Ch.8-3 Photosynthesis Cells.

Slides:



Advertisements
Similar presentations
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
Advertisements

KEY CONCEPT Photosynthesis requires a series of chemical reactions.
Photosynthesis. Chloroplast Structure Photosynthetic Reactions 1.Light dependent reactions 2.Light independent reactions (Calvin Cycle)
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
Photosynthesis. ATP Adenosine Triphosphate is the energy currency of the cell. It does not get destroyed (just like money), but cycles between 2 states.
Objective: To discuss light waves, how plants absorb light and describe how light dependent reactions occur. 8.2 notes.
Photosynthesis.
Catalyst  Could humans survive without plants? Why, if at all, are plants important?
4.3 Photosynthesis in Detail KEY CONCEPT Photosynthesis converts light energy is captured and used to build sugars that store chemical energy.
Photosynthesis Photosynthesis. I. How do living things get the energy they need to live? Photosynthesis: The process by which plants (autotrophs) and.
Essential Question: How do plants harness the suns energy?
Cell Energy Adapted from A. Anguiano & J. Zhen All organisms need energy to live.
Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Light Dependent Reactions Photosystem –clusters of hundreds of pigments.
4.3 Photosynthesis in Detail KEY CONCEPT Photosynthesis requires a series of chemical reactions.
Photosynthesis. Main Idea Light energy is trapped and converted into chemical energy during photosynthesis.
Cell Energy: Photosynthesis & Respiration
Energy in A Cell.
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
Overview of Photosynthesis
Photosynthesis.
Photosynthesis: Life from Light and Air
Photosynthesis: Life from Light and Air
Photosynthesis.
Photosynthesis Autotrophs- make their own energy
Figure 5.6 Chlorophyll H2C CH H3C CH2CH3 Chloroplast N N Mg Thylakoid
Process of Photosynthesis
Photosynthesis: Life from Light and Air
The Process of Photosynthesis
Photosynthesis.
Photosynthesis I pp
Photosynthesis.
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
The Great Circle of Life!
Photosynthesis.
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
Photosynthesis.
PHOTOSYNTHESIS.
KEY CONCEPT The overall process of photosynthesis produces sugars that store chemical energy. Photosynthesis requires a series of chemical reactions.
8-3 The Reactions of Photosynthesis
The Reactions of… Photosynthesis.
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
Ch 8 Photosynthesis 8.1 Energy and Life
Photosynthesis Stores Energy in Organic Compounds
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
Nature’s energy factory! Page 89 and 90
9.2 Section Objectives – page 225
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
Chapter 8 Photosynthesis.
Photosynthesis.
Light Dependent and Independent Reactions
The Process of Photosynthesis
Chloroplast An organelles that specializes in photosynthesis in plants and many protists. Plant chloroplast have two outer membranes , and are filled.
8-3 The Reactions of Photosynthesis
PHOTOSYNTHESIS: Converting solar energy into chemical energy (SUGARS).
Photosynthesis!!.
Chapter 8 Cellular Energy 8.1 How Organisms Obtain Energy Autotrophs Autotrophs are organisms that obtain energy by making their own food. (sugar-glucose)
Photosynthesis in detail
The student is expected to: 4B investigate and explain cellular processes, including homeostasis, energy conversions, transport of molecules, and synthesis.
C. Photosynthesis occurs in two main stages
Chapter 8 Cellular Energy 8.1 How Organisms Obtain Energy Autotrophs Autotrophs are organisms that obtain energy by making their own food. (sugar-glucose)
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
8.2 Photosynthesis: An Overview
Baltimore Polytechnic Institute Unit 4: Energy; Photosynthesis
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
Converting Light Energy into Chemical Energy
8.2 Photosynthesis Honors Assessment
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
Presentation transcript:

Ch.8-3 Photosynthesis Cells

POINT > Describe the light-dependent reactions of photosynthesis (light reactions) POINT > Describe the light-independent reactions of photosynthesis (Calvin cycle) POINT > Relate fall colors to plant pigments

POINT > Describe the light-dependent reactions of photosynthesis 6CO2 + 6H2O  C6H12O6 + 6O2

POINT > Describe the light-dependent reactions of photosynthesis Photosynthesis includes two sets of reactions: light-dependent reactions and light-independent reactions

POINT > Describe the light-dependent reactions of photosynthesis 1. Light-Dependent Reactions Requires direct involvement of light & chlorophyll Occurs in the thylakoids

POINT > Describe the light-dependent reactions of photosynthesis Light-Dependent Reactions produce: 1. ATP: cell’s energy molecule 2. NADPH: carries high energy electrons

POINT > Describe the light-dependent reactions of photosynthesis Requires water (for electrons) Produces oxygen (as a waste product)

WB CHECK: Where in the chloroplast do the light-dependent reactions occur? What is produced during the light-dependent reactions that is a waste product to the plant?

WB CHECK: What two things are produced during the light-dependent reactions that are important to the plant? What are two things required for the light-dependent reactions to happen?

POINT > Describe the light-dependent reactions

1. Light is absorbed by chlorophyll in Photosystem II

2. The absorbed energy creates high energy electrons and splits water molecules (O2 and H+ produced)

3. The high energy e- are passed through a series of carriers in the thylakoid membrane This is the Electron Transport Chain (ETC)

4. Energy released by the ETC is used to move more H+ into the thylakoid space

Place the following in order: WB CHECK: Place the following in order: ___ a water molecule is split ___ lots of H+ accumulate in the thylakoid space ___ light energy is absorbed by Photosystem II ___ high energy electrons move through the ETC

Place the following in order: WB CHECK: Place the following in order: _2__ a water molecule is split _4__ lots of H+ accumulate in the thylakoid space _1__ light energy is absorbed by Photosystem II _3__ high energy electrons move through the ETC

5. Light absorbed by chlorophyll in Photosystem I is used to further energize the e- in the ETC

A H+ gradient is now established across the thylakoid membrane A H+ gradient is now established across the thylakoid membrane. High H+ in thylakoid space, low H+ in stroma

6. The H+ gradient is used by ATP Synthase in the thylakoid membrane to make ATP from ADP

7. The high energy electrons are transferred to NADP+ to form NADPH

Place the following in order: WB CHECK: Place the following in order: ___ NADP+ accepts a high energy electron ___ light energy is absorbed by Photosystem I ___ ATP synthase uses H+ gradient to make ATP ___ light energy is absorbed by Photosystem II

Place the following in order: WB CHECK: Place the following in order: _4__ NADP+ accepts a high energy electron _2__ light energy is absorbed by Photosystem I _3__ ATP synthase uses H+ gradient to make ATP _1__ light energy is absorbed by Photosystem II

Recap: Light energy drives the ETC in the thylakoid membrane, producing ATP and NADPH ATP and NADPH will be used in the light-independent reactions to make sugars (in the stroma)

Recap: Light energy drives the ETC in the thylakoid membrane, producing ATP and NADPH Question: So, if the plant made lots of ATP in the light reactions, why make sugar? Answer: ATP and NADPH have lots of energy but are unstable (break down after a few minutes) The plant makes glucose (and other carbohydrates) because those are stable molecules for energy storage

POINT > Describe the light-independent reactions of photosynthesis (Calvin cycle) Light-Independent Reactions: No direct involvement from light Occurs in the chloroplast stroma Uses ATP & NADPH to produce sugars Requires carbon dioxide

POINT > Describe the light-independent reactions of photosynthesis (Calvin cycle)

WB CHECK: Where in the chloroplast does the Calvin cycle take place? What are two products of the light reactions that are used in the Calvin cycle? What else is required in the Calvin cycle?

In the Calvin cycle, CO2 is combined with a 5-carbon compound called ribulose bisphosphate

The enzyme that catalyzes the reaction of CO2 is called Rubisco (ribulose bisphosphate carboxylase)

There is more Rubisco on earth than any other protein

ATP and NADPH from the light reactions power all of the reactions in the Calvin cycle!

For every six CO2 that enter the Calvin cycle, two 3-carbon sugars are produced The 3-C sugars are then made into glucose, cellulose, starch, etc, depending on the needs of the plant

WB CHECK: What is produced in the Calvin cycle? What is the enzyme that combines CO2 with ribulose bisphosphate? What powers the Calvin cycle?

(Light-Independent Rxns) H2O O2 Light-Dependent Rxns ATP NADP+ NADPH ADP + Pi CO2 Calvin Cycle (Light-Independent Rxns) Sugar

Light Reactions of Photosynthesis sun sun e e H+ O to Calvin Cycle Two places where light comes in. Remember photosynthesis is endergonic -- the electron transport chain is driven by light energy. Need to look at that in more detail on next slide split H2O ATP

POINT > Relate fall colors to plant pigments Chlorophyll Breaks Down First Other pigments remain in leaves longer Temp, Light, Water Supply affect color

Homework: Read pages 230-241 (Figs. 8-10 and 8-11) Assess #1-3 page 241 Workbook pages 134-136