Presented by Gopal Veeranala S.A(Bio-Sci),Z.P.H.S., Uddemarry,Shameerpet M.P,Ranga Reddy Dist.Andhra Pradeshemail :

gopalveeranala@yahoo.com

Subject : BiologyClass : X

Is to make students understand the Photosynthesis and Reaction Mechanism of Photosynthesis.

OBJECTIVE

INDEX

What is a PhotosynthesisAnimation of PhotosynthesisInto the LeafSteps in Photosynthesis MechanismLight ReactionsDark ReactionsSelf Assessment

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PhotosynthesisIs a photo-chemical reaction during which Carbohydrates are formed from Water(H2O) and Corban-di-oxide(CO2)in Chloroplast of Green plants in presence of Sun Light

6CO2 + 12H2O C6H12O6 + 6H2O + 6O2

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any slide

CO2

CO2

ChlorophyllO2

O2O2

O2

H2OH2O

6CO2 + 12H2O C6H12O6 + 6H2O + 6O26CO2 + 12H2O C6H12O6 + 6H2O + 6O2

Factors of Photosynthesis

•Light

•Carbon-di-Oxide (CO2)

•Chlorophyll and

•Water(H2O)

(Animation)

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Come with me into the leaf

Cuticle

Upper EpidermisChloroplast

Vascular Bundle

Xylem

PhloemLowerEpidermis

Spongy Parenchyma

Palisade Parenchyma

Chloroplasts (containing chlorophyll)

Stoma

Click on this Chloroplast to

view the picture of Chloroplast

Molecular model of chlorophyll

eg. C55H7205N4Mg

Photosynthesis Occurs in 2 steps

1. Light Reactions• The Reactions of Photosynthesis that

occur only in the presence of light energy.

2. Dark Reactions – Calvin Cycle• The Reactions of Photosynthesis which

don’t require light energy.

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When the Light falls on the Leaf

Chloroplast

e- e-H H

O

H2O(Water Molecule)

e-e-H+ H+

O-O

2-

+H2O 2H+e-

O2-

Chl Chl+lighte-

+

Light ReactionsLight Reactions

Normal ChloroplastOxidised Chloroplast

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H+ H+

O2-

O2-Oe-e-

O2- 2e-+O

e-e-

ATP

NADPNADPH

Chl+ e-+ Chl

O + O O2

REMEMBER Oxygen(O2)is released in the

Photosynthesis Before taking CO2

O2 is from H2O not from CO2

Normal ChloroplastOxidised Chloroplast

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RuBP5C

ATP

ADP

NADPH2

NADPCALVIN CYCLE – The three carbon pathway

6CO2 +6RuBP6Unstable Intermediate

CO21C

PGAPGA6C

6Unstable Intermediate12PGA12 PGA C6H12O6 + 6RuBP

ATP

NADPH2

Products of Light Reactions

PGA

3C

PGA

3C

C6H1206

(Glucose)

Using NADPH & ATP produced in Light ReactionsPGA is converted to Glyceraldehyde-3-Phosphate

RuBP5C

Click slowly

RuBP5C

ATP

ADPNADPH2

NADPCALVIN CYCLE(The three carbon pathway)

6CO2 +6RuBP6Unstable Intermediate

CO21C

6C

6Unstable Intermediate12PGA12 PGA C6H12O6 + 6RuBP

ATP

NADPH2

PGA

3C

PGA

3C

C6H1206

(Glucose)

Click slowly

MELVIN CALVINDark Reactions in Plants was identified by Melvin Calvin

1. Which of the following is released during photosynthesis?

2. Photosynthesis occurs in which place of the plant cell?

Carbon dioxideOxygenNitrogenHydrogen

CytoplasmMitochondriaChloroplastNucleus

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3. What are the main Factors of Photosynthesis?

H20,CO2,ChloroplastH20,CO2,N2

H20,CO2,N2

CO2,N2,H24. How many steps are there in the Mechanism

of Photosynthesis?

3 1 4 2

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5. What is the Chemical Equation of the Photosynthesis ?

6. What are the end products of Light Reactions?

O2,CO2,ATPATP,NADPH,O2

C6H12O6,NADPH20,CO2,ATP

CC66HH121206+6O06+6O22+6H+6H22O O 6CO 6CO22+12H+12H22OO

6CO6CO22+6H+6H22O O CC66HH121206+6CO06+6CO22+6H+6H22OO

6CO6CO22+12H+12H22OOCC66HH121206+6O06+6O22+6H+6H22OO

12CO12CO22+6H+6H22O O CC66HH121206+6CO06+6CO22+6H+6H22OO

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7. In plant exchange of gases takes place through?

8. Which of the following is the most important life process ?

TransportExcretionPhotosynthesisNutrition

StomataPalisade TissueSpongy TissueMidrib

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9. What are the end products of Dark Reactions?

10. Dark Reaction is also know as?

NitrationPhosphorylationRespirationCalvin Cycle

C6H12O6,H20ATP,NADPH,O2

C6H12O6,NADPCO2,NADP

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What a Plant thinks about Photosynthesis

BibliographyImages from www.google.com- image search

Biology Text Book of X Class (A.P State Syllabus )

For More InformationVisit These Websites

What is a Photosynthesis?

Complete Biology Topics

Light Reactions

Dark Reactions

Biology on Web

THANK YOUTHANK YOU

Presented by,

Gopal Veeranala

WitthSpecial Thanks To

Microsoft IT Academy,HYDERABAD

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