BIO CH7
Where is chlorophyll found in chloroplasts?
In thylakoids
What are the reactants for photosynthesis?
CO2 and H2O
The Calvin cycle makes direct use of ________ to make ________.
CO2, ATP, and NADPH; sugar
Identify the stroma.
E
What provides the carbon atoms that are incorporated into sugar molecules in the Calvin cycle?
Carbon dioxide (CO2)
The overall function of the Calvin cycle is __________.
making sugar
Chloroplasts contain several different pigments of different molecular shapes that absorb light of different wavelengths.
relationship of structure to function
When light strikes chlorophyll molecules, they lose electrons, which are ultimately replaced by other electrons obtained by __________.
splitting water
Identify a thylakoid.
D
When oxygen is released as a result of photosynthesis, what is its source?
Splitting of H2O
What provides the energy to drive the photosynthesis chemical reaction?
Sunlight
What is the end result of the Calvin cycle?
produces sugar
What connects the two photosystems in the light reactions?
An electron transport chain
Which of the following is produced by the light reactions of photosynthesis and is consumed by the Calvin cycle?
NADPH
Where does the energy for the Calvin cycle come from?
NADPH and ATP
Forests are considered carbon storage sinks because __________.
carbon dioxide is used in the Calvin cycle to make glucose, which is used to make wood and other tree molecules
The end products of photosynthesis are __________ and __________.
glucose ... molecular oxygen
The product of photosynthesis is ____.
sugar
The ultimate energy source that supports most life on Earth is __________.
sunlight
Do the data support Hypothesis 2 and its prediction--that plants grown at higher CO2 levels will produce higher concentrations of allergens? (yes or no)
yes
What relationship between these two variables would support the researchers' hypothesis? Choose the appropriate graph line at left and drag it onto the graph's axes at right.
/
Drag the labels onto the equation to identify the inputs and outputs of photosynthesis.
6 CO2 + 6 H2O + LIGHT ---> GLUCOSE + 6 02
Which of the following equations represents photosynthesis?
6CO2 + 6H2O → C6H12O6 + 6O2
Identify the chloroplast.
A
Figure Walkthrough: A Road Map for Photosynthesis The figure shows an overview of photosynthesis. Can you identify the inputs, outputs, and processes?
A) H2O B) CO2 C) light reactions D) calvin cycle E) NADPH F) O2 G) sugar
Can you place the labels in this concept map that summarizes the stages of photosynthesis?
A) chloroplasts B) chlorophyll C) light reactions D) ATP E) H2O F) O2 G) CO2
Complete the flow chart by selecting the hypothesis and predictions that follow from the question you're trying to answer. Not all labels will be used.
A) plants grown at higher CO2 levels will produce more pollen B) CO2 levels affect the concentration of protein allergens in ragweed pollen C) plants grown at higher CO2 levels will produce higher concentrations of allergies
First drag labels to the appropriate targets at the left to identify the parts of the chloroplast in this diagram. Then drag labels to the appropriate targets to identify the structures involved in the light reactions.
A) stroma B) thylakoid membrane C) thylakoid space D) 1st photosystem E) electron transport chain F) 2nd photosystem G) atp synthase
Which option properly summarizes the inputs and outputs of the Calvin cycle?
ATP + NADPH + 3CO 2 →→ G3P
The products of the light reactions of photosynthesis are ________.
ATP and NADPH
What two molecules are produced by the light reactions and used to power the Calvin cycle?
ATP and NADPH
___ and ___ store energy from the light reactions for use in the Calvin cycle.
ATP, NADPH
Which of the following are needed for the Calvin cycle?
ATP, NADPH, and carbon
Compare the electron transfer process of photosynthesis with the electron transfer chain of cellular respiration. Which of the following are similarities?
All of the listed responses are similarities.
What do cell respiration and photosynthesis have in common?
Both produce (and use) ATP.
Using the energy from light, what is the initial electron donor in photosynthesis?
Chlorophyll
In which of the following organelles does photosynthesis take place?
Chloroplast
What provides electrons for the light reactions?
H2O
Which molecule is the source of electrons for the light reactions?
H2O
What transports electrons from the light reactions to the Calvin cycle?
NADPH
Which molecule is produced during the light reactions of photosynthesis?
O2
One of the important waste products of photosynthesis is oxygen gas. Where does this oxygen gas come from?
Oxygen is released when water is broken down to extract electrons and protons for use in the light reactions.
A plant requires which of the following for growth?
Sunlight, H2O, and CO2
BioFlix Activity: Photosynthesis -- The Stages
TOP ROW: LIGHT, CO2 MIDDLE: LIGHT REACTIONS, CALVIN CYCLE BOTTOM: O2, ATP, GLUCOSE
What pathway in photosynthesis captures carbon dioxide?
The Calvin cycle
Plants need carbon, hydrogen, and oxygen atoms to synthesize organic molecules to make new leaves, roots, or stems. Which statement about where they get these atoms is correct?
The carbon atoms come from the air.
Why are leaves green?
The chlorophyll and other pigments reflect green light while absorbing other light.
Plants are photosynthetic autotrophs. What does this mean?
They use light energy to drive the synthesis of organic molecules.
____ is used in the light reactions, and ____ is used in the Calvin cycle.
Water, carbon dioxide
The rate of photosynthesis in an aquatic plant can be determined by the number of bubbles released from the plant. These bubbles ________.
are oxygen released when water is split
Photosynthetic organisms include __________.
both protists and bacteria
If the CO2 level increases above 600 µmol mol-1, how would ragweed pollen production and the allergen concentration change?
cannot tell from the data
Photosynthetic membranes are found in __________.
chloroplasts
Global climate change could be magnified by __________.
deforestation
To improve biofuel production, algae are exposed to mutation-promoting chemicals. This produces a highly varied collection of algae that can be screened for the ability to produce the most useful biofuel in the largest quantity. The tiny fraction of total algae that can best perform this task is grown and subjected to another round of mutation and selection. After many repetitions, the algae may slowly improve their ability to efficiently produce biofuels.
evolution
Incoming photons of light energy initiate photosynthesis by _____.
exciting electrons in pigment molecules within the photosystems, raising them to a higher energy level
The light reactions of photosynthesis take place ________.
in the thylakoid membrane
As the CO2 level increases up to 600 µmol mol-1, how does ragweed pollen production change?
increases
As the CO2 level increases up to 600 µmol mol-1, how does the ragweed allergen concentration change?
increases
Deforestation, which removes a lot of photosynthetic plant life, thereby reduces the ability of the biosphere to absorb carbon. Planting new forests can have the opposite effect of fixing carbon from the atmosphere, potentially reducing the effect of the gases that contribute to global climate change.
interactions within biological system
Refer to the accompanying figure. Plant cells that contain the organelle responsible for photosynthesis are concentrated in cells of the ________.
leaves
What part of a plant can be termed its "food factory"?
leaves
The thylakoid membranes bring together the components necessary to carry out the _____.
light reactions
Do the data prove that increased CO2 levels cause more severe ragweed allergies? (yes or no)
no
What are the products of photosynthesis?
oxygen and glucose
The light reactions produce _____.
oxygen, NADPH, and ATP
The carbon dioxide that enters a leaf is the source of carbon for much of the body of the plant, including the sugars and starches that we eat. So the bulk of the body of a plant derives from the air, not the soil.
pathways that transform energy and matter
Which of the following is the process that ultimately feeds the world?
photosynthesis
Stroma is the __________.
thick fluid found inside the chloroplast
What are the membranous sacs found within a chloroplast?
thylakoids
The light reactions take place in the _________ and the Calvin cycle takes place in the _________.
thylakoids; stroma
A student saw a bumper sticker with "Have you thanked a green plant today." This likely referred to ________.
without plants to produce oxygen, most organisms could not survive
Do the data support Hypothesis 1 and its prediction--that plants grown at higher CO2 levels will produce more pollen? (yes or no)
yes