Is the "pineapple yield per hectare" discrete or continuous? Why?
In principle it is discrete (you don't harvest partial pineapples).
But since the number of pineapples per hectare is a large number, it is usually considered continous, as the difference between one number and the next (say 1000 and 1001) is a small percentage of the number itself.
Compare with height or weight. These are obviously continuous variables, but they are measured and recorded in discrete units (inches or centimeters).