The plants of which of the following crops are highly sensitive to frost?

The correct answer is: A. Barely

Barley is a cereal grain that is highly sensitive to frost. Frost can damage the leaves and stems of barley plants, making them more susceptible to disease and pests. In severe cases, frost can kill barley plants outright.

Cotton and maize are less sensitive to frost than barley. However, frost can still damage these crops, especially if it occurs early in the growing season.

None of the above is not the correct answer because barley is the only crop listed that is highly sensitive to frost.

Here are some additional details about the sensitivity of barley to frost:

• Barley plants are most sensitive to frost when they are young and actively growing.
• Frost can damage the leaves and stems of barley plants, making them more susceptible to disease and pests.
• In severe cases, frost can kill barley plants outright.
• Farmers can protect barley crops from frost by planting them in areas that are less likely to experience frost, or by using frost protection measures such as row covers or windbreaks.