If you wanted to install lights to grow plants indoors, the type of light would you want to use is

visible light, because it has low energy wavelengths.

ultraviolet, because it has high energy wavelengths.

gamma rays, because it has high energy wavelengths.

microwaves, because it has low energy wavelengths.

infrared, because it has high energy wavelengths.

A green plant is first grown in blue light and then in green light. The likely outcome for photosynthesis in both phases is

Increased plant growth in blue light and no plant growth in green light.

No plant growth in blue light and increased plant growth in green light.

Decreased plant growth in blue light and no plant growth in green light.

No plant growth in blue light and decreased plant growth in green light.

both light reactions and the Calvin cycle.

neither the light reactions nor the Calvin cycle.

NADPH production is not a part of photosynthesis.

A comparison of mitochondria and chloroplasts shows that

both generate ATP via an H+ electrochemical gradient.

they have very different electron transport protein complexes.

only mitochondria contain ATP synthase.

both use an increase in pH in their inner-membrane space to produce ATP.

both use oxygen as a final electron acceptor.

What would happen to a plant that is treated with a chemical that prevents electrons from moving through the electron transport chain?

It could not generate an electrochemical H+ gradient across a membrane.

It could no longer produce CO2.

Water would be broken down to form oxygen at a higher rate to compensate.

More electrons would be available for the light harvesting array.

What is the main role of the pigment molecules within the antenna or light-harvesting complex?

Absorb photons and transfer light energy to the reaction center chlorophyll.

Oxidize water and release oxygen to the reaction center chlorophyll.

Pass electrons to the electron transport chain and then to NADPH.

Increase H+ concentration in the stroma.

The process that forms the electrochemical gradient during photosynthesis is the

pumping of H+ into the thylakoid lumen.

production of water from oxygen in the thylakoid lumen.

production of H+ in the stroma during NADPH production.

Which portion of the photosynthetic apparatus absorbs light?

both photosystem I and photosystem II

both photosystem I and NADP reductase

How might a plant cope with the fact that the Calvin cycle uses more ATP than NADPH, yet produces roughly the same amount of both energy intermediates in photosystems I and II?

Photosynthesis can revert from a noncyclic to cyclic electron flow, producing more ATP than NADPH.

More pigment can be rapidly created for greater photosynthetic capacity, producing equal amounts of ATP and NADPH.

Plants often increase the amount of NADP reductase, thereby increasing NADPH production to match ATP output.

Electron flow rate can be increased, increasing both ATP and NADPH production.

Increase the electrochemical gradient for H+ across the thylakoid membrane, producing more ATP but not NADPH.

Both ATP and NADPH are required for

electron transport through the thylakoid membrane.

both the light reaction and Calvin cycle.

neither the light reaction nor the Calvin cycle.

Using 14CO2 as a radioactive tracer, which molecule would be the last to incorporate 14C within the Calvin cycle?

glyceraldehyde-3-phosphate (G3P)

1,3-biphosphoglycerate (1,3-BPG)

Products of the Calvin cycle include: Check all that apply.

glyceraldehyde-3-phosphate (G3P)

tends to occur under dry and hot conditions.

uses a 3-carbon sugar precursor to produce oxygen.

uses the enzyme PEP carboxylase rather than rubisco to produce 3-phosphoglycerate.

Succulent plants such as cacti or pineapple

produce 4-carbon malate in the first step of carbon fixation.

are highly efficient at photosynthesis in cooler and wet environments.

tend to undergo substantial rates of photorespiration.

continually produce sugar, both day and night under hot, arid conditions.

CAM (crassulacean acid metabolism) plants such as cacti differ from standard C4 plants such as corn in which of the following ways?

CAM plants are limited to producing CO2 for the Calvin cycle during the day, while C4 plants produce CO2 for the Calvin cycle both during the day and at night.

CAM plants minimize photorespiration whereas C4 plants do not.

CAM plants use both mesophyll and bundle sheath leaf cells for photosynthesis whereas C4 plants do not.

CAM plants are more efficient at producing sugar than C4 plants regardless of environmental conditions.

CAM plants produce a 4-carbon molecule in the first step of carbon fixation, but C4 plants do not.

The primary advantage C4 plants have over C3 plants is that

C4 plants minimize photorespiration compared with C3 plants.

C4 plants can produce sugars more efficiently than C3 plants under cool, wet conditions.

C4 plants can produce CO2 needed for sugar production in the Calvin cycle more efficiently than C3 plants.

Relative to C3 plants, C4 plants can keep their stomata open more frequently to limit water evaporation.

If a C3 plant that normally closes its stomata during hot, dry conditions were triggered to open them instead, the most likely outcome would be that

Water leaves the leaf, decreasing the rate of photosynthesis.

O2 enters the leaf, increasing the rate of photosynthesis.

CO2 enters the leaf, decreasing the rate of photosynthesis.

Glucose leaves the leaf, increasing the rate of photosynthesis.

More chlorophyll is made, increasing the rate of photosynthesis.

Photosynthesis Quiz

Authored by J A

Biology

University

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The ultimate source of energy for photosynthetic reactions in a plant is

glucose.

glycogen.

plants.

the sun.

catabolism.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The organisms that most specifically utilize light energy to make organic molecules from inorganic molecules are

photoautotrophs.

photoheterotrophs.

photoisotrophs.

photohemitrophs.

heterotrophs.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

________ consume organic molecules to live.

Photoautotrophs

Autotrophs

Hemitrophs

Heterotrophs

Plants

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the reaction, 6CO2 + 6H2O →C6H12O6 + 6O2, which side should energy be placed on?

the left side; this is an endergonic reaction.

the left side; this is an exergonic reaction.

the right side; this is an endergonic reaction.

the right side; this is an exergonic reaction.

neither side; the reaction is in equilibrium.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The equation, 6CO2 + 6H2O →C6H12O6 + 6O2, describes which of the following processes?

photosynthesis

light reaction

Calvin cycle

nitrogen fixation

aerobic respiration

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In which organelle of the plant does photosynthesis takes place?

mesophyll

chloroplast

thylakoid membrane

grana

mitochondria

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The main structure for gas exchange in plants is called the

mesophyll.

chloroplast.

stomata.

epidermis.

root.

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Photosynthesis Quiz

The ultimate source of energy for photosynthetic reactions in a plant is

The organisms that most specifically utilize light energy to make organic molecules from inorganic molecules are

________ consume organic molecules to live.

In the reaction, 6CO2 + 6H2O →C6H12O6 + 6O2, which side should energy be placed on?

The equation, 6CO2 + 6H2O →C6H12O6 + 6O2, describes which of the following processes?

In which organelle of the plant does photosynthesis takes place?

The main structure for gas exchange in plants is called the

A new flower species has a unique photosynthetic pigment. The leaves of this plant appear to be blue-green. What wavelengths of visible light does this pigment reflect?

If you wanted to install lights to grow plants indoors, the type of light would you want to use is

A green plant is first grown in blue light and then in green light. The likely outcome for photosynthesis in both phases is

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