When a fruit or vegetable (such as strawberries or lentils) is in season, the demand for it will increase as it becomes cheaper.?

Answer: True

According to the law of demand, the demand for a good increases when its price falls. Thus, when a fruit or vegetable is in season, it is relatively less expensive than in off seasons. Thus, consumers buy more of these seasonal fruits in season. Thus, demand for the good increases when it becomes cheaper.

Thus, the statement is true.