larger peas to breed. Finally, the peas got much bigger and could be used as food for people.