Photosynthesis Powerpoint Presentation

7/28/2019 Photosynthesis Powerpoint Presentation

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PHOTOSYNTHESIS

Autotrophic Process: Plants and plant-like organismsmake their energy (glucose) from sunlight.

Stored as carbohydrate in their bodies.

6CO2 + 6H2O + sunlight

C6H12O6 + 6O2


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Why is Photosynthesis important?

Makes organic molecules (glucose) out

of inorganic materials (carbon dioxide

and water).

It begins all food chains/webs. Thus

all life is supported by this process.It also makes oxygen gas!!


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Photosynthesis-starts to ecological food webs!


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Plants use sunlight to turn waterand carbon dioxide into glucose.

Glucose is a kind of sugar.

Plants use glucose as food for

energy and as a building blockfor

growing.

Autotrophs make glucose and

heterotrophs are consumers of it.

Photo-synthesismeans"putting together with light."
http://sps.k12.ar.us/massengale/pre_ap_lab_reports.htmhttp://sps.k12.ar.us/massengale/pre_ap_lab_reports.htmhttp://sps.k12.ar.us/massengale/pre_ap_lab_reports.htm


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How do we know that plants make

carbohydrates from just carbon dioxide

water and light energy?

For example:

Jan Baptisa van Helmont (1648)planted awillow branch weighing 5 pounds into 200

pounds of soil and then after 4 years the tree

weighed 169 lbs. and the soil was still

nearly 200 lbs.

Experiments!
http://fig.cox.miami.edu/~cmallery/150/phts/c1x2-phts-collage.jpg


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Photosynthesis

Carbon dioxide + water glucose + oxygen

sunlight

absorbed by chlorophyll

6CO2 + 6H2O + energy C6H12O6 + 6O2

As can be seen from the equation for photosynthesis, the

wood, bark, and root came from water and c arbon

dioxide.
http://fig.cox.miami.edu/~cmallery/150/phts/c1x2-phts-collage.jpg


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Check it!

Plants in Action

What is the

process

that uses

the suns

energy to

make

simplesugars?


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Plant leaves have many types of cells!


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Plant Cells


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The photograph below is an elodea leaf X 400.

Individual cells are clearly visible. The tiny

green structures within the cells arechloroplasts

this is where

photosynthesishappens.
http://faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20101/Bio%20101%20Lectures/photosynthesis/photos15.jpg


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Chloroplasts make the sugars!


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PlantsLeaves are green

because theycontain

the pigment:

chlorophyll

Leaves have a

large surface areato absorb as much

light as possible"Thanks for the Glucose!"
http://www.lewport.wnyric.org/jwanamaker/animations/Chrom&Elpho.htmlhttp://www.phschool.com/science/biology_place/biocoach/photosynth/action.htmlhttp://www.phschool.com/science/biology_place/biocoach/photosynth/action.htmlhttp://www.lewport.wnyric.org/jwanamaker/animations/Chrom&Elpho.html


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Chloroplasts

make theoxygen too!


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StomaThis opening how plants exchange gases!

Check it! Can you name the two importantgases that go in and out of the leaves?

Why are the

stomata

located on the

underside of

leaves?


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PHOTOSYNTHESIS

Absorbing Light Energy to make chemicalenergy: glucose!

Pigments: Absorb different colors of white light

(ROY G BIV) Main pigment: Chlorophyll a

Accessory pigments: Chlorophyll b and Carotenoids

These pigments absorb all wavelengths (light) BUT

green!


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PHOTOSYNTHESIS

Why do we see green? Green color from white light

reflected NOT absorbed

Chloroplast: organelleresponsible for photosynthesis

Chlorophyll: located within

Chloroplast

Green pigment


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Visible light is only

a small part of the

electromagnetic

spectrum (all forms

of light).


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http://www.phschool.com/science/biology_place/biocoach/photosynth/action.html


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http://www.phschool.com/science/biology_place/biocoach/photosynth/action.htmlhttp://www.phschool.com/science/biology_place/labbench/lab4/pigsep.html


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Chlorophyll: A Light Absorbing Pigment

The Solar Panel Chemical!
http://www.phschool.com/science/biology_place/labbench/lab4/pigsep.htmlhttp://www.phschool.com/science/biology_place/labbench/lab4/pigsep.html


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Photosynthesis

Glucose provides the energy and

carbon needed to make other

plant materials like wax and

proteins.


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Oxygen and Sugar!

I l t d i l i l t d t d


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In plants and simple animals, waste products are removed

by diffusion. Plants, for example, excrete O2, a product of

photosynthesis.


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EQUATION FOR

PHOTOSYNTHESIS

6CO2 + 6H2O + ENERGY C6H12O6 + 6O2

CARBON

DIOXIDE

WATER

GLUCOSE

OXYGEN


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The end!


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PHOTOSYNTHESIS

2 Phases Light-dependent reaction

Light-independent reaction

Light-dependent: converts light energy intochemical energy; produces ATP molecules tobe used to fuel light-independent reaction

Light-independent: uses ATP produced tomake simple sugars.


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PHOTOSYNTHESIS

Light-dependent reaction (LIGHT Reaction) Requires light

Occurs in chloroplast (in thylakoids)

Chlorophyll (thylakoid) traps energy from light Light excites electron (e-)

Kicks e- out of chlorophyll to an electron transport chain

Electron transport chain: series of proteins in thylakoid

membrane

Bucket brigade


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PHOTOSYNTHESIS

Light-dependent reaction (LIGHT Reaction) Energy lost along electron transport chain

Lost energy used to recharge ATP from ADP

NADPH produced from e- transport chain

Stores energy until transfer to stroma

Plays important role in light-independent reaction

Total byproducts: ATP, NADP, O2


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PHOTOSYNTHESIS

How did we get O2 as a byproduct?! Photolysis: replaces lost electrons by splitting

water


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Sun

Chlorophyll passes energy down through theelectron transport chain.

for the use in

light-independent reactions

bonds P

to ADP

formingATP

oxygen

released

splits

H2O

H+NADP+

NADPH

Light energy transfers to chlorophyll.

Energized electrons provide energy that

At each stepalong thetransport chain,

the electronslose energy.


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PHOTOSYNTHESIS

Light-independent reaction (Dark Reaction) Does not require light

Calvin Cycle

Occurs in stroma of chloroplast Requires CO2

Uses ATP and NADPH as fuel to run

Makes glucose sugar from CO2 and Hydrogen


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PHOTOSYNTHESIS

What affects photosynthesis? Light intensity: as light increases, rate of

photosynthesis increases


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PHOTOSYNTHESIS

What affects photosynthesis? Temperature:

Temperature Low = Rate of photosynthesis low

Temperature Increases = Rate of photosynthesis increases

If temperature too hot, rate drops


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Check it!

1. The process that uses the suns energy tomake simple sugars is _____________.

A. Cellular respirationB. Glycolysis

C. Photosynthesis

D. Photolysis


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Check it!

2. The function accomplished by the light-dependent reactions is ______________.

A. Energy storageB. Sugar production

C. Carbon fixation

D. Conversion of sugar


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Photosynthesis Powerpoint Presentation