In case of which one of the following biogeochemical cycles, the weathering of rocks is the main source of release of nutrient to enter the cycle?

Which one of the following is NOT an example of biomass energy source?

Which one of the following is NOT a reason of decrease in biodiversity?

Which one among the folowing is a non-conventional source of energy?

Which of the following material is biodegradable?

Which one of the following is not a main greenhouse gas ?