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The most abundant source of energy is:
A. Oil
B. Biomass
C. Coal
D. Sun

Answer
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Hint: Plants, algae, and cyanobacteria use the energy from sunlight to convert carbon dioxide and water into organic matter. Carbohydrates provide the majority of the calories in the human diet. Specific metabolism of dietary carbohydrates in different tissues, glycogen, is the physiological disposal of dietary carbohydrates. Energy is required for organisms to survive, evolve, react to stimuli, replicate, and carry out all other biological processes.

Complete answer:
Option A: Every nonpolar organic fluid that is a viscous liquid at room temperature that is both hydrophobic and lipophilic is referred to as an oil. Oils are flammable and surface active due to their high carbon and hydrogen content. At room temperature, most oils are unsaturated lipids that are liquid.
So, option A is incorrect.
Option B: Photosynthesis is a mechanism by which plants fix solar energy to generate biomass. This biomass goes through a series of loops, yielding a variety of energy sources. Fodder for animals that grow dung, agricultural waste for cooking, and so on.
So, option B is incorrect.
Option C: Coal is a combustible black or brownish-black sedimentary rock found in seams. Coal is mostly made up of carbon, with varying concentrations of other elements such as hydrogen, Sulphur, oxygen, and nitrogen. Coal is used in the production of iron and steel, as well as other manufacturing processes.
So, option C is incorrect.
Option D: The principal source of energy is the sun. Sunlight is a nonpolluting, green energy source. It is a renewable resource, ensuring it will not deplete with time and can be sustained because the sun shines almost every day. Coal and gas are not green or sustainable; if they are gone, they are gone forever. Solar, wind, geothermal steam, and other clean, renewable energy sources are becoming increasingly popular. It's known as 'Green Power’.
So, option D is correct.

Hence, Option D is the correct answer.

Note:
To carry out their life cycles, all living beings need electricity. Energy is the desire to do work or make improvement, as you heard earlier in the chapter about enzymes. Many procedures that may be required are common to you or have been taught to you. The majority of our energy comes from fossil fuels, with nuclear power and renewable energy sources filling out the picture. The Sun, our nearest star, is the source of the majority of these sources. Since electricity is an energy carrier rather than a primary source, it has its own category. For animals and the environments in which they live, the Sun is the primary source of light.
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