With reference to the usefulness of the by-products of sugar industry, which of the following statements is / are correct?
1. Bagasse can be used as biomass fuel for the generation of energy.
2. Molasses can be used as one of the feedstocks for the production of synthetic chemical fertilizers.
3. Molasses can be used for the production of ethanol.
Select the correct answer using the codes given below.

Consider the following animals:
1. Sea cow
2. Sea horse
3. Sea lion
Which of the above is/are mammal/mammals?

Recombinant DNA technology (Genetic Engineering) allows genes to be transferred
1. across different species of plants 
2. from animals to plants 
3. from microorganisms to higher organisms 
Select the correct answer using the codes given below. 

Which of the following is called the laughing gas?

Nose starts bleeding when one climbs up mountain due to

Gobar gas mainly contains