Photosynthesis Photosynthesis

Photosynthesis Photosynthesis Photosynthesis Photosynthesis - Start

2018-11-08 7K 7 0 0

Photosynthesis Photosynthesis - Description

Photosynthesis. - a process used by plants and other autotrophs to convert the light energy captured from the sun into chemical energy that can be used to fuel the organism’s activities. . *It is the way plants make food! . ID: 723010 Download Presentation

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Photosynthesis Photosynthesis

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Presentations text content in Photosynthesis Photosynthesis






- a process used by plants and other autotrophs to convert the light energy captured from the sun into chemical energy that can be used to fuel the organism’s activities. *It is the way plants make food! *The most important chemical reaction on our planet!



Photosynthesis occurs in the

chloroplastThe chloroplast is filled with a light absorbing pigment called chlorophyll



Chloroplasts are found in high concentration in the leaves of plants

Green color due to the pigment chlorophyllTwo membranes cover the outsideThylakoid

are stacked inside and chlorophyll is embedded there

Thylakoids are surrounded by jelly-like substance call




The chlorophyll in the leaf absorbs the light emitted by the sun.

The most absorbed colors are red and blueThe most reflected color is greenThis is why when you look at a plant you see green


Leaf Structure

Many plant cells make up a single leaf from a plant

The top of the leaf is covered with a waxy cuticle (lipid) to prevent the loss of water


Leaf Structure

The bottom/underside of the leaves are porous and have openings called

stomata (controlled by guard cells) that allow for the gas exchange (CO2 in, O2 out)

Some cells are packed tightly, while some are “spongy” and allow air to get to all of the cells


Leaf Structure

Palisade layer

- most photosynthesis occurs here!Closely packed cells prevents wasted sunlightLocated at top of leaf where sun hits

Lots of chloroplasts

Large/long cells to increase surface area and light absorption


Leaf Structure

Vascular tissue -

Xylem and Phloem Xylem = carries water up the plant

Phloem = carries nutrients/food down plant


Draw and Label


Photosynthesis Reaction


Photosynthesis Reaction

Plant captures light energy and uses that energy to make glucose

Sunlight provides the energy needed to change molecules of carbon dioxide and water into glucose Oxygen is released in this reaction as waste product


Photosynthesis Reaction

(reactants) → (products)

Reactants = Water, carbon dioxide, sunlightProducts = Glucose, oxygen





Reactants and Products


2 - Enters through stomata from the air H2O - Xylem carries up from the soil Sunlight - Trapped by chlorophyll in chloroplasts

O2 - Exits through stomata



Draw a picture of a leaf

Label where reactants enter a plant Label where products exit a plant


Factors Affecting Photosynthesis

Light intensity and temperature

As light intensity increases, photosynthesis rate increasesAs temperature increases, photosynthesis rate increases

If temperature increases TOO much, the enzymes denature and photosynthesis rate decreases

Carbon dioxide level



levels increase, the rate of photosynthesis increases


As water levels decrease, the rate of photosynthesis decreases

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