Physics
Grade-10
Easy

Question

Which of the following is true about the plant remains as a source of energy?

  1. Clean, safe & expensive
  2. Available, cheap
  3. Infinite, clean & hot
  4. All are correct

hintHint:

Plant remains, including tiny seeds and pieces of wood charcoal etc.

The correct answer is: Available, cheap


    • Plant remains, including tiny seeds and pieces of wood charcoal, are separated from the soil through the process of flotation. Flotation involves putting a small amount of soil into a container of water. The heavier soil and rocks sink to the bottom. Lighter plant remains float.
    • Plant remains are available and are cheap.

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