Cell Energy

Energy from the sun Plants use the sun’s energy to make sugar. The sugar is called “glucose”. Glucose is stored in the plant and used by the plant for food.

Energy from the sun… Photosynthesis – the process by which plants use the sun’s energy to make sugar. Occurs in the chloroplasts. Chloroplasts contain a pigment called chlorophyll – molecules that absorb light energy

Energy from the sun… Photosynthesis: occurs in plants uses carbon dioxide, water, and energy produces oxygen and sugar CO 2 + H 2 O + energy C 6 H 12 O 6 + O 2 carbon dioxide watersugaroxygen

Energy from food Cellular respiration – process by which cells use oxygen to produce energy from food Food (glucose) is broken down to carbon dioxide, water and energy (ATP) This takes place in the mitochondria

Energy from food Respiration occurs in animals uses sugar and oxygen produces water, carbon dioxide and energy C 6 H 12 O 6 + O 2 CO 2 + H 2 O + ATP carbon dioxide water sugaroxygen energy

Energy from food Fermentation – process by which cells break down food into energy without using oxygen Animal cells use fermentation when oxygen is not available Fermentation produces lactic acid Bacteria and yeast use fermentation