AP BIOLOGY

Detailed explanation-1: -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-2: -3.1 The Sun is the major source of energy for organisms and the ecosystems of which they are a part. Producers such as plants, algae, and cyanobacteria use the energy from sunlight to make organic matter from carbon dioxide and water. This establishes the beginning of energy flow through almost all food webs.

Detailed explanation-3: -Sun is the source of almost all the energies in our earth. Plants make food using sunlight, the food that we get from plants and animals also has its prime source as sunlight. The fossil fuels that we use in our daily life comes from dead plants and animals which again have their source as solar energy.