Plant Respiration and Photosynthesis

Plant Respiration and Photosynthesis 012-10974 r1.04

The Snapshot button is used to capture the screen.

The Journal is where snapshots are stored and viewed.

The Share button is used to export or print your journal to turn in your work.

IntroductionJournals and Snapshots

Plant Respiration and Photosynthesis

Each page of this lab that contains the symbol

should be inserted into your journal. After completing a lab page with the snapshot symbol, tap (in the upper right hand corner) to insert the page into your journal.

Note: You may want to take asnapshot of the first page ofthis lab as a cover page for your journal.

Lab Challenge• Do plants perform cellular respiration

in addition to photosynthesis?


BackgroundPhotosynthesis• The process of photosynthesis occurs in the chloroplasts of plants.

• Light is necessary for the entire photosynthesis process to occur.

• The formula for photosynthesis is:

6CO2 + 6H2O + LIGHT ENERGY ----> C6H12O6 + 6O2

• Carbon dioxide, water, and light are required to produce glucose and oxygen.


This image is a reminder totap to take a snapshot of the page after you have entered your response.

Self Check

1. If you were measuring carbon dioxide levels in a terrarium during photosynthesis, you would expect to see the levels ________.

a) increase

b) decrease

c) stay the same


...BackgroundCellular Respiration• The process of cellular respiration occurs in the mitochondria of ALL cells.

• Cellular respiration converts the glucose made by photosynthesis into ATP (adenosine triphosphate), which is the energy source that is usable by cells.

• The formula for cellular respiration is:

C6H12O6 + 6O2 ----> 6CO2 + 6H2O + Energy (ATP molecules)

• Glucose and oxygen produce carbon dioxide, water and ATP.


Self Check2. If carbon dioxide levels were being monitored

inside a terrarium, you would expect to see an increase in CO2 levels when the plants were in ___________.

a) darkness

b) light

c) Canada


Safety• Follow all common lab safety procedures.

• Do not allow the CO2 sensor to get wet!


Materials and EquipmentCollect all of these materials before beginning the lab.

• PASPORT CO2 Gas Sensor• Sensor extension cable• Sampling bottle (included with the

sensor)• Large beaker or aquarium (to act

as a heat sink)

• Box or heavy cloth• Aluminum foil• Lamp, 100-watt• Mint plant• Water, 1 L


The steps to the left are part of the procedure for this lab activity. They are not in the right order. Determine the correct sequence of the steps, then take a snapshot of this page.

Sequencing Challenge

A. Cover the bottle with a box or cloth and record CO2 production in the dark.

B. Record CO2 production when the plant is exposed to the light.

C. Analyze the changes in CO2 production in dark vs. light.

D. Add several stems and leaves of a small plant into the sampling bottle.


Setup: Darkness1. Attach the Carbon Dioxide Gas Sensor to a

sensor extension cable and connect it to the SPARK Science Learning System.

2. Add 25 mL of water to the sample bottle.3. Gently push several stems of the plant into the

sampling bottle. Try to arrange the leaves so that they are facing outward.

4. Calibrate the sensor by pushing and releasing the green button on the sensor. When the green light in the button begins flashing again, the sensor is calibrated.


Prediction: GeneralQ1: Why do you think that water is needed in the sample bottle?


Q2: What do you think will happen to the CO2 level in the bottle while the plant is in the dark? Explain why.

Collect Data: Darkness

1. Place the CO2 Gas Sensor firmly into the sampling bottle.

2. Carefully cover the sample bottle with a box or heavy cloth to block out any light.

3. Tap to begin data collection.

4. Record data for 10 minutes and then tap to stop data collection.



Q2: What is the purpose of the aluminum foil?

Q3: What is the purpose of the beaker/ aquarium full of water?

Setup: Light1. Remove the cloth or box from the sampling bottle

and place the bottle on aluminum foil.

2. Place a large beaker of water or aquarium between the light source and the beaker.

3. Turn on the light source and wait 3 minutes to allow photosynthesis to begin.


Q4: What do you think will happen to the CO2 level in the bottle while the plant is in the light? Explain why.

Collect Data: Light

1. Tap to begin data collection.

2. Record data for 10 minutes and then tap to stop data collection.


Data AnalysisPlant Respiration and Photosynthesis

1. Determine the change in CO2 concentration for both runs, and record the information in the data table on the next page.

* To Find the Difference Between Two Data Points:

2. Tap to open the tools palette.

3. Tap and then tap two points on the data run.

4. Adjust using both buttons and then tap

5. Tap to display the differences.

Data Analysis2. Record the initial, final,

and change in CO2 concentration for all runs, in the data table to the left.

*To Enter Data into a Table: 1. Tap to open the tool

palette.2. Tap then tap a cell in the

data table to highlight it in yellow.

3. Tap to open the Keyboard screen.


Analysis1. What happens to the level of carbon dioxide gas when the plant is in the

darkness? Why does this happen?


2. What happens to the level of carbon dioxide gas when the plant is in bright light? Why does this happen?


Analysis

3. Was there greater change in the level of carbon dioxide in the darkness or light? Explain.


Analysis

Synthesis1. What part of the activity shows the effect of cellular respiration on carbon

dioxide levels in the chamber?


2. What is meant by the term "Carbon Cycle" in this activity?


Synthesis

3. Explain how photosynthesis and cellular respiration are dependent on one another.


Synthesis

4. If plants are able to photosynthesize, why do they also have to go through cellular respiration?


Synthesis

5. Write a conclusion for this experiment based on the following question, "Does the level of carbon dioxide gas produced in a closed environment change in dark and in bright light conditions?"


Synthesis

Multiple Choice1. Which of the following are required for

photosynthesis to occur?

a) light

b) chloroplasts

c) carbon dioxide

d) all of the above


Multiple Choice2. Respiration can occur in a plant ____________.

a) in the light

b) in the dark

c) when oxygen is present

d) all of the above


Multiple Choice3. When a bright light is turned on a plant, which

reaction(s) take place?

a) photosynthesis only

b) cellular respiration only

c) photosynthesis and cellular respiration

d) nothing


a) respiration then photosynthesis

b) photosynthesis then respiration

c) light-dependent reactions only

d) light-independent reactions only

Multiple Choice4. What is shown in the graph of CO2

concentration vs. Time for a plant?


You have completed the lab.Congratulations!

Please remember to follow your teacher's instructions for cleaning-up and submitting your lab.


Images are taken from PASCO documentation, public domain clip art, or Wikimedia Foundation Commons

http://commons.wikimedia.org/wiki/File:Narzisse.jpghttp://commons.wikimedia.org/wiki/File:Peppermint_and_Corsican_mint_plant.jpghttp://commons.wikimedia.org/wiki/File:Rose_Geranium.jpghttp://commons.wikimedia.org/wiki/File:Sunflowers.jpg

ReferencesPlant Respiration and Photosynthesis

Documents

Plant Respiration and Photosynthesis