Question

The ultimate source of our energy is

• A. Sun
• B. Plant
• C. Electricity
• D. Wind

Answer 1

The correct option is A

Sun

The correct option is option A.

Explanation of the correct answer:

1. Sun is the ultimate source of energy on earth which leads to the origin of other energy such as wind energy, hydro energy, and geothermal energy.
2. The sun emits electromagnetic radiation, which travels through space and reaches our earth.
3. The electromagnetic waves emitted by the sun make up a large spectrum of different wavelengths called the visible spectrum.
4. The waves transferring the heat to the earth are infrared rays that transfer electromagnetic energy from sun.
5. The energy from the earth is obtained in the form of heat that is absorbed by green plants to convert it into chemical energy called photosynthesis.
6. Through photosynthesis, green plants prepare food that is eaten by animals so energy from green plants is transferred to animals by the food chain.
7. Sun is the ultimate source of energy on earth which leads to the origin of other energy such as wind energy, hydro energy, and geothermal energy
8. Wind energy is generated due to the movement of wind and the emission of heat by the sun.
9. Similarly, the energy generated from water is the extraction of the kinetic energy and potential energy of water that comes from solar energy

Explanation of the incorrect options:

Option B:

1. Plants are the most important component of the environment.
2. Green plants prepare food by photosynthesis that is eaten by other living organisms.
3. Through photosynthesis, oxygen is released into the atmosphere which is consumed by animals.
4. Plants occupy a special place in the environment, they provide us with food, oxygen, medicines, and fodder.

Option C:

1. Electricity is a form of energy that is generated by the motion of electrons.
2. Electricity is obtained by the conversion of different sources of energy such as coal, natural gas, and oil.

Option D:

1. The movement of air called wind is caused by differences in pressure and atmosphere.
2. The air flows from regions of high-pressure differences to low pressure, the greater the pressure differences, the faster the wind flows.

Final Answer: the ultimate source of our energy is sun.