Organisms with (1) ____ like plants can produce food for themselves through the process of (2) . These organisms capture (3) energy from the sun and convert it to (4) _ energy stored in food. The food-manufacturing process primarily takes place in the organelle called (5) _. There are two stages of this process. The (6) occurs in the presence of the sunlight which takes place in the (7) . The next stage is known as the (8) _ which can occur even without sunlight and takes place in the (9) _. The factors that affect the rate of photosynthesis include (10) ____, amount of carbon dioxide, water, and light.

All living organisms on earth consist of one or more cells. Each cell runs on the chemical energy found mainly in carbohydrate molecules (food), and the majority of these molecules are produced by one process: photosynthesis. Through photosynthesis, certain organisms convert solar energy (sunlight) into chemical energy, which is then used to build carbohydrate molecules. The energy used to hold these molecules together is released when an organism breaks down food. Cells then use this energy to perform work, such as cellular respiration.

The energy that is harnessed from photosynthesis enters the ecosystems of our planet continuously and is transferred from one organism to another. Therefore, directly or indirectly, the process of photosynthesis provides most of the energy required by living things on earth.

Photosynthesis also results in the release of oxygen into the atmosphere. In short, to eat and breathe, humans depend almost entirely on the organisms that carry out photosynthesis.