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photosynthesis CA

Total questions: 138

Worksheet time: 2hrs 50mins

Name
Class
Date
1.
The heterotroph hypothesis explains
a)
how life on earth began
b)
how plants first evolved from heterotrophs
c)
how heterotrophs went extinct
d)
how heterotrophs evolved from plants
2.
What is the correct equation for photosynthesis?
a)
C6H12O6 + 6O2 --> 6CO2 + 6H2O
b)
6CO2 + 6O2 --> C6H12O6  + 6H2O
c)
 6CO2 + 6O2 --> 6H2O + C6H12O6
d)
6CO2 + 6H2O  -->  6O2 + C6H12O6
3.
What do the carbon reactions produce?
a)
O2, H2O, CO2
b)
ATP, Glucose, H2O
c)
NADPH, ATP, O2
d)
Glucose, NADP+, ADP + P
4.
What do the light reactions produce?
a)
ATP, NADPH, O2
b)
H2O, O2, Glucose
c)
NADP+, ADP + P, O2
d)
NADPH, H2O, ATP
5.
What leaf structure prevents water loss?
a)
spongy mesophyll
b)
cuticle
c)
stoma
d)
phloem
6.
What tissue contains cells where the majority of photosynthesis takes place?
a)
spongy mesophyll
b)
palisade mesophyll
c)
upper epidermis
d)
guard cells
7.
What can change shape to open and close the stoma?
a)
guard cells
b)
xylem
c)
phloem
d)
vascular bundle
8.
After sugars are formed in photosynthesis, what structure do they travel through to reach the fruits of the plant?
a)
xylem
b)
cuticle
c)
phloem
d)
roots
9.
What type of solutions would cause a guard cell to open?
a)
hypotonic
b)
hypertonic
10.
Which of the following environmental conditions would cause the stomata to close?
a)
Low CO2 level
b)
Rain
c)
K+ moving into the guard cells
d)
darkness
11.
What group of pigments break down later in the year and give leaves their orange, red, and yellow colors?
a)
carotenoids
b)
chlorophyll a
c)
chlorophyll b
d)
rhodopsin
12.
What color of light provides the most energy to a plant?
a)
orange
b)
red
c)
blue
d)
green
13.
What color of light reflects off of chlorophyll?
a)
orange
b)
red
c)
blue
d)
green
14.
Where do the light reactions take place inside a chloroplast?
a)
stroma
b)
lamellae
c)
chloroplast membrane
d)
thylakoid membrane
15.

What is produced in the stroma?

a)

ATP

b)

glucose/G3P

c)

O2

d)

CO2

16.

How do C4 plants prevent photorespiration?

a)

they close the stomata during the day

b)

they fix CO2 during the night

c)

they fix CO2 in a cell that does not contain RubisCO

d)

they fix CO2 in the guard cells

17.

Why do CAM plants grow much slower than other plants?

a)

they live in areas that do not have a lot of sunlight

b)

they live in areas that do not have a lot of water

c)

they can only fix CO2 during the night hours

d)

they can only fix CO2 during the day hours

18.

What enzyme fixes CO2 in C4 and CAM plants?

a)

ATP synthase

b)

rubisCO

c)

PEP carboxylase

d)

lactase

19.
Which organelle performs PHOTOSYNTHESIS?
a)
Chloroplast
b)
Mitochondria
20.
What is the ultimate ORIGINAL source of energy for living things
a)
Sugar
b)
Sun
c)
Moon
d)
Carbon Dioxide
21.
What are the products of photosynthesis?
a)
water and carbon dioxide
b)
oxygen and glucose
c)
oxygen and carbon dioxide
d)
oxygen and water
22.
What is the pigment in chloroplasts that performs photosynthesis?
a)
Chlorosynthesis
b)
Chlorophyll
c)
ADP
d)
Electron Transport
23.
Leaves look green because.....
a)
they eat their vegetables
b)
to blend into their environment
c)
they contain a molecule named chlorophyll
d)
they are sick
24.
What is the function of NADPH and ATP?
a)
They absorb light
b)
They power the light-dependent reactions
c)
They are light-reflecting pigments
d)
They are short term energy carriers
25.
After photosynthesis, plants store their energy as _________ .
a)
chlorophyll
b)
pigment
c)
glucose (sugar)
d)
Oxygen
26.
What gas goes into the plant before photosynthesis?
a)
Carbon Dioxide
b)
Carbon Monoxide
c)
Oxygen
d)
Nitrogen
27.

Where do the dark reactions (Calvin cycle) take place?

a)

thylakoid membrane

b)

lumen

c)

stroma

28.
What are the two products of the light reactions that are needed for the calvin cycle?
a)
NAD and NADPH
b)
NADP + and Glucose
c)
NADPH and ATP
d)
Oxygen and NADPH
29.
What is the main chemical compound that stores and releases energy?
a)
ATP
b)
Cytoplasm
c)
PTP
d)
Oxygen
30.
What do plants need for the photosynthesis process?
a)
a camera and tripod
b)
light, carbon dioxide, and water
c)
roots, flowers, and bees
d)
soil, air, and oxygen
31.
What is the main purpose of the light reactions?
a)
To provide the energy and electrons for the calvin cycle
b)
To capture energy and make sugar
c)
To reflect green light
d)
To make sugars
32.
What are the reactants of photosynthesis?
a)
carbon dioxide and oxygen
b)
water and oxygen
c)
carbon dioxide and water
d)
water and glucose
33.
The stacks of disks in the chloroplast are called:
a)
Lamellae
b)
Grana
c)
Stroma
d)
Thylakoid
34.
The interior space of the chloroplast is called:
a)
Lamellae
b)
Grana
c)
Stroma
d)
Thylakoids
35.
What is the main purpose of the light dependent reactions?
a)
To provide the energy for the calvin cycle
b)
To capture energy and make sugar
c)
To reflect green light
d)
To make sugars
36.

6CO2 + 6H2O ® C6H12O6 + 6O2

This chemical equation describes:

a)

Cellular respiration

b)

Glycolysis

c)

Photosynthesis

d)

Photolysis

e)

Electron Transport Chain

37.

2.The function accomplished by the light-dependent reactions is ______________.

a)

Energy and electron storage

b)

Sugar production

c)

Carbon fixation

d)

Conversion of sugar

38.

Where does dark reaction or light independent specifically occur?

a)

thylakoid membrane

b)

Stroma of the chloroplast

c)

Grana

d)

nuclear membrane

39.

Where does light dependent specifically occur?

a)

thylakoid membrane of the grana

b)

Stroma of the chloroplast

c)

mitochondria

d)

nuclear membrane

40.

What is/are the products of light independent reaction?

a)

ATP

b)

NADPH

c)

H2O

d)

C6H12O6

e)

pyruvate

41.

What is NOT the product of light dependent reaction?

a)

ATP

b)

NADPH

c)

H2O

d)

O2

42.

Which of the following light color is absorbed by plants?

a)

Red

b)

Green

c)

yellow

d)

Light green

43.

Which of the following statements does not describe Light independent reaction?

a)

aka Calvin cycle

b)

Produce ATP and NADPH

c)

Produce glucose

d)

Occur in the stroma of the chloroplast

e)

Use ATP and NADPH for the reaction

44.

•An enzyme that fixes carbon from atmosphere to convert it to complex macromolecule glucose.

a)

RuBP (Ribulose bisphosphate)

b)

RuBisCo (Ribulose Bisphosphate Carboxylase)

c)

PGA (3-Phosphoglycerate)

d)

G3P (Glyceraldeyhyde 3-Phosphate)

45.

•Plants and plant-like organisms make their own food or energy (glucose) from sunlight.

a)

Chemotrophs

b)

Heterotrophs

c)

Autotrophs

d)

Saprophytes

46.

•The organelle responsible for photosynthesis:

a)

Vacuole

b)

Chloroplast

c)

nuclear membrane

d)

mitochondria

e)

Cytoplasm

47.

How many G3P is needed to convert to a one molecule of glucose?

a)

1

b)

2

c)

3

d)

4

e)

5

48.

•Photosynthesis is a type of anabolic and exergonic reaction.

a)

True

b)

False

49.

C4 plants initially fix carbon dioxide in bundle sheath as 4 carbon long compounds then transported to mesophyll cells to undergo Calvin cycle.

a)

true

b)

false

50.
Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?
a)
CO2 and glucose
b)
H2O and O2
c)
electrons and H+
d)
ATP and NADPH
51.
Where does the Calvin cycle take place?
a)
stroma of the chloroplast
b)
thylakoid membrane
c)
outer membrane of the chloroplast
d)
interior of the thylakoid membrane
52.
When oxygen is released as a result of photosynthesis, it is a direct by-product of
a)
reducing NADP+
b)
splitting water molecules
c)
chemiosmosis
d)
electron transfer in photosystem II and I
53.
Which of the following events occurs in the light reactions of photosynthesis?
a)
NADP+ is produced
b)
ATP is consumed to yield ADP
c)
carbon dioxide is fixed in organic molecules
d)
light is absorbed and funneled to reaction-center chlorophyll a
54.
Which of the following is directly associated with Photosystem I?
a)
harvesting light energy to make ATP
b)
receiving electrons from the thylakoid membrane ETC
c)
generation of molecular oxygen
d)
extraction of hydrogen electrons from the splitting of water
55.
What is the primary function of cyclic electron flow?
a)
to produce additional NADPH
b)
to produce additional ATP
c)
to produce additional oxygen
d)
to produce additional carbon dioxide
56.
In a plant cell, where are ATP synthase complexes located?
a)
thylakoid membranes only
b)
inner mitochondrial membranes only
c)
thylakoid membrane and inner mitochondrial membranes
d)
thylakoid membrane and plasma membranes
57.
Which of the following statements about the relationship between photosynthesis and cellular respiration is true?
a)
In cellular respiration the biochemical pathways of photosynthesis run in reverse.
b)
In photosynthesis the biochemical pathways of cellular respiration run in reverse.
c)
Cellular respiration occurs only in animals and photosynthesis occurs only in plants.
d)
Cellular respiration is catabolic and photosynthesis is anabolic.
58.
Where are the molecules of the electron transport chain associated with photophosphorylation located in plant cells?
a)
thylakoid membanes of chloroplasts
b)
stroma of chloroplasts
c)
matrix of mitochondria
d)
outer membrane of chloroplasts
59.
In photosynthetic cells, synthesis of ATP by chemiosmosis occurs during
a)
photosynthesis only
b)
cellular respiration only
c)
both photosynthesis and cellular respiration
d)
photophosphorylation only
60.
What is the relationship between wavelength of light and the quantity of energy per photon?
a)
they have a direct, linear relationship
b)
they are inversely related
c)
they are logarithmically related
d)
they are only related in certain parts of the spectrum
61.
What is the primary function of the Calvin cycle?
a)
regenerate ATP for use in the light reactions of photosynthesis
b)
produce carbon dioxide for use in the light reactions of photosynthesis
c)
produce oxygen by oxidizing water
d)
produce simple sugars from carbon dioxide
62.
Where do the enzymatic reactions of the Calvin cycle take place?
a)
stroma of the chloroplast
b)
thylakoid membranes
c)
matrix of the mitochondria
d)
thylakoid space
63.
In C3 photosynthesis, the reactions that require ATP take place in
a)
the light reactions alone
b)
the calvin cycle only
c)
both the light reactions and the calvin cycle
d)
the citric acid cycle
64.
Reactions that consume CO2 take place in
a)
the light reactions of photosynthesis only
b)
the calvin cycle only
c)
the light reactions and the calvin cycle
d)
the calvin cycle and the citric acid cycle
65.
Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?
a)
The light reactions provide ATP and NADPH to the Calvin cycle, and the Calvin cycle returns ADP, ℗i, and NADP+ to the light reactions.
b)
The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the Calvin cycle provides water and electrons to the light reactions.
c)
The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP.
d)
The light reactions provide the Calvin cycle with oxygen for carbon fixation, and the Calvin cycle provides the light reactions with sugars to produce ATP.
66.
CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they
a)
fix CO2 into organic acids during the night when temperatures are cooler.
b)
fix CO2 into by combining it with RuBP in the Calvin cycle.
c)
obtain CO2 through their roots during the day.
d)
fix CO2 into organic acids in the mesophyll cells, which do not rely on stomata.
67.
Compared to C3 plants, C4 plants
a)
) have higher rates of photorespiration.
b)
can continue to fix CO2 even at relatively low CO2 concentrations and high oxygen concentrations.
c)
do not use rubisco for carbon fixation.
d)
grow better under cool, moist conditions.
68.
In chemiosmosis in mitochondria, protons flow from the intermembrane space into the matrix, whereas in chemiosmosis in chloroplasts, protons flow from
a)
stroma into the cytosol
b)
stroma to the thylakoid space
c)
thylakoid space to the stroma
d)
intermembrane space to the stroma
69.
In mitochondria, the electron transport chain pumps protons from the matrix into the intermembrane space, whereas in chloroplasts, the electron transport chain pumps protons from
a)
matrix to stroma
b)
stroma to thylakoid space
c)
intermembrane space to stroma
d)
thylakoid space to stroma
70.

Red and blue light support the highest rates of photosynthesis because

a)

Only wavelength that carotenoid cannot absorb

b)

Chlorophylls absorb light of these wavelengths more then other wavelengths

c)

Light of these wavelengths have the highest energy in the visible spectrum

d)

Light of these wavelengths activate ATP synthase enzyme

71.

Cyclic photophosphorylation differs from non-cyclic photophosphorylation in that ___________ is not made from the process

a)

ATP

b)

PGAL

c)

NADH

d)

NADPH

72.

Flattend sacs of internal membranes associated with photosynthesis are called

a)

Chloroplasts

b)

The stroma

c)

Cristae

d)

Thylakoids

73.

The role of water molecule in light dependent reaction is to

a)

Hydrolyse NADP+ at the end of the ETC

b)

Involve directly in the production of ATP

c)

Replace the excited electron of reaction centre molecule in photosystem II

d)

Involve directly in Calvin Cycle

74.

Which of the following molecule below is fixed during light dependent reaction?

a)

Oxygen

b)

Carbon dioxide

c)

ATP

d)

NADPH

75.

Which of the following plants fixes carbon dioxide at night?

a)

Sugarcane

b)

Cactus

c)

Oryza sativa

d)

Hibiscus rosa-sinensis

76.

How many carbon dioxide molecule must be added to RuBP to make a single molecule of glucose?

a)

3

b)

4

c)

5

d)

6

77.

In C4 plants, reactions that fix CO2 into four carbon compounds occur in

a)

Guard cells

b)

Epidermal cells

c)

Mesophyll cells

d)

Bundle-sheath cells

78.

Intermediate metabolite which is formed during the light independent reaction in photosynthesis is

a)

NADH

b)

Oxygen

c)

Ribulose bisphosphate

d)

Water

79.

In green plant photosynthesis, the electron donor for the light dependent reaction is

a)

carbon dioxide

b)

oxygen

c)

RuBP

d)

water

80.

The main function of the light dependent reactions is

a)

Produce glucose from CO2 and water

b)

Produce ATP and NADPH

c)

Produce NADPH only

d)

Convert light energy to chemical energy

81.

Calvin cycle takes place in

a)

Stroma

b)

Thylakoid membrane

c)

Cytoplasm

d)

Chlorophyll

82.

Why C4 plants are able to carry out photosynthesis efficiently?

a)

They do not involve in Calvin cycle

b)

They use PEP carboxylase to fix carbon dioxide

c)

They are adapted to cold climates

d)

They conserve water efficiently

83.

Photorespiration lowers the efficiency of photosynthesis by preventing the formation of

a)

Carbon dioxide molecules

b)

3-phosphoglycerate molecules

c)

ATP molecules

d)

Ribulose bisphosphate molecules

84.

In the Hatch Slack pathway, the first carbon dioxide acceptor is

a)

malate

b)

oxaloacetate

c)

phosphoenolpyruvate

d)

ribulose bisphosphate

85.

Rubisco binds with both carbon dioxide and oxygen in

a)

C3 plants

b)

C4 plants

c)

CAM plants

d)

C4 plants

86.

CAM plants keep stomata closed in daytime, thus reducing the loss of water. They can do this because

a)

fix CO2 into organic acids during the night

b)

fix CO2 into sugars in the bundle-sheath cells

c)

fix CO2 into pyruvate in the mesophyll cells

d)

use the enzyme phosphofructokinase, which outcompetes rubisco for CO2

87.

The reaction- center chlorophyll of photosystem is known as P700 because

a)

there are 700 chlorophyll molecules in the center

b)

the pigment best at absorbing light with a wavelength of 700 nm

c)

there are 700 photosystem I components to each chloroplast

d)

it absorbs 700 photons per microsecond

88.

Oxygen produced by photosynthesis comes directly from

a)

Light

b)

Carbon dioxide

c)

Glucose

d)

Water

89.

Which of the following does NOT occur during the Calvin Cycle

a)

carbon fixation

b)

oxidation of NADPH

c)

release of oxygen

d)

regeneration of the carbon dioxide acceptor

90.

If photosynthesizing green algae are provided with CO2 containing heavy oxygen (18O), later analysis will show that all of the following molecules produced by the algae contain 18O except

a)

glyceraldehyde 3-phosphate (G3P)

b)

glucose

c)

ribulose bisphosphate (RuBP)

d)

O2

91.

As a research scientist, you measure the amount of ATP and NADPH consumed by the Calvin cycle in 1 hour. You find 30,000 molecules of ATP consumed, but only 20,000 molecules of NADPH. Where did the extra ATP molecules come from?

a)

photosystem I

b)

photosystem II

c)

cyclic electron flow

d)

non-cyclic electron flow

92.

Suppose the interior of the thylakoids of isolated chloroplasts were made acidic and then transferred in the dark to a pH 8 solution. What would be likely to happen?

a)

The isolated chloroplasts will make ATP

b)

The Calvin cycle will be activated

c)

The isolated chloroplasts will generate oxygen gas

d)

The isolated chloroplasts will reduce NADP+ to NADPH

93.

A flask containing photosynthetic green algae and a control flask containing water with no algae are both placed under a bank of lights, which are set to cycle between 12 hours of light and 12 hours of dark. The dissolved oxygen concentrations in both flasks are monitored. Predict what the relative dissolved oxygen concentrations will be in the flask with algae compared to the control flask.

a)

The dissolved oxygen in the flask with algae will be higher in the light, but the same in the dark.

b)

The dissolved oxygen in the flask with algae will be higher in the light, but lower in the dark.

c)

The dissolved oxygen in the flask with algae will always be higher.

d)

The dissolved oxygen in the flask with algae will always be lower.

94.

The pH of the inner thylakoid space has been measured, as have the pH of the stroma and of the cytosol of a particular plant cell. Which, if any, relationship would you expect to find?

a)

The pH within the thylakoid is less than that of the stroma.

b)

The pH of the stroma is lower than that of the other two measurements.

c)

The pH of the stroma is higher than that of the thylakoid space but lower than that of the cytosol.

d)

The pH of the thylakoid space is higher than that anywhere else in the cell.

95.

What would be the expected effect on plants if the atmospheric CO2 concentration was doubled?

a)

All plants will experience increased rates of photosynthesis.

b)

C3 plants will have faster growth; C4 plants will be minimally affected.

c)

C4 plants will have faster growth; C3 plants will be minimally affected.

d)

C3 plants will have faster growth; C4 plants will have slower growth.

96.

Why are C4 plants able to photosynthesize with no apparent photorespiration?

a)

They do not participate in the Calvin cycle.

b)

They use PEP carboxylase to initially fix CO2.

c)

They conserve water more efficiently.

d)

They exclude oxygen from their tissues.

97.

CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they

a)

fix CO2 into organic acids during the night.

b)

fix CO2 into sugars in the bundle-sheath cells.

c)

fix CO2 into pyruvate in the mesophyll cells.

d)

use photosystem I and photosystem II at night.

98.

The alternative pathways of photosynthesis using the C4 or CAM systems are said to be compromises. Why?

a)

C4 compromises on water loss and CAM compromises on photorespiration.

b)

Both minimize photorespiration but expend more ATP during carbon fixation.

c)

CAM plants allow more water loss, whereas C4 plants allow less CO2 into the plant.

d)

C4 plants allow less water loss but CAM plants allow more water loss.

99.

If the carbon atom of each of the incoming CO2 molecules is labeled with a radioactive isotope of carbon, which organic molecules will be radioactively labeled after one cycle?

a)

C only

b)

B, C, D and E

c)

C, D and E

d)

B and C only

100.

To identify the molecule that accepts CO2, Calvin and Benson manipulated the carbon-fixation cycle by either cutting off CO2 or cutting off light from cultures of photosynthetic algae. They then measured the concentrations of various metabolites immediately following the manipulation. How would these experiments help identify the CO2 acceptor? Study Figure 8.2 to help you in determining the correct answer.

a)

The CO2 acceptor concentration would decrease when either the CO2 or light is cut off.

b)

The CO2 acceptor concentration would increase when either the CO2 or light is cut off.

c)

The CO2 acceptor concentration would increase when the CO2 is cut off, but decrease when the light is cut off.

d)

The CO2 acceptor concentration would decrease when the CO2 is cut off, but increase when the light is cut off.

101.

Theodor W. Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He noted that the largest groups were found in the areas illuminated by the red and blue light.


What did Engelmann conclude about the congregation of bacteria in the red and blue areas?

a)

Bacteria congregated in these areas due to an increase in the temperature of the red and blue light.

b)

Bacteria congregated in these areas because these areas had the most oxygen being released.

c)

Bacteria are attracted to red and blue light and thus these wavelengths are more reactive than other wavelengths.

d)

Bacteria congregated in these areas due to an increase in the temperature caused by an increase in photosynthesis.

102.

Theodor W. Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He noted that the largest groups were found in the areas illuminated by the red and blue light.


If you ran the same experiment (mentioned above) without passing light through a prism, what would you predict?

a)

The bacteria would be relatively evenly distributed along the algal filaments.

b)

The number of bacteria present would decrease due to an increase in the carbon dioxide concentration.

c)

The number of bacteria present would increase due to an increase in the carbon dioxide concentration.

d)

The number of bacteria would decrease due to a decrease in the temperature of the water.

103.

A spaceship is designed to support animal life for a multiyear voyage to the outer planets of the solar system. Plants will be grown to provide oxygen and to recycle carbon dioxide. Because the spaceship will be too far from the sun for photosynthesis, an artificial light source will be needed.


What wavelengths of light should be used to maximize plant growth with a minimum of energy expenditure?

a)

full-spectrum white light

b)

green light

c)

a mixture of blue and red light

d)

yellow light

104.

A spaceship is designed to support animal life for a multiyear voyage to the outer planets of the solar system. Plants will be grown to provide oxygen and to recycle carbon dioxide. Because the spaceship will be too far from the sun for photosynthesis, an artificial light source will be needed.


A gardener is concerned that her greenhouse is getting too hot from too much light, and seeks to shade her plants with colored translucent plastic sheets, the color of which allows passage of only that wavelength. What color should she use to reduce overall light energy, but still maximize plant growth?

a)

green

b)

blue

c)

yellow

d)

orange

105.

Which of the following shows the balanced chemical symbol equation for photosynthesis?

a)

A

b)

B

c)

C

d)

D

106.

What is the main energy change that happens in photosynthesis?

a)

chemical --> light

b)

light --> kinetic

c)

light --> chemical

d)

kinetic --> light

107.

Where is chlorophyll found in plant cells?

a)

cytoplasm

b)

chloroplast

c)

mitochondria

d)

vacuole

108.

What substance can glucose be converted to, which is the transport carbohydrate of plants?

a)

starch

b)

cellulose

c)

sucrose

d)

amino acids

109.

What substance can glucose be converted into, which is the energy storage carbohydrate of plants?

a)

cellulose

b)

sucrose

c)

amino acids

d)

starch

110.

Which substance can glucose be converted to, which strengthens plant cell walls?

a)

starch

b)

cellulose

c)

amino acids

d)

sucrose

111.

Which of the following organelles would you not expect to be present in onion root cells?

a)

cell wall

b)

vacuole

c)

chloroplast

d)

mitochondrion

112.

Click on the picture to make it larger.


Which of the following can you conclude about point X from this graph alone?


I. light intensity limits the rate of photosynthesis

II. as light intensity increases, rate of photosynthesis increases

III. CO2 concentration limits the rate of photosynthesis

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

113.

Click on the picture to make it larger.


Which of the following can you conclude about point Y from this graph?


I. light intensity does not limit the rate of photosynthesis

II. the plant has stopped photosynthesising

III. the rate of photosynthesis could be limited by a shortage of water or CO2

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

114.

Click on the picture to make it larger.


What do curves C and D suggest is limiting the rate of photosynthesis?

a)

light intensity

b)

carbon dioxide concentration

c)

temperature

d)

water

115.

Click on the picture to make it larger.


What do curves B and D suggest is limiting the rate of photosynthesis?

a)

light intensity

b)

carbon dioxide concentration

c)

temperature

d)

water

116.

Supplying extra heat and carbon dioxide is more expensive, but may be worth it if the rate of photosynthesis greatly increases.


Click on the graph to make it larger.


Which of the following would it not be worth doing for a plant grower?

a)

increasing the CO2 from 0.03% to 0.1% at a temperature of 20oC.

b)

increasing the CO2 from 0.03% to 0.1% at a temperature of 25oC.

c)

increasing the temperature from 20oC to 25oC at a CO2 concentration of 0.03%

d)

increasing the temperature from 20oC to 25oC at a CO2 concentration of 0.1%

117.

Why is the chemical sodium hydrogencarbonate given to water plants in photosynthesis practicals?

a)

it is used to produce chlorophyll

b)

it allows the plant to respire

c)

it supplies the plant with CO2 gas when it dissolves

d)

it is a source of glucose

118.

Four test-tubes are set up as shown.


Click on the picture to make it larger.


Which test-tube contains the most carbon dioxide after one hour?

a)

A

b)

B

c)

C

d)

D

119.

The products of the light reactions of photosynthesis that are utilized in the Calvin cycle are:

a)

O2 & ATP

b)

ATP and NADPH

c)

Glucose and O2

d)

CO2 & H2O

120.

Where does the Calvin cycle take place?

a)

thylakoid membrane

b)

chlorophyll molecule

c)

cytoplasm surrounding the chloroplast

d)

stroma of the chloroplast

121.

In any ecosystem, terrestrial or aquatic, what group is always necessary?

a)

autotrophs

b)

green plants

c)

photosynthesizers

d)

decomposers.

122.

Oxygen is released as a result of photosynthesis. Oxygen is a by-product of which of the following?

a)

chemiosmosis

b)

splitting the water molecules

c)

the electron transfer system of photosystem I

d)

the electron transfer system of photosystem II

123.

A plant has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are being absorbed by this pigment?

a)

blue and violet

b)

red and yellow

c)

blue, green, and red

d)

green, blue, and yellow

124.

In the thylakoid membranes, the main role of the antenna pigment molecules is to...

a)

synthesize ATP from ADP and Pi

b)

transfer electrons to the primary electron acceptor.

c)

split water and release oxygen to the reaction-center chlorophyll

d)

absorb photons and transfer light energy to the reaction-center chlorophyll

125.

The reaction-center chlorophyll of photosystem I is known as P700 because

a)

it absorbs 700 photons per microsecond.

b)

it reflects light with a wavelength of 700 nm.

c)

there are 700 chlorophyll molecules in the center.

d)

it best at absorbing light with a wavelength of 700 nm.

126.

Which of the events listed below occur in the light reactions of photosynthesis?

a)

only NADP is produced.

b)

NADPH is reduced to NADP+.

c)

O2 is the last electron acceptor.

d)

light is absorbed and transferred to reaction-center chlorophyll a.

127.

Which statement describes the functioning of photosystem II?

a)

The splitting of water yields CO2 as a by-product.

b)

The electron vacancies in P680 are filled by electrons derived from water.

c)

The splitting of water yields H+ ions that releases into the stroma.

d)

The P680 chlorophyll donates a pair of protons to NADPH, which is thus converted to NADP+.

128.

In a plant cell, where are the ATP synthase complexes located?

a)

thylakoid membrane

b)

plasma membrane

c)

inner mitochondrial membrane

d)

thylakoid membrane & cristae

129.

In chloroplasts, chemiosmosis involves the proton pumps to pump protons from

a)

the matrix to the stroma.

b)

the stroma to the thylakoid space.

c)

matrix into the intermembrane space.

d)

the intermembrane space to the thylakoid space.

130.

Where are the molecules of the electron transport chain found in plant cells?

a)

stroma of chloroplasts

b)

outer membrane of chloroplast.

c)

inner membrane of chloroplasts

d)

thylakoid membranes of chloroplasts

131.

Synthesis of ATP by the chemiosmotic mechanism occurs during

a)

respiration only.

b)

photosynthesis only.

c)

both photosynthesis and respiration.

d)

both photosynthesis and photorespiration

132.

What is the relationship between wavelength of light and the quantity of energy per photon?

a)

They are inversely related.

b)

They are separate phenomena.

c)

They have a direct, linear relationship.

d)

They are only related in certain parts of the spectrum.

133.

Carotenoids are often found in foods that are considered to have antioxidant properties in human nutrition. What related function do they have in plants?

a)

They reflect orange light.

b)

They serve as accessory pigments.

c)

They dissipate excessive light energy.

d)

They take up toxins from the water.

134.

Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?

a)

The light reactions provide ATP and NADPH to the Calvin cycle, and the cycle returns ADP, Pi, and

NADP+ to the light reactions.

b)

The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the cycle

provides water and electrons to the light reactions.

c)

The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the

light reactions with sugars to produce ATP.

d)

The light reactions provide the Calvin cycle with oxygen for electron flow, and the Calvin cycle provides

the light reactions with water to split.

135.

What is the primary function of the Calvin cycle?

a)

transport RuBP out of the chloroplast

b)

synthesize simple sugars from carbon dioxide

c)

use ATP and NADPH to release carbon dioxide

d)

synthesize simple sugars from carbon dioxide and water

136.

In the process of carbon fixation, RuBP attaches a CO2 to produce a 6 carbon molecule, which is then split in two. After phosphorylation and reduction, what more needs to happen in the Calvin cycle?

a)

a gain of NADPH.

b)

regeneration of RuBP.

c)

regeneration of rubisco.

d)

all the G3P produced will leave the cycle.

137.

Why are C4 plants able to photosynthesize with no apparent photorespiration?

a)

They conserve water more efficiently.

b)

They do not participate in the Calvin cycle.

c)

They use PEP carboxylase to initially fix CO2.

d)

They will close their stomata during hot dry days.

138.

CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they..

a)

produce sugar during the night.

b)

fix CO2 into sugars in the bundle-sheath cells.

c)

fix CO2 into organic acids during the night in the mesophyll cell.

d)

fix CO2 into organic acids during the night in the bundle-sheath cells.

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