Cultivation of more fuel wood trees is known as

Petroplants were first recognized by

The most common biofuel being used nowadays is:

Major autotrophic biomass in oceans is contributed by

Observe the figures $A$ and $B$ given below and answer the following questions.
$(i)$ The power generation by the above two methods is non-polluting. True/False.
$(ii)$ List any two applications of solar energy.
$(iii)$ What is a photovoltaic cell?

The black wood tree of India is