Questions will be

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REMINDERS

Partner quiz will be collected TODAY - Please place ONE

partner’s quiz in the center for collection

Grading and OH this week

Missing Lab #13 - Estrada, Molano, Ochiagha, Barron, Islam, Janjua, Dinsae, Grunblatt, Jaskaran, Nau, Pula, Salah, Santana, Stevens, Williams

Careers in Medicine Night - TONIGHT - 5:15 pm Room 154

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Lesson 5: Light and dark reactions of photosynthesis

Photosynthesis is the process of converting ____________ into

_________________.

This process involves 2 steps. We call these the light and dark reactions.

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NADP+ is an empty electron carrier

NADPH is formed when the electron is picked up

Step 1 Step 2

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photosystem = structural + functional units in

proteins that absorb light

& control energy transfer (electrons)

enzymes

REDUCTION

Light-dependent reaction (Step 1)

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Light hits 1st photosystem →

excited e- transfer to primary e- acceptor.

e- replaced by

splitting of H2O to yield O2 as waste product.

excited e- travel down ETC.

pumps H+

across

membrane into thylakoid.

light excited e- in photosystem 2 transferred to NADP+. e-

replaced by ETC.

backflow of H+ ions out of thylakoid powers

ATP

production.

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Warm-up

Read over IA review document silently

Questions will be

answered after warm-up

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H2O Light

O2 ATP NADPH NADPH

CO2 ATP

NADP+

Glucose ADP + P

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Assign Group Roles [G]

Understanding manager Presenter

Accountable Talk Manager

Presenter - record names and role on log!

Check out the collaboration rubric!

Self-assessment tool

AIM: How do photolysis and carbon fixation occur in the light-dependent and light-independent reactions of photosynthesis?

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TASK: Complete Light-Dark GO Models #1 and #2 ONLY Pause and check with Ms. B when complete

1.Understanding Manager- Check group understanding &

pace. Ask 3 before you ask me!

2.Presenter- Keeps log of important concepts learned or ? 3. Accountable Talk - Talk on task using given prompts

4. Reader - Read all directions and questions aloud!

AIM: How do photolysis and carbon fixation occur in the light-dependent and light-independent reactions of

photosynthesis?

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Monday, March 31 R1

Warm-up [S]

Sit next to the partner who you worked on the photosynthesis partner quiz with.

Take out your IA review document and turn to the page where possible essay choices are listed

Rank the essay possibilities as follows:

1 - I feel most comfortable with this set of essays

2 - I feel moderately comfortable with this set of essays 3 - I feel the least comfortable with this set of essays

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Partner-brainstorm: Essays for IA3 [P]

Time allotted: 25 minutes

Take out a sheet of looseleaf. Title it IA#3 Essays With your partner, identify the 3-part essay for which you both feel the least comfortable.

Begin brainstorming possible marks for this 3-part essay. Use your notes! When you are finished, you may move on to the essay ranked #2.

FYI: SCIENCE IA IS OFFICIALLY MOVED TO THURSDAY

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Partner-review: Cell respiration and photosynthesis partner quizzes [G]

Look over your cell respiration quiz and your photosynthesis partner quiz.

Make sure that your partner has the same feedback on his or her partner quiz for when he/she uses it to study!

Have questions about why an answer did not receive full marks? Ask 3 before you ask Ms. B!

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HOMEWORK [S]

Complete steps 1-3 of the homework for

TOMORROW

(TUESDAY, APRIL 1)

Expectation: Make the best use of your time.

This is completed

silently and individually

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Monday, March 31 R6, R9

Warm-up [S]

1. Sit next to the partner who you worked on the photosynthesis partner quiz with.

2. Take out your POGIL GO (Models 1-3) labeled:

Photosynthesis – Light and Dark Reactions

AIM: How do photolysis and carbon fixation occur in the light-dependent and light-independent

reactions of photosynthesis?

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TASK: Complete Light-Dark GO Model #3 ONLY Check with Ms. B when complete

1.Understanding Manager- Check group understanding &

pace. Ask 3 before you ask me!

2.Presenter- Keep log of important concepts learned or ? 3. Accountable Talk - Talk on task using given prompts 4. Reader - Read all directions and questions aloud!

YOU HAVE 25 MINUTES TO COMPLETE MODEL 3!

AIM: How do photolysis and carbon fixation occur in the light-dependent and light-independent reactions of

photosynthesis?

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OVERVIEW - THE BIG PICTURE Cell

respiration

Photosynthesis

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Partner-review: Cell respiration and photosynthesis partner quizzes [G]

Look over your cell respiration quiz and your photosynthesis partner quiz.

Make sure that your partner has the same feedback on his or her partner quiz for when he/she uses it to study!

Have questions about why an answer did not receive full marks? Ask 3 before you ask Ms. B!

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HOMEWORK [S]

Complete steps 1-3 of the homework for

TOMORROW (TUESDAY, APRIL 1)

Expectation: Make the best use of your

time. Complete this silently & individually

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Tuesday, April 1 R1, R6, R9

Warm-up [S]

Take out your homework from last night

Lesson 7: How do limiting factors affect rate of photosynthesis?

3.8.8 Outline the effects of temperature, light intensity and carbon dioxide concentration on the

rate of photosynthesis.

Compare your definition of a limiting factor to a

partner’s definition at your table.

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Pair-share your answers to HOMEWORK STEP 2 [P]

Predict what you expected the trend line to show for the effect of

1. temperature on the rate of photosynthesis.

2. light intensity on the rate of photosynthesis.

3. carbon dioxide on the rate of photosynthesis.

Provide an explanation for your prediction.

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Limiting factor

a factor that limits the growth or development of an organism, population, or process

(photosynthesis)

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TASK: Complete Factors Affecting Rate of Photosynthesis GO [P]

Complete #1 and #2 for each factor

Pause when you get to analysis questions. Call Ms. Bautista over to check. Once this has been checked, you can move on to finish analysis

questions.

YOU HAVE 15 MINUTES TO COMPLETE THIS GO

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Temperature

WHY?

biological rxn = ENZYMES!

(a) Increasing rate as the KE of reactants increases.

(b) Max rate of reaction of photosynthesis @ 'optimal' temp

(c) Decrease in rate as

enzymes become unstable and denature.

Have you seen a graph like me before?

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Have you seen a graph like me before?

Carbon dioxide concentration

WHY? CO2 = reactant (a) O2 is used up as the plant is not photosynthesising but only

respiring.

(b) As [CO2] ^, rate ^.

(d) Max rate of photosynthesis (e) Range of values = different plants reaching saturation level with carbon dioxide. Once

saturation level has been reached there is no further increase in the rate of photosynthesis.

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Light intensity

WHY? reactant (light E absorbed by chlorophyll converted to ATP and H+) (a) low light levels, plant is respiring only

(b) as light intensity ^, rate ^ (c ) high light intensities, rate becomes constant. With

further increases in light intensity there are no increases in the rate.

Plant is unable to harvest light at these high

intensities. Chlorophyll can become damaged!

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Analysis Q #1

(b)​oxygen: ​released / waste product/ used in respiration / specific reference to where used in respiration;

hydrogen: used in production of organic molecules /

sugars / to fix / combine with carbon dioxide /

specific reference to where used in photosynthesis any response with a lower plateau

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Analysis Q #2

(a) O2 because a product of

photosynthesis

(b) O2 is a product of photosynthesis and therefore the more O2 ...

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Analysis Q #3

Graphs are different shapes because

enzymes will reach

denaturation whereas carbon dioxide and

light intensity will reach a saturation point

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Would you like extra practice with this assessment statement?

Visit

http://www.media.pearson.com.

au/schools/cw/au_sch_linstead_sa3_1/int/

photosynthesis.html

for an online, interactive experiment to view these limiting factors!

Figure

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References

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