How do Cells Obtain Energy Cells of all

How do Cells Obtain Energy? • Cells of all organisms use energy to carry out the chemical activities that allow them to live, grow, and reproduce. • Plants are able to capture light energy from the sun and change it into food through a process called photosynthesis. • The food that plants make supply them with energy and also becomes a source of energy for the organisms that will eat the plants.

PHOTOSYNTHESIS What do you need for Photosynthesis?

PHOTOSYNTHESIS The sun Carbon dioxide from the air A plant Water from the soil

PHOTOSYNTHESIS What does photosynthesis make?

PHOTOSYNTHESIS Oxygen (waste) Food for plant (sugar)

PHOTOSYNTHESIS water + Carbon dioxide sugar +Oxygen

The sun PHOTOSYNTHESIS Oxygen (waste) Carbon dioxide from the air Food for plant (sugar) Water from the soil

PHOTOSYNTHESIS Where does photosynthesis take place?

PHOTOSYNTHESIS vacuole Cell wall nucleus Cell membrane Chloroplasts!!! Plant Cell

Where Does Photosynthesis Take Place? • Chlorophyll in the chloroplasts capture the sun’s energy. • Carbon Dioxide enters the plant through small openings called stomata on the underside of leaves.

Why is this important to us? • We cannot make our own food - so we must get our food from plants. • Plants are the first step in the food chain. • http: //www. ecokids. ca/pub/eco_info/topics/frogs/c hain_reaction/assets/flash/chain_reaction. swf • The oxygen released during photosynthesis is necessary for all living things.

Brain Pop - Photosynthesis http: //www. brainpop. c om/science/cellularlife andgenetics/photosynt hesis/preview. weml http: //www. brainpop. com/sci ence/cellularlifeandgenetics/ photosynthesis/

Getting Energy from Food • The food that you eat has to be broken down so that the energy that it contains can be changed into a form that your cells can use. • Most organisms use cellular respiration to obtain energy from food. • In eukaryotic cells, cellular respiration takes place in the mitochondria

Brain Pop – Cellular Respiration http: //www. brainpop. com/science/c ellularlifeandgenetics/cellularrespir ation/

EQUATION FOR PHOTOSYNTHESIS 6 CO 2 + 6 H 2 O + ENERGY CARBON WATER DIOXIDE light C 6 H 12 O 6 + SUGAR 6 O 2 OXYGEN

EQUATION FOR RESPIRATION C 6 H 12 O 6 + SUGAR 6 O 2 OXYGEN 6 CO 2 + 6 H 2 O + ENERGY CARBON DIOXIDE WATER ATP

Comparison of Photosynthesis and Cellular Respiration Photosynthesis Cellular Respiration

Fermentation • Does NOT use oxygen • This is how cells get energy when they cannot get the oxygen they need for cellular respiration • Ex: Burning feeling you get in leg muscles = lactic acid build up (made during fermentation)