History of Selective corn breeding Labaids C 42-44

What is the largest use of corn in the United States?

• Human consumption

• Feed for livestock

• Corn-based biofuel

• Export

In 2018, how many acres of corn were planted by U.S. farmers?

• 50 million acres

• 70 million acres

• 90 million acres

• 110 million acres

What is the native region of the wild grass teosinte?

• Europe

• Asia

• Southern Mexico and parts of Central America

• Australia

What percentage of U.S. corn is used for ethanol production?

• 10.5%

• 24.7%

• 35.2%

• 45.9%

What is one key difference between teosinte and modern corn?

• Teosinte produces few seeds with hard outer covering

• Modern corn has a hard outer coating on its seeds.

• Teosinte kernels are softer and sweeter than modern corn kernels.

• Modern corn produces ears with a few seeds.

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Why did people start farming teosinte?

• To use it as a type of baby powder.

• To produce new plants with desirable traits.

• To make chewing gum.

• To create a new type of fruit.

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What is one reason farmers selected certain plants over the centuries?

• To make the plants grow shorter.

• To produce plants that could withstand drought.

• To create plants with fewer kernels.

• To make the plants grow slower.

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What was one reason farmers developed corn plants with low moisture in their kernels?

• To increase the sweetness of the corn

• To make them less likely to rot in winter

• To make them grow faster

• To change their color

By the middle of the 20th century, what type of pollination began to show much higher yields?

• Open pollination

• Controlled pollination

• Natural pollination

• Cross pollination

What is a genome?

• A type of corn plant

• A map of an organism's genetic material

• A method of pollination

• A type of fertilizer

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