LIFE SCIENCE

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

Detailed explanation-2: -Solar energy is created by nuclear fusion that takes place in the sun. Fusion occurs when protons of hydrogen atoms violently collide in the sun’s core and fuse to create a helium atom. This process, known as a PP (proton-proton) chain reaction, emits an enormous amount of energy.

Detailed explanation-3: -Sunlight is a food resource because photosynthetic organisms require sunlight to make their own food. Green plants, some protists and bacteria use a pigment called chlorophyll to capture light energy from the Sun and use it to transform carbon dioxide into the sugar glucose.

Detailed explanation-4: -The vast majority of energy that exists in food webs originates from the sun and is converted (transformed) into chemical energy by the process of photosynthesis in plants.