Photosynthesis & Respiration

What is Photosynthesis The process by which a cell captures energy in sunlight and uses it to make food is called photosynthesis. During photosynthesis, plants and some other organisms absorb energy from the sun and use the energy to convert carbon dioxide and water into sugars and oxygen. It takes place in two stages: Plants capture the suns energy Plants produce sugars

What is Photosynthesis? The process of photosynthesis is a chemical reaction. Which are the reactants and which are the products? It is the most important chemical reaction on our planet. Almost all oxygen in Earths atmosphere is produced by living things through photosynthesis.

What is the Equation for the Chemical Reaction of Photosynthesis?

What is the equation for the chemical reaction of photosynthesis?

What is the equation for the chemical reaction of photosynthesis? Six molecules of carbon dioxide react with six molecules of water to form 1 molecule of glucose and six molecules of oxygen.

The 6 carbon dioxide and 6 water molecules on the left are raw materials. On the right you have one molecule of glucose and six of oxygen which are the products An arrow means yields. It points from the raw material to the products Sugars are used for food and energy. Can also make other compounds such as cellulose for cell walls. When you eat potatoes or carrots you are eating the plants stored energy.

Describe Photosynthesis

Describe Photosynthesis The process of changing light energy to chemical energy Energy stored as sugar Occurs in plants and some algae Plants need light energy, CO2, and H2O Takes place in the chloroplasts, using chlorophyll, the green pigment in plants

What happens during photosynthesis?

What happens during photosynthesis? Stage1: Capturing the Suns energy Plants capture light energy and use that energy to make glucose Sunlight provides the energy needed by chlorophyll to change molecules of carbon dioxide and water into glucose Oxygen is also released in this reaction

What happens during photosynthesis? Stage 2: Using energy to make food Carbon dioxide enters the leaf through holes called stomata CO2 combines with the stored energy in the chloroplasts through a chemical reaction to make glucose The sugar is moved through tubes in the leaf to the roots, stems and fruits of the plants Some of the sugar is used right away by the plant for energy; some is stored as starch; and some is built into plant tissue

Why is this important to us?

Why is this important to us? We cannot make our own food (glucose, energy), we must get our food from plants. Plants are the first step in the food chain. Producers and consumers Producer or Autotroph: organism that makes it own food. Consumer or Heterotroph: organisms that can’t make there own food. A type of heterotroph that obtains its energy from dead or decaying organisms is called a decomposer.

Why is this important to us? The oxygen released during photosynthesis is necessary for all living things.

Learn more about photosynthesis at: http://www.ftexploring.com/me/photosyn1.html

Review and Reinforce Photosynthesis Review and Enrichment Edusmart Brainpop

What is Cellular Respiration?

What is Cellular Respiration? The release of chemical energy for use by cells.

What is Cellular Respiration? Once the energy that was in sunlight is changed into chemical energy by photosynthesis, an organism has to transform the chemical energy into a a form that can be used by the organism. This process is cellular respiration.

Describe Cellular Respiration

Describe Cellular Respiration The breakdown of glucose molecules to release energy Takes place in all living things Is a step by step process

What is the chemical equation for cellular respiration?

What is the chemical equation for cellular respiration?

Read how photosynthesis & respiration are related: http://www.usoe.k12.ut.us/curr/science/sciber00/8th/energy/sciber/photosyn.htm