Which of the following is not true concerning cover crops?
a. they prevent soil erosion
b. they can fix nitrogen in soil
c. they are sold as cash crops
d. they add organic matter to soil

The correct option is C.

Cover crops are those crops that are grown majorly for the protection and enrichment of the soil. Cover crops has the following advantages: they increase the fertility of the soil, they prevent erosion and they improve the quality of the soil. Cover crops can also be used to control agricultural pests and diseases. Cash crops are those crops that are cultivated purposely for profits. Examples are cocoa, rubber, coffee, etc. These are not cover crops.

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