Knowledge of how cells work is vital to understanding the way in which an organism works. Every cell carries out processes essential to the life of the organism. Photosynthesis is a chemical reaction that takes place in plants. It is necessary for the existence of life on Earth. It maintains oxygen levels in the atmosphere and produces glucose. Animals use plants for food. Respiration is a chemical reaction that takes place in the cells of all living things, providing them with the energy to survive.
Photosynthesis and Respiration
Every second, the cells of a living organism carry out processes which are vital to ensure the organism’s survival. Plant cells produce glucose during a process called photosynthesis and all living cells obtain energy from glucose during a process called respiration.
8.1 Photosynthesis
Chlorophyll Green pigment contained in the chloroplasts of plant cells.
Glucose A simple sugar molecule produced by photosynthesis.
Photosynthesis is the process by which plants make their own food. It occurs in the chloroplasts of plant cells. Chloroplasts are found inside the cells in the green parts of plants, such as the leaf or stem. Chloroplasts are green structures that contain a chemical called chlorophyll. Photosynthesis produces glucose and oxygen using light energy from the sun, water from the soil and carbon dioxide from the air. The glucose produced is either used immediately for energy or else stored as starch. Oxygen is either used for plant respiration or released into the air. Photosynthesis converts light energy into chemical energy.
