1. Materials of biological origin which is commonly used to maintain soil fertility is
A. bordeaux mixture.
B. suphala.
C. compost.
D. urea.

compost

Explanation:

Among the choices mentioned above, it is only "compost" that is biological in origin. That's because it came from organic waste products that were decomposed; thus the name "compost."

Compost consists of essential nutrients (phosphorus, nitrogen and potassium) ideal for fertilizing the soil. This is often added to the soil and used in gardening and farming. It also aids in plant's immunity by resisting plant diseases.

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