Question

Mention any two ways in which cow dung can be utilised as a fuel. Out of two which is better? Justify. (2 marks)
Ans. Cow dung can be used by burning cowdung itself or by burning biogas produced from it. Biogas is more efficient as it's thermal efficiency is higher than that of cow dung. It doesnt contain moisture while cow dung has a lot.
(I got only 1 out of 2 marks)
What should I add?

Answer 1

You could have written it point wise and somemore explanation could be added as it contains 2 mark.

1 mark will be for giving the two uses and other mark will be for brief explanation and writting point wise is better than paragraphs.