1.

Which of the following adds/add nitrogen to the soil?1. Excretion of urea by animals2. Burning of coal by man3. Death of vegetationSelect the correct answer using the codes given below.

A. 1 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3
Answer» D. 1, 2 and 3


Discussion

No Comment Found