The correct answer is option 'A', Yield.

Yield refers to the measurement of the amount of crop produced on a given piece of land during a single season. It is an important metric in agriculture as it helps farmers and policymakers assess the productivity of their land and make informed decisions regarding crop production.

Yield can be measured in various units such as kilograms, bushels, or tons per unit area (e.g., per hectare or acre). It is typically calculated by dividing the total crop output by the total land area under cultivation.

Now let's understand the other options and why they are not the correct answers:

b) Productivity: Productivity refers to the efficiency with which resources (such as land, labor, capital, and technology) are utilized to produce goods or services. While crop yield is one aspect of productivity, it also encompasses other factors such as input efficiency, sustainable practices, and overall output value.

c) Cultivation: Cultivation refers to the process of preparing and working the land for agricultural purposes. It involves activities like plowing, planting, watering, fertilizing, and harvesting. While cultivation is necessary for crop production, it does not specifically measure the crop produced in a single season.

d) Output: Output refers to the total amount of goods or services produced by a system or process. While crop yield can be considered as a measure of output, it specifically refers to the crop produced on a given piece of land during a single season. Therefore, yield is a more specific term for measuring crop production.

In conclusion, the term used for measuring crop produced on a given piece of land during a single season is yield. It is an important metric in agriculture and helps in assessing the productivity and efficiency of crop production.