7. Why might it be more

accurate to calculate using only

arable land?

It would be more accurate to calculate using only the arable land because only the arable can be surely said to be suitable for the cultivation of crops.

Explanation:

It is preferable to calculate the amount of agricultural yield that can be obtained from a specific area by taking into consideration only the land that is arable because the land other than arable land cannot guarantee the expected produce as it is not deemed to be suitable for farming. Arable land guarantees the expected produce owing to the fertility of the soil and the nutrients present in it that are crucial for the crop to thrive.