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'Phun' with Photosynthesis Trivia Quiz

This quiz is based on the material I learned from my freshman Biology Honors class. Special thanks to my teacher, Mr W (for teaching me). Good luck!

A multiple-choice quiz by joannlee. Estimated time: 4 mins.

Author
joannlee

Time
4 mins

Type
Multiple Choice

Quiz #
251,738

Updated
Jul 23 22

# Qns
10

Difficulty
Tough

Avg Score
5 / 10

Plays
1571

Awards
Top 35% Quiz

Last 3 plays: PHILVV (10/10), Quizaddict1 (2/10), bakeryfarm (6/10).

One at a Time - Single Page - Timed Game

Question 1 of 10

1. What is the balanced equation for photosynthesis? Hint

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

3CO2+ 9ATP+ 6NADPH ---> PGAL +9ADP +6NADP

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

PGAL +9ADP +6NADP --->3CO2+ 9ATP+ 6NADPH

NEXT>

Question 2 of 10

2. In the light reactions, which comes first: photosystem 1, or photosystem 2? Hint

Neither: these aren't in the light reactions.

Photosystem 1

Photosystem 2

They occur at the same time.

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Question 3 of 10

3. Where do the light reactions occur? Hint

Petiole

Stroma

Thylakoid membrane

Outer membrane

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Question 4 of 10

4. Where does the Calvin cycle take place? Hint

Thylakoid membrane

Roots

Outer membrane

Stroma

NEXT>

Question 5 of 10

5. In the Calvin cycle, what enzyme aids in carbon fixation? Hint

NADP reductase

PEP carboxylase

Rubisco

ATP synthetase

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Question 6 of 10

6. Some plants have special adaptations to deal with extremely hot, dry conditions. What kind of plants are these? Hint

Both C4 and CAM plants

CAM

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Question 7 of 10

7. What enzyme fixes carbon in C4 and CAM plants? Hint

NADP reductase

ATP synthetase

PEP carboxylase

Rubisco

NEXT>

Question 8 of 10

8. Back to the light reactions: When H+ (hydrogen ions) are pumped into the thylakoid, they build up osmotic pressure, and with the help of *what* are pumped back out of the thylakoid space? Hint

Ion pump

NADP reductase

ATP Synthetase

Proton pump

NEXT>

Question 9 of 10

9. What wavelength of visible light causes the re-excitation of electrons in photosystem 1? Hint

400 nm (violet)

600 nm (yellow)

550 nm (green)

700 nm (red)

NEXT>

Question 10 of 10

10. What colour of visible light is the shortest in wavelength? Hint

Red

Violet

Blue

Green

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Most Recent Scores

Apr 18 2024 : PHILVV: 10/10
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Apr 08 2024 : bakeryfarm: 6/10
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Quiz Answer Key and Fun Facts

1. What is the balanced equation for photosynthesis?

Answer: 6H2O + 6CO2 ---> C6H12O6+ 6O2

Photosynthesis is water + carbon dioxide ---> sugar [used as energy] + oxygen. 6O2 + C6H12O6 ---->6H20 + 6CO2 is cellular respiration (the opposite equation of photosynthesis) and the other two are the forward (3CO2+ 9ATP+ 6NADPH ---> PGAL +9ADP +6NADP) and backward (PGAL +9ADP +6NADP --->3CO2+ 9ATP+ 6NADPH) versions of the Calvin cycle.

2. In the light reactions, which comes first: photosystem 1, or photosystem 2?

Answer: Photosystem 2

Photosystem 2, or P680 (named for the wavelength it absorbs best) is the first photosystem in the light reactions. A photosystem contains an antenna complex of pigment molecules, a reaction-center chlorophyll a and a primary electron acceptor.

3. Where do the light reactions occur?

Answer: Thylakoid membrane

Inside chloroplasts (the organelles responsible for photosynthesis) are disc-shaped structures called thylakoids, and within these is where light reactions take place. A stack of thylakoids is called a granum; multiple stacks are called grana.

4. Where does the Calvin cycle take place?

Answer: Stroma

Named for chemist Melvin Calvin, these reactions are also referred to as light-independent, or dark reactions. The Calvin cycle takes place in the liquid inside the chloroplast. It is fueled by the products of the light reactions.

5. In the Calvin cycle, what enzyme aids in carbon fixation?

Answer: Rubisco

Rubisco stands for 1,5 ribulose bisphosphate carboxylase oxygenase. It fixes carbon into the Calvin cycle, but if there is a lack of CO2, then rubisco can also fix oxygen into the Calvin cycle. This is called photorespiration.

6. Some plants have special adaptations to deal with extremely hot, dry conditions. What kind of plants are these?

Answer: Both C4 and CAM plants

Plants without these adaptations have 3-carbon acids, while C4 plants have 4-carbon acids. This 4-carbon acid replaces C02 in the Calvin cycle. This prevents the enzyme rubisco from 'plugging in' oxygen to the Calvin cycle, and causing photorespiration. Crassulacean acidic metabolism, or CAM, plants are a special kind of C4 plant: they perform the Calvin cycle at night, and C4 plants perform it in the bundle sheath cell, unique to these plants. Sugarcane is a C4 plant, and pineapple is a CAM plant.

7. What enzyme fixes carbon in C4 and CAM plants?

Answer: PEP carboxylase

PEP carboxylase's full name is phosphoenolpyruvate carboxylase. High temperatures have little effect on activity levels of this enzyme, so it makes sense why C4 and CAM plants use it. The whole reason for their adaptation is to survive hot dry weather. Another advantage for C4 and CAM plants is that PEP carboxylase does not have an affinity for oxygen like rubisco does, so the Calvin cycle can always work.

NADP reductase reduces (adds electrons to) the molecule NADP to NADPH.

8. Back to the light reactions: When H+ (hydrogen ions) are pumped into the thylakoid, they build up osmotic pressure, and with the help of *what* are pumped back out of the thylakoid space?

Answer: ATP Synthetase

This "backflow" of H+ from the thylakoid back into the stroma powers ATP production(phosphorylation of ADP), hence the name of the enzyme, ATP synthetase. This enzyme is also referred to as ATP synthetase. The ATP created, along with NADPH, then goes to the Calvin cycle.

9. What wavelength of visible light causes the re-excitation of electrons in photosystem 1?

Answer: 700 nm (red)

Red is one of the more readily absorbed wavelengths for green plants. Green light is virtually useless, because chlorophyll pigments do not absorb green light; they merely reflect it.

10. What colour of visible light is the shortest in wavelength?

Answer: Violet

Violet is about 400 nm and while it is the shortest in wavelength, it is the highest in energy.

Source: Author joannlee

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