happy thursday! please take out a pencil and place all of your belongings on the end counter except...
TRANSCRIPT
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Happy Thursday!
• Please take out a pencil and place all of your belongings on the end counter except for your book.
• Please don’t mess with any of the lab supplies yet
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Photosynthesis
Chapter 8
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Announcements
• Exams– Review tomorrow
• Collect Extra Credit• Say Hi to Mr. Jahn
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Agenda
• Mini-Lecture/ Discussion• Leaf Activity• Class Discussion – Debrief Activity
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Standards & Objective
• CSBS – 1F• Students know usable energy is captured from sunlight by
chloroplasts and is stored through the synthesis of sugar from carbon dioxide.
• Today’s Goal• Recognize differences in leaf structures and interpret how
these differences allow plants to diversify and perform photosynthesis at the optimum level in many different ecosystems.
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The Leaf - Pg. 208 in your Text
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Where does Photosynthesis take place?
• Where does photosynthesis take place?– In the Chloroplasts (in plant cells)
• Where are the Chloroplasts located?– In the green part (Leaves) of the plant
• Are all leaves exactly the same on different plants?
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Leaf MorphologyLeaf Morphology
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Where does Photosynthesis take place?
• Where does photosynthesis take place?– In the Chloroplasts
• Where are the Chloroplasts located?– In the green part (Leaves) of the plant
• Are all leaves exactly the same on different plants?• NO!
• But, Why?
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Leaf Lab/Activity• Answer the pre-activity questions• Look at 4 types of leaves.
– Answer all the questions about the leaves– Hypothesis where leaf might be native, how does the
structure assist in the function?– Draw the Leaf so the whole specimen fits in the box– Using the DISSECTING MICROSCOPE, look at the leaf.
• Include magnification• Switch Stations every 7 minutes• Stop after 2 stations for discussion
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Where does Photosynthesis take place?
• Where does photosynthesis take place?– In the Chloroplasts
• Where are the Chloroplasts located?– In the green part (Leaves) of the plant
• Are all leaves exactly the same on different plants?• NO!
• But, Why?
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Activity Conclusion• What did you notice about leaf texture?• What did you notice about lead thickness?• How did the direction of veins differ?• Did any of these leaves seem like they were not
from the same ecosystem as the others?• How does the structure of the leaf affect water flow
around the plant?• How do all of these components combine to allow
plants to perform photosynthesis at an optimal level?
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Homework
• Finish lab– All questions are answered– All pictures are drawn and detailed– Make sure everything is quality
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IQ # 1 – 8.2• Yes, its 8.2, we’re going out of order 1. Write a one sentence summary for each of the following
scientists experiments: (p. 204-206)– Van Helmont– Preistly– Ingenhousz
2. Write out the photosynthesis reaction. Count and list the total number of carbon, hydrogen, and oxygen molecules on both sides of the reaction. Do they equal? (p. 206)
3. What four items does photosynthesis require? Define pigment and chlorophyll. Why are plants green?
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Welcome Back!
• Today – – Grades will be updated at the end of the period
• Wednesday – – Extra Credit – 8.1-8.2 (or 8.3)
• Friday – – Quiz!
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California State Standards
• Cell Biology1f: usable energy is captured from sunlight by chloroplasts and is stored through the synthesis of sugar from carbon dioxide
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Today
• 8.2– IQ # 1– Lecture and Discussion– Tomorrow - Lab
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A. Investigating Photosynthesis Investigations into photosynthesis began with the following question:
“When a tiny seedling grows into a tall tree with a mass of several tons, where does the tree’s increase in mass come from?”
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1. ______________ Experiment (1643)
Put soil in pot and took mass
Took a seedling and took mass
Put seed in soil...watered...waited five years... the seedling became a tree.
He concluded that He determined the
Van Helmont’s
the mass came from water
the “hydrate” in the carbohydrate portion of photosynthesis
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2. ___________ Experiment (1771)
Put a lit candle in a bell jar- Placed a mint plant in the jar with the candle-
Concluded
He determined
Priestly’s
The flame died out.
Flame lasted longer
plants release a substance neededfor candle burning.
plants release oxygen
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3. ________________Experiment (1779)
Put aquatic plants in light...
Put aquatic plants in dark... He determined:
4. _______________ (1948)
He determines
Known as the
Jan Ingenhousz
produced oxygen
No oxygen
Light is needed to produce oxygen
Melvin Calvin
carbon’s path to make glucose
Calvin’s cycle
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8-2 Photosynthesis: An Overview
Photosynthesis=
Plants convert ______________ → ______________ through a series of oxidation/reduction reactions.
Process where plants use energy of sunlight to convert water and carbon dioxide into high-energy Carbohydrate (glucose)and oxygen, a waste product.
Sunlight energy Chemical energy
6 CO2 + 6H2O + SUNLIGHT → C6H12O6 (SUGAR) + 6O2
Reduction = Gain Electrons
Oxidation= Lose Electrons OIL RIG
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6 CO2 + 6H2O + SUNLIGHT → C6H12O6 (SUGAR) + 6O2
sunlight
O2
CO2
H2O
C6H12O6
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Light Energy
Chloroplast
CO2 + H2O Sugars + O2
Photosynthesis: Reactants and Products
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B. Light and Pigments Photosynthesis requires ______ (soil), ____________ (air), and ____ (sun), and ___________ (a molecule in chloroplasts).
Energy from the sun is in the form of _____.
Sunlight= perceived as white light=
The wavelengths you can see are part of the _______________.
Plants capture light with light absorbing molecules called ________.
The main pigment is chlorophyll (2 kinds)1. 2.
water Carbon dioxidelight chlorophyll
light
A mixture of different wavelengths
Visible Spectrum
pigments
Chlorophyll aChlorophyll b
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Absorption of Light byChlorophyll a and Chlorophyll b
V B G Y O R
Chlorophyll b
Chlorophyll a
Figure 8-5 Chlorophyll Light Absorption
Chlorophyll absorbs light in the __________ and ___ wavelengths
Gammarays
X-rays UV Infrared Micro-waves
Radiowaves
Visible light
Wavelength (nm)
Blue-violetred
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Chlorophyll reflects ______ wavelengths (that’s why plants appear green)
The energy absorbed by chlorophyll is transferred to _________ (in chloroplasts) which makes photosynthesis work.
green
electrons
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IQ # 1 – 8.2• Yes, its 8.2, we’re going out of order 1. Write a one sentence summary for each of the following
scientists experiments: (p. 204-206)– Van Helmont– Preistly– Ingenhousz
2. Write out the photosynthesis reaction. Count and list the total number of carbon, hydrogen, and oxygen molecules on both sides of the reaction. Do they equal? (p. 206)
3. What four items does photosynthesis require? Define pigment and chlorophyll. Why are plants green?
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Chromatography Lab• Cut Chromatography paper strip in half (longways)• Black Ink Marker
– Draw line with marker ½ inch from bottom– Allow marker to dry. Put in Water/Solvent A.
• Make sure not to allow marker line to touch water directly
– Fold over top so the chromatography paper doesn’t fall into flask.
• Leaf Pigment– Using the spinach extract and the capillary tube, draw a line of
spinach ½ inch from the bottom– Repeat 20 times, allowing the extract to dry between each
application. – Place in acetone, fold over top, replace cap
• Make sure not to allow spinach line to touch acetone directly
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Homework
• Finish Lab Questions• 8.1 and 8.2 Vocabulary Flashcards
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IQ # 2 (8.1)1. How does the impala get its energy, how does the leopard
get its energy? How do they differ? What it the ultimate source of energy? (Fig. 8.1)
2. What is ATP? How is ATP released from ATP? What does it stand for? What is its function? How do ATP and ADP differ? Which is the storage form? (p. 202)
3. What is a common use for ATP? Which direction are each of the ions being pumped?
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Wednesday Announcements
• TODAY IS A MAKE-UP DAY!!• Wednesday Afternoon
– Tutoring (pass back forms)– 8.1 & 8.2 (8.3)
• Thursday– Observation
• Friday– Lunch – Make-Up Lab– QUIZ (8.1 and 8.2)
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Agenda
• IQ # 2• Review Lab• Lecture/ Discussion
– Section 8.1 – Energy and Life
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8-1 Energy of Life
Energy=
Living organisms depend on energy.
Living things get energy from _______.
The ultimate source of energy is the _____.
The ability to do work
food
sun
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A. Autotrophs and Heterotrophs
Autotrophs=
o Example: plants use sunlight to make food
Heterotrophs=
o Example: ___________- eat plants ___________- eat animals that have stored energy from plants they eat
___________- eat decomposing organisms
Organisms that make their own food
Organisms that need to consume food for energy
herbivores
carnivores
detritovores
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Adenine Ribose 3 Phosphate groups
B. Chemical Energy and ATP•Forms of energy: light, heat, electricity, and
•_____ (Adenosine Triphosphate)=
Chemical energy (stored in bonds)
ATP
The basic energy source (chemical energy) of all cells
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1. Storing Energy• ADP (Adenosine Diphospate) contains ____ phosphates
instead of 3.
• If a cell has extra energy,
2. Releasing Energy
• To release energy stored in ATP,
2
Small amounts can be stored by adding a phosphate group to ADP molecules to produce ATP.
The cell can break the high energy bond betweenthe 2nd and 3rd phosphate group
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ADP ATP
Energy
EnergyAdenosine diphosphate (ADP) + Phosphate Adenosine triphosphate (ATP)
Partiallychargedbattery
Fullychargedbattery
Section 8-1
Figure 8-3 Comparison of ADP and ATP to a Battery
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C. Using Biochemical Energy
How ATP is used in the cell- - aids in - -
Cells contain a small amount of ATP. Only enough to provide a few seconds of activity.
ATP is great at ________________ but not good at
C. Glucose stores ___ times more energy than ATP.
The energy stored in Glucose can be used to
Carry out active transportmoving organelles throughout the cell
Protein synthesisProducing light (ex. fireflys)
transferring energy Storing large amounts of energy
90
regenerate ATP when the cell needs it.
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Homework
• Study for 10 minutes using flashcards• Bring Coloring Items
– Colored Pencils– Markers– Crayons
• Section Assessment 8.1 – Pg. 203 #1-5
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Light
Chloroplast
Reflectedlight
Absorbedlight
Transmittedlight
8-3 The Reactions of Photosynthesis A. Inside a Chloroplast
•Site of Photosynthesis=
The chloroplasts
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B. Electron Carriers Sunlight energy is transferred to
The electrons
High energy electrons require ANALOGY: If you wanted to transfer hot coals from one campfire to another, it requires a special carrier like a pan or bucket.
Electron carriers pass electrons from carrier to carrier to carrier;
A Key electron carrier in photosynthesis is NADP+. NADP+ + + →→ (electron carrier) (high energy electrons) (hydrogen ions) (energy storing compound)
When energy is needed to do cellular work, the
electrons in chlorophyll.
gain a lot of energy.
a special carrier (molecule/compound).
Forming an electron transport chain.
2e- H+ NADPH
Covalent bonds of NADPH are broken to releasethe high energy electrons.
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Photosynthesis is a two part process:1.
-aka: 2.
-aka: -aka: -aka:
Light
O2Sugars
CO2
Light-Dependent Reactions
CalvinCycle
NADPHATP
ADP + PNADP+Chloroplast
Section 8-3Figure 8-7 Photosynthesis: An Overview
Light-dependent reactions (located in thylakoid membranes)Light Reaction
Light-independent reactions (located in stroma)Dark reactionCalvin CycleCarbon fixation
H20
Chloroplast
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• An overview of photosynthesis
Figure 7.5
Light
Chloroplast
LIGHTREACTIONS(in grana)
CALVINCYCLE
(in stroma)
Electrons
H2O
O2
CO2
NADP+
ADP+ P
Sugar
ATP
NADPH
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C. Light-Dependent Reactions (Requires Light)· Located in the ___________________________
· In the light reaction, ___________ is used to produce
_____ and _______
thylakoid membrane
light energyATP NADPH
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KEY PLAYERS IN LIGHT REACTION:
Photosystem I and II:
Electron carriers:
Water:
• ATP Synthase:
Clusters of chlorophyll pigment
ADP and NADP+
Donates electrons
Enzyme (protein) that makes ATP
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Primaryelectron acceptor
Primaryelectron acceptor
Electron transport chain
Electron transport
Photons
PHOTOSYSTEM I
PHOTOSYSTEM II
Energy forsynthesis of
by chemiosmosis
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• The production of ATP by chemiosmosis in photosynthesis
Figure 7.9
Thylakoidcompartment(high H+)
Thylakoidmembrane
Stroma(low H+)
Light
Antennamolecules
Light
ELECTRON TRANSPORT CHAIN
PHOTOSYSTEM II PHOTOSYSTEM I ATP SYNTHASE
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A. Photosystem II (PSII) * Absorbs light to
2H2O
o e- =
o O2 =
o H+=
B. Electron Transport Chain * The light energy
* The electrons get passed
split (break up) water molecules
→ 4H+ + 4e- + O2
Donated to chlorophyll
Released into air providing oxygen for us
Released inside the thylakoid membrane
excites electrons increasing their energy level.
down an electron transport chain tophotosystem I (PSI)
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C. Photosystem I· Light energy energizes electrons.· NADP+ accepts the electrons and an H+ and are
used to make _________. D. Hydrogen Ion Movement
· When water splits,
· The difference in charges
E. ATP Formation
· _____ do not cross the membrane directly. It needs the help of a membrane protein.
· H+ ions pass through the protein:
NADPH
H+ ions fill up the inner thylakoid membrane (making it positively charged). As a result, the stroma is negatively charged.
Provides the energy to make ATP.
Ions
ATP synthase is an enzyme that converts ADP to ATP
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PRODUCTS OF THE LIGHT REACTION:
· ____ : Released in the air
· ______________: These contain abundant chemical energy but they are unstable. So, they are used to power the dark reaction to _________________ which can store the energy for longer periods of time.
O2
ATP & NADPH
help build glucose
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ChloropIast
CO2 Enters the Cycle
Energy Input
5-CarbonMoleculesRegenerated
Sugars and other compounds
6-Carbon SugarProduced
D. The Calvin Cycle (dark reaction; light independent) * Occurs in the
Figure 8-11 Calvin Cycle
Stroma with or without light.
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DARK REACTION PROCESS: A. CO2 enters the system• • product=
B. Energy input• The _________________________________ are used to
C. 6-Carbon Sugar is produced• ___ of the 12 3-C are used to make glucose and other compounds.
D. 5-Carbon Molecules Regenerated• ___ remaining 3-C are converted into 6 5-C molecules
6 CO2 combines with 6 5-C compounds12 3-C compounds
ATP & NADPH (from the light reaction)convert the 12 3-C compounds into a higher energy form.
2
10
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PRODUCTS OF THE CALVIN CYCLE (DARK REACTION):*
E. Factors Affecting Photosynthesis* * Plants often have a ______ coating to protect against
* * The greater the _____________, the better photosynthesis functions (up to a point).
High Energy Sugars
Shortage of water can stop/slow down photosynthesis
waxy
Very low/high temperatures (damages enzymes) can stop/slow down photosynthesis (optimal temp.= 0°– 35° C
Light intensity
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Photosynthesis
includes
of
take place intakes place in uses
to produce to produce
use
Light-dependentreactions
Calvin cycle
Thylakoidmembranes Stroma NADPHATPEnergy from
sunlight
ATP NADPH O2 Chloroplasts High-energysugars
Section 8-3
Concept Map
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Section 23-4
Veins
Xylem
PhloemVein
Cuticle
Epidermis
Palisademesophyll
Epidermis
Stoma
Guardcells
Spongymesophyll
Figure 23–18 The Internal Structure of a Leaf
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Stomata Opening and ClosingStomata Opening and Closing