end show slide 1 of 51 copyright pearson prentice hall 8-3 the reactions of photosynthesis
Post on 28-Dec-2015
214 Views
Preview:
TRANSCRIPT
Copyright Pearson Prentice Hall
End Show
Slide 1 of 51
8-3 The Reactions of Photosynthesis
Copyright Pearson Prentice Hall
End Show
Slide 2 of 51
8-3 The Reactions of Photosynthesis Inside a Chloroplast
Inside a Chloroplast
Photosynthesis takes place inside chloroplasts.
Plant
Plant cells
Chloroplast
Copyright Pearson Prentice Hall
End Show
Slide 3 of 51
8-3 The Reactions of Photosynthesis Inside a Chloroplast
Chloroplasts contain thylakoid membranes.
Chloroplast
Singlethylakoid
Copyright Pearson Prentice Hall
End Show
Slide 4 of 51
8-3 The Reactions of Photosynthesis Inside a Chloroplast
Grana are stacks of thylakoids.
Granum
Chloroplast
Copyright Pearson Prentice Hall
End Show
Slide 5 of 51
8-3 The Reactions of Photosynthesis Inside a Chloroplast
Photosystems are the light-collecting units of the chloroplast.
Contain chlorophyll.
Chloroplast
Photosystems
Copyright Pearson Prentice Hall
End Show
Slide 6 of 51
8-3 The Reactions of Photosynthesis Inside a Chloroplast
Phases of Photosynthesis:
●Light reaction
●Dark reaction (Calvin cycle)
Copyright Pearson Prentice Hall
End Show
Slide 7 of 51
8-3 The Reactions of Photosynthesis Inside a Chloroplast
Chloroplast
Light
H2O
O2
CO2
Sugars
NADP+
ADP + P
Calvin Cycle
Light- dependent reactions
Calvin cycle
Copyright Pearson Prentice Hall
End Show
Slide 8 of 51
8-3 The Reactions of Photosynthesis Light Reaction
Light Reactions:
Chlorophyll absorbs light (energized)
ATP is produced
Water is split into Hydrogen & Oxygen
Oxygen is released into the atmosphere
NADPH transports Hydrogen atoms
Copyright Pearson Prentice Hall
End Show
Slide 9 of 51
8-3 The Reactions of Photosynthesis The Calvin Cycle
Calvin Cycle:
NADPH + ATP + CO2 produce 2 molecules of PGAL
2 PGAL’s form one glucose molecule
Copyright Pearson Prentice Hall
End Show
Slide 10 of 51
8-3 The Reactions of Photosynthesis The Calvin Cycle
Six carbon dioxide molecules enter the cycle from the atmosphere and combine with six 5-carbon molecules.
CO2 Enters the Cycle
Copyright Pearson Prentice Hall
End Show
Slide 11 of 51
8-3 The Reactions of Photosynthesis The Calvin Cycle
The result is twelve 3-carbon molecules, which are then converted into higher-energy forms.
Copyright Pearson Prentice Hall
End Show
Slide 12 of 51
8-3 The Reactions of Photosynthesis The Calvin Cycle
The energy for this conversion comes from ATP and high-energy electrons from NADPH.
12 NADPH
12
12 ADP
12 NADP+
Energy Input
Copyright Pearson Prentice Hall
End Show
Slide 13 of 51
8-3 The Reactions of Photosynthesis The Calvin Cycle
Two of twelve 3-carbon molecules are removed from the cycle.
Energy Input
12 NADPH
12
12 ADP
12 NADP+
Copyright Pearson Prentice Hall
End Show
Slide 14 of 51
8-3 The Reactions of Photosynthesis The Calvin Cycle
The molecules are used to produce sugars, lipids, amino acids and other compounds.
12 NADPH
12
12 ADP
12 NADP+
6-Carbon sugar produced
Sugars and other compounds
Copyright Pearson Prentice Hall
End Show
Slide 15 of 51
8-3 The Reactions of Photosynthesis The Calvin Cycle
The 10 remaining 3-carbon molecules are converted back into six 5-carbon molecules, which are used to begin the next cycle.
12 NADPH
12
12 ADP
12 NADP+
5-Carbon MoleculesRegenerated
Sugars and other compounds
6
6 ADP
Copyright Pearson Prentice Hall
End Show
Slide 16 of 51
8-3 The Reactions of Photosynthesis The Calvin Cycle
Factors Affecting Photosynthesis
Many factors affect the rate of photosynthesis, including:
•Water & Carbon Dioxide
•Temperature & pH
•Intensity of light
Copyright Pearson Prentice Hall
End Show
Slide 17 of 51
8-3
In plants, photosynthesis takes place inside the
a. thylakoids.
b. chloroplasts.
c. photosystems.
d. chlorophyll.
Copyright Pearson Prentice Hall
End Show
Slide 18 of 51
8-3
Energy to make ATP in the chloroplast comes most directly from
a. hydrogen ions flowing through an enzyme in the thylakoid membrane.
b. transfer of a phosphate from ADP.
c. electrons moving through the electron transport chain.
d. electrons transferred directly from NADPH.
Copyright Pearson Prentice Hall
End Show
Slide 19 of 51
8-3
NADPH is produced in light-dependent reactions and carries energy in the form of
a. ATP.
b. high-energy electrons.
c. low-energy electrons.
d. ADP.
Copyright Pearson Prentice Hall
End Show
Slide 20 of 51
8-3
What is another name for the Calvin cycle?
a. light-dependent reactions
b. light-independent reactions
c. electron transport chain
d. photosynthesis
Copyright Pearson Prentice Hall
End Show
Slide 21 of 51
8-3
Which of the following factors does NOT directly affect photosynthesis?
a. wind
b. water supply
c. temperature
d. light intensity
top related