Photosynthesisandrespiration 111109085811-phpapp01

Photosynthesisand

Respiration

How are they related?

PhotosynthesisThe process of photosynthesis is

a chemical reaction. It is the most important chemical

reaction on our planet.

What is the Process? The process of changing light energy (from the sun or

other light source) to chemical energy This energy is stored as sugar (a carbohydrate) Occurs in plants and some algae Plants need light energy, CO2, and H2O Photosynthesis takes place in the chloroplasts, using chlorophyll, the green pigment in plants

What Happens in this Chemical Reaction?

How Do Scientists Write this Chemical

Reaction?

What does this mean? Six molecules of carbon dioxide react with

six molecules of water to form 1 molecule of glucose and six molecules of oxygen.

HUH?

Plants capture light energy and use that energy to make sugar (which can be changed to starch, a carbohydrate, also)

Sunlight provides the energy needed by chlorophyll to change molecules of carbon dioxide and water into glucose

Oxygen is also released in this reaction

Why Is This So Important?

We cannot make our own food (glucose, energy), we must get our food from plants.

Plants are the first step in the food chain. The oxygen released during photosynthesis is

necessary for all living things.

Respiration

There are two types:

What is Cellular Respiration?

The process of cellular respiration is a chemical reaction.

It is the most important chemical reaction in our bodies

What is the Process? Cellular respiration is a

process, like photosynthesis.

Cellular respiration takes place in the mitochondria.

The mitochondria take in nutrients (glucose and oxygen), break them down, and create energy for the cell.

This process of creating cell energy is known as cellular respiration.

Takes place in all living things

(even plants!)

Let’s Write the Chemical Equation

Glucose + Oxygen ---- Carbon Dioxide + Water

Or another way of writing the equation is:

C6H12O6 + 6O2 ---- 6CO2 + 6H2O

Notice Any Similarities?

Notice any now?

Any Similarities with These?

Photosynthesis and Respiration are Related

It is the basic cycle on Earth.