Growing two or more crops on the same piece of land in one year is called

Correct option is D

Correct answer – (d) Multiple cropping refers to growing more than one crop on the same land in a year. It increases cropping intensity and land productivity. Therefore, it is called multiple cropping.
Information Booster / Facts Cropping intensity increases when multiple cropping is adopted. Examples: rice–rice–pulse, maize–wheat.
Why other options are incorrect (a) Intercropping means simultaneous growing in the same season. (b) Mixed cropping is mixture without fixed row arrangement. (c) Mono cropping means only one crop repeatedly.