Food for Plants

Cellular Energy (Photosynthesis & Cellular Respiration)

An Introduction

What is Photosynthesis?

The process of photosynthesis is a chemical reaction.

The process of converting light energy to make chemical energy (glucose)

It is the most important chemical reaction on our planet.

Prefix/Suffix: Photosynthesis

“Photo” means light

“synthesis” means to make

Who & where does it take place?

Most plants, most algae,

and cyanobacteria perform

photosynthesis; such organisms

are called photoautotrophs

Photosynthesis occurs in

chloroplasts of the plant cell in

the leaves of a plant.

-Inside the chloroplasts is a

green pigment called

chlorophyll that captures light.

CHOLORPLAST

Chemical reaction of photosynthesis?

CarbonDioxide

Water Glucose Oxygen

Light Energy

Reactant (NEED) Products (MAKE)

6CO2 6H2O C6H12O6 6O2

2. What Happens During Photosynthesis?

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

Carbon dioxide enters the leaf through holes called stomata

2. What Happens During Photosynthesis?

CO2 combines with the stored energy in the chloroplaststhrough 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 such cellulose

3.Why is This Important to Us?We cannot make our own energy

(glucose), we must get our energy from

plants. It is a carbohydrate used for

quick fuel.

Organisms, such as plants and animals,

take glucose and change it into ATP

energy during cellular respiration.

Plants are the first step in the food

chain.

The oxygen released during

photosynthesis is necessary for all

living things.

Cellular Respiration

1. 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 form that can be used by the organism.

This process is cellular respiration.

2. Who & where does it take place?

Takes place in ALL living things-

bacteria, plant, protists, fungi, AND

animal

Cell respiration occurs in “MIGHTY”

MITOCHONDRIA in eukaryotic cells.

3. Describe Cellular Respiration

•Definition: The process of breaking down glucosemolecules to release cellular ATP energy

• Respiration means “to breathe”

-AEROBIC respiration when oxygen is used

-ANAEROBIC respiration when NO oxygen is used (aka fermentation)

• Is a step by step process:A. GlycolysisB. Krebs Cycle/Citric Acid CycleC. Electron Transport Cycle

Light vs Dark

2 ATP 32-34 ATP2 ATP 2 ATP

Review Cellular Respiration

All living things need ENERGY

Energy in the form of…

Glucose = chemical energy

Cell energy=ATP

ADP – Low energy ATP – high energy

Energy

EnergyAdenosine diphosphate (ADP) + Phosphate Adenosine triphosphate (ATP)

Partiallychargedbattery

Fullychargedbattery

Section 8-1

Figure 8-3 Comparison of ADP and

ATP to a Battery

4. What is the Equation for Cellular

Respiration?

CarbonDioxide

WaterGlucose Oxygen

C6H12O6 6O2 6CO2 6H2O

Comparing Photosynthesis & Cellular Respiration

The product of one process is the reactant of the other! *flip flop

• Photosynthesis stores energy into glucose- Cell

Respiration releases energy from glucose

• Photosynthesis removes CO2 and respiration

returns it.

Carbon Cycle

Process of ATP to ADP

In class activity: All classes