How does photosynthesis connect to energy transfer in ecosystems?

How does photosynthesis connect to energy transfer in ecosystems?

• A. Photosynthesis captures light energy and stores it as chemical energy in glucose.
• B. Energy from glucose is released as heat during photosynthesis.
• C. Oxygen released during photosynthesis is used by all organisms for energy.
• D. Sunlight is stored in chemical bonds of oxygen.

Answer: (A)

The main idea is how energy from sunlight becomes chemical energy that organisms can use and how that energy moves through ecosystems. In photosynthesis, plants capture light energy and drive a chemical reaction that converts carbon dioxide and water into glucose, storing energy in the chemical bonds of glucose. That stored energy can then be passed on when plants are eaten by herbivores and, in turn, by other consumers, enabling growth, movement, and all life processes along the food chain. Some energy is always lost as heat at each transfer, which is why energy decreases at higher trophic levels. The statement about oxygen being used by all organisms for energy isn’t accurate, since oxygen is a byproduct of photosynthesis and is only used by organisms that rely on cellular respiration; also, the energy from sunlight is stored in glucose, not in oxygen.

The main idea is how energy from sunlight becomes chemical energy that organisms can use and how that energy moves through ecosystems. In photosynthesis, plants capture light energy and drive a chemical reaction that converts carbon dioxide and water into glucose, storing energy in the chemical bonds of glucose. That stored energy can then be passed on when plants are eaten by herbivores and, in turn, by other consumers, enabling growth, movement, and all life processes along the food chain. Some energy is always lost as heat at each transfer, which is why energy decreases at higher trophic levels. The statement about oxygen being used by all organisms for energy isn’t accurate, since oxygen is a byproduct of photosynthesis and is only used by organisms that rely on cellular respiration; also, the energy from sunlight is stored in glucose, not in oxygen.