The residue left after methane production from cattle dung is:
a. burnt
b. buried in landfills
c. used as manure
d. used in civil construction
The answer is option (c) used as manure.
Explanation: After methane is extracted from cattle dung, the leftover material remains nutrient-rich and can be used as a fertilizer, making it an excellent manure for plants. Some points to keep in mind: