AP BIOLOGY

Detailed explanation-1: -The solar energy captured by the leaves is used to make food which is stored in the plant. All organisms are directly or indirectly dependent on plants for their food. Thus, the sun is the ultimate source of energy for all living organisms.

Detailed explanation-2: -In most ecosystems, the ultimate source of all energy is the sun.

Detailed explanation-3: -Sunlight is essential for photosynthesis. Sunlight provides energy for the reaction between carbon dioxide and water to produce glucose and oxygen. Hence solar energy is considered as the ultimate source of energy.

Detailed explanation-4: -One of the most important sources of energy is the sun. The energy of the sun is the original source of most of the energy found on earth. We get solar heat energy from the sun, and sunlight can also be used to produce electricity from solar (photovoltaic) cells.