8 3 the reactions of photosynthesis
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8-3 The Reactions of Photosynthesis. Objectives:. Describe the structure and function of a chloroplast . Describe what happens in the light-dependent reactions . Explain what the Calvin Cycle is . Identify factors that affect the rate at which photosynthesis occurs. Inside a Chloroplast.

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8-3 The Reactions of Photosynthesis

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8 3 the reactions of photosynthesis

8-3 TheReactions of Photosynthesis


Objectives

Objectives:

  • Describe the structure and function of a chloroplast.

  • Describe what happens in the light-dependent reactions.

  • Explain what the Calvin Cycle is.

  • Identify factors that affect the rate at which photosynthesis occurs.


Inside a chloroplast

Inside a Chloroplast

  • Inside a Chloroplast

    • In plants, photosynthesis takes place inside chloroplasts.

Plant

Chloroplast

Plant cells


Inside a chloroplast1

Inside a Chloroplast

  • Chloroplasts contain thylakoids—saclike photosynthetic membranes.

Single

thylakoid

Chloroplast


Inside a chloroplast2

Inside a Chloroplast

  • The reactions of photosynthesis include: the light-dependent reactions and the light-independent reactions, or Calvin cycle.

  • The light-dependent reactions take place within the thylakoid membranes.

  • The Calvin cycle takes place in the stroma, which is the region outside the thylakoid membranes.


Inside a chloroplast3

Inside a Chloroplast

CO2

H2O

Light

NADP+

ADP + P

Light- dependent reactions

Calvin cycle

Calvin Cycle

Chloroplast

Sugars

O2


Electron carriers

Electron Carriers

  • Electron Carriers

    • When electrons in chlorophyll absorb sunlight, the electrons gain a great deal of energy.

    • Cells use electron carriers to transport these high-energy electrons from chlorophyll to other molecules.

    • These high-energy electrons are used to help build a variety of molecules the cell needs, including carbohydrates like glucose.


Electron carriers1

Electron Carriers

  • One of these carrier molecules is a compound known as NADP+ (nicotinamide adenine dinucleotide phosphate).

  • NADP+ accepts and holds 2 high-energy electrons along with a hydrogen ion (H+).

  • This converts NADP + into NADPH.

  • NADPH can then carry high-energy electrons produced by light absorption in chlorophyll to chemical reactions elsewhere in the cell.


Light dependent reactions

Light-Dependent Reactions

The light-dependent reactions produce oxygen gas and convert ADP and NADP+ into the energy carriers ATP and NADPH.


The calvin cycle

The Calvin Cycle

The Calvin Cycle uses ATP and NADPH from the light-dependent reactions to produce high-energy sugars.


Factors affecting photosynthesis

Factors Affecting Photosynthesis

  • Many factors affect the rate of photosynthesis, including:

    • Water

    • Temperature

    • Intensity of light


8 3 section assessment

8-3 Section Assessment

  • Summarize the light-dependent reactions.

  • What reactions make up the Calvin Cycle?

  • What is the function of NADPH?

  • What factors affect photosynthesis?


8 3 section assessment answers

8-3 Section AssessmentAnswers

  • The light-dependent reactions produce oxygen gas and convert ADP and NADP+ into the energy carriers ATP and NADPH.

  • The Calvin Cycle uses ATP and NADPH from the light-dependent reactions to produce high-energy sugars.

  • The main function of MADPH is to carry high-energy electrons produced by light absorption in chlorophyll to chemical reactions elsewhere in the cell.

  • Factors that affect photosynthesis are water, temperature, and intensity of light.


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