What is the function of carotenoids in photosynthesis?

They supplement chlorophyll absorption.

They are visible in the fall during leaf color changes.

They absorb excess energy and dissipate it as heat.

They limit chlorophyll absorption.

Which order of molecular conversions is correct for the Calvin cycle?

RuBP+CO2→[RuBisCO]3-PGA→G3P

Which statement correctly describes carbon fixation?

the conversion of CO2 into an organic compound

the use of RuBisCO to form 3-PGA

the production of carbohydrate molecules from G3P

the use of ATP and NADPH to reduce CO2

What is the role of rribulose 1,5, bisphosphate carboxylase/oxygenase, abbreviated RuBisCO, in photosynthesis?

It catalyzes the reaction between CO2 and ribulose bisphosphate (RuBP).

It catalyzes the reaction that produces glyceraldehyde3-phosphate (G3P).

It catalyzes the reaction that regenerates RuBP.

It catalyzes the reaction utilizing ATP and NADPH.

What are the roles of ATP and NADPH in photosynthesis?

ATP and NADPH are forms of chemical energy produced from the light dependent reactions to be used in the light independent reactions that produce sugars.

ATP and NADPH are forms of chemical energy produced from the light independent reactions, to be used in the light dependent reactions that produce sugars.

ATP and NADPH are forms of chemical energy produced from the light dependent reactions to be used in the light independent reactions that produce proteins.

ATP and NADPH are forms of chemical energy produced from the light dependent reactions to be used in the light independent reactions that use sugars as reactants.

Identify the stages of photosynthesis and the connections between those stages. Applying this knowledge, what is the overall outcome of the light-dependent reactions in photosynthesis?

NADPH and ATP molecules are produced during the light-dependent reactions and are used to power the light-independent reactions.

NADPH and ATP molecules are produced during the light-independent reactions and are used to power the light-dependent reactions.

Sugar and ATP are produced during the light-dependent reactions and are used to power the light-independent reactions.

Carbon dioxide and NADPH are produced during the light-independent reactions and are used to power the light-dependent reactions.

Examine the illustration of the photosynthesis equation. How does the equation relate to both photosynthesis and cellular respiration, and what is the connection between the two processes?

Photosynthesis utilizes energy to build carbohydrates, while cellular respiration metabolizes carbohydrates.

Photosynthesis utilizes energy to metabolize carbohydrates, while cellular respiration builds carbohydrates.

Photosynthesis and cellular respiration both utilize carbon dioxide and water to produce carbohydrates.

Photosynthesis and cellular respiration both metabolize carbohydrates to produce carbon dioxide and water.

How is the energy from the sun transported within chloroplasts? Support your answer with details of the processes involved.

When photons strike photosystem (PS) II, pigments pass the light energy to chlorophyll a molecules that excite electrons, which are then passed to the electron transport chain. The cytochrome complex transfers protons across the thylakoid membrane and transfers electrons from PS-II to PS-I. The products of the light-dependent reaction are used to power the Calvin cycle to produce glucose.

When photons strike photosystem (PS) I, pigments pass the light energy to chlorophyll, molecules that excite electrons, which are then passed to the electron transport chain. The cytochrome complex then transfers protons across the thylakoid membrane and transfers electrons from PS-II to PS-I. The products of the light-dependent reaction are used to power the Calvin cycle to produce glucose.

When photons strike photosystem (PS) II, pigments pass the light energy to chlorophyll a molecules that in turn excite electrons, which are then passed to the electron transport chain. The cytochrome complex transfers protons across the thylakoid membrane and transfers electrons from PS-I to PS-II. The products of the light-dependent reaction are used to power the Calvin cycle to produce glucose.

When photons strike photosystem (PS) II, pigments pass the light energy to chlorophyll a molecules that excite electrons, which are then passed to the electron transport chain. The cytochrome complex transfers protons across the thylakoid membrane and transfers electrons from PS II to PS I. The products of the light-independent reaction are used to power the Calvin cycle to produce glucose.

If a plant were to be exposed to only red light, would photosynthesis be possible?

Photosynthesis is not possible.

Photosynthesis is possible only with blue light.

Photosynthesis is possible only with green light.

Applying your understanding of how processes of photosynthesis are connected, select the best description of the electron transfer pathway from photosynthesis II to photosynthesis I in the light-dependent reactions.

After splitting water in PS-II, high-energy electrons are delivered through the chloroplast electron transport chain to PS-I.

After splitting water in PS-I, high-energy electrons are delivered through the chloroplast electron transport chain to PS-II.

After the photosynthesis reaction, released products like glucose help in the transfer of electrons from PS-II to PS-I.

After the completion of the light-dependent reactions, the electrons are transferred from PS-II to PS-I.

Based on your understanding of the process of photosynthesis, predict what will happen to a plant leaf that loses CO 2 too quickly.

Photosynthesis in the leaf will slow down or possibly stop.

This event will have no effect on the rate of photosynthesis in the leaf.

Photosynthesis in the leaf will increase exponentially.

Photosynthesis in the leaf will first decrease and then increase.

What are the products of the Calvin cycle and what is regenerated?

The product of the Calvin cycle is glyceraldehyde-3 phosphate and RuBP is regenerated.

The product of the Calvin cycle is glyceraldehyde-3 phosphate and RuBisCO is regenerated.

The product of the Calvin cycle is a 3-PGA molecule and glyceraldehyde-3 phosphate is regenerated.

The product of the Calvin cycle is glyceraldehyde-3 phosphate and oxygen is regenerated.

An inadequate supply of water can compromise plants' aibility to carry out photosynthesis. How do desert plants prevent such water loss when they are subjected to high heat?

by using CAM photosynthesis and by opening stomatal pores during the night

by using CAM photosynthesis and by closing stomatal pores during the night

by using CAM photosynthesis and by keeping stomatal pores closed at all times

by bypassing CAM photosynthesis and by keeping stomatal pores closed at night

Carnivores, such as lions, are dependent on photosynthesis to survive. Considering the organisms and processes involved in carrying out photosynthesis, provide the reasoning to explain why this is the case.

The prey of lions are generally herbivores, which depend on autotrophs.

The prey of lions are generally herbivores, which depend on heterotrophs.

The prey of lions are generally smaller carnivorous animals, which depend on non-photosynthetic organisms.

The prey of lions are generally autotrophs, which depend on other autotrophs.

Interpret the reactions of the Calvin cycle as pictured. Why does it take three turns of the Calvin cycle to produce G3P, the initial product of photosynthesis?

It takes three turns to fix enough carbon to export one G3P molecule.

It takes three turns to fix enough oxygen to export one G3P molecule.

It takes three turns to produce RuBisCO as an end product.

It takes three turns to produce ATP and NADPH for fixation of G3P.

Evaluate the concept that there is a common ancestry for all organisms. What evidence exists that the evolution of photosynthesis and cellular respiration support this concept?

All organisms perform cellular respiration using oxygen and glucose, which are produced by photosynthesis.

All organisms perform cellular respiration using carbon dioxide and glucose, which are produced by photosynthesis.

All organisms perform cellular respiration using oxygen and lipids, which are produced by photosynthesis.

All organisms perform cellular respiration using carbon dioxide and lipids, which are produced by photosynthesis.

Correctly label the indicated parts of a chloroplast.

A. outer membrane, B. stroma, C. granum, D. thylakoid, E. inner membrane

A. stroma, B. outer membrane, C. granum, D. thylakoid, E. inner membrane

A. outer membrane, B. stroma, C. granum, D. inner membrane, E. thylakoid

A. stroma, B. outer membrane, C. inner membrane, D. granum, E. thylakoid

Compare and contrast the structures and mechanisms involved in both photosynthesis and cellular respiration. What cellular features and reactions are similar in both processes?

Both processes are contained in organelles with double membranes, and both use a version of the cytochrome complex.

Both processes are contained in organelles with single membranes, and both use a version of the cytochrome complex.

Both processes are contained in organelles with double membranes, and neither uses a version of the cytochrome complex.

Both processes are contained in organelles with single membranes, and neither uses a version of the cytochrome complex.

Photosynthesis Quiz

34 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following components is not used by both plants and cyanobacteria to carry out photosynthesis?

carbon dioxide

chlorophyll

chloroplasts

water

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why are chemoautotrophs not considered the same as photoautotrophs if they both extract energy and make sugars?

Chemoautotrophs use wavelengths of light not available to photoautotrophs

Chemoautotrophs extract energy from inorganic chemical compounds

Photoautotrophs prefer the blue side of the visible light spectrum.

Photoautotrophs make glucose, while chemoautotrophs make galactose

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In which compartment of the plant cell do the light-independent reactions of photosynthesis take place?

mesophyll

outer membrane

stroma

thylakoid

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a part of grana?

the Calvin cycle

the inner membrane

stroma

thylakoids

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are two major products of photosynthesis?

chlorophyll and oxygen

oxygen and carbon dioxide

sugars/carbohydrates and oxygen

sugars/carbohydrates and carbon dioxide

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary energy source for cells?

glucose

starch

sucrose

triglycerides

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which portion of the electromagnetic radiation originating from the sun is harmful to living tissues?

blue

green

infrared

ultraviolet

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Photosynthesis

Which of the following components is not used by both plants and cyanobacteria to carry out photosynthesis?

Why are chemoautotrophs not considered the same as photoautotrophs if they both extract energy and make sugars?

In which compartment of the plant cell do the light-independent reactions of photosynthesis take place?

What is a part of grana?

What are two major products of photosynthesis?

What is the primary energy source for cells?

Which portion of the electromagnetic radiation originating from the sun is harmful to living tissues?

The amount of energy in a wave can be measured using what trait?

What portion of the electromagnetic radiation emitted by the sun has the least energy?

What is the function of carotenoids in photosynthesis?

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