Explanation by: Admin

In most ecosystems, the primary source of energy is the sun. Through the process of photosynthesis, plants, algae, and some bacteria convert solar energy into chemical energy, which is stored in the form of glucose. This energy is then passed through the food chain as organisms consume plants or other organisms for nourishment.

Here’s why the other options are incorrect:

  • (A) Water: While water is crucial for life and photosynthesis, it does not provide the primary source of energy for ecosystems.
  • (B) Carbon dioxide: Carbon dioxide is important for photosynthesis, but it is not a direct source of energy.
  • (D) Soil: Soil provides nutrients, but it is not the primary source of energy in ecosystems.

Thus, the sun is the ultimate source of energy in most ecosystems.

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