Q: Which of the following best represents the overall summary equation for photosynthesis in plants?

$$6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + \text{light energy} \rightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2$$

Question 1

Which of the following best represents the overall summary equation for photosynthesis in plants?

Accepted Answer

$$6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + 	ext{light energy} ightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2$$

Question 2

Which structure within a plant leaf is primarily responsible for gas exchange during photosynthesis?

Accepted Answer

Stomata

Question 3

What is the main function of the light reactions in photosynthesis?

Accepted Answer

To convert light energy into chemical energy in the form of ATP and NADPH

Question 4

Which of the following is NOT a product of the light reactions of photosynthesis?

Accepted Answer

Glucose

Question 5

During the Calvin cycle, which enzyme is responsible for attaching carbon dioxide to RuBP in the first step?

Accepted Answer

Rubisco

Question 6

A plant is exposed to only green light. Which pigment is LEAST likely to absorb this light, and what is the likely effect on photosynthesis?

Accepted Answer

Chlorophyll b; photosynthesis will decrease because green light is mostly reflected

Question 7

Which of the following best describes the role of carotenoids in photosynthesis?

Accepted Answer

They provide photoprotection by absorbing and dissipating excess light energy

Question 8

In the light reactions, what is the immediate source of electrons for the electron transport chain in photosystem II?

Accepted Answer

Water ($$\mathrm{H}_2\mathrm{O})$$

Question 9

Which of the following statements about the Calvin cycle is correct?

Accepted Answer

It uses ATP and NADPH produced in the light reactions to fix carbon dioxide into sugars

Question 10

A scientist is studying a plant that keeps its stomata closed during the day and opens them at night to fix carbon dioxide. Which type of plant is this, and what is the main advantage of this adaptation?

Accepted Answer

CAM plant; it reduces water loss in arid environments

Question 11

Which of the following best explains why C4 plants are more efficient than C3 plants in hot, dry climates?

Accepted Answer

C4 plants minimize photorespiration by fixing CO2 into a 4-carbon compound and keeping stomata closed during the day

Question 12

Which of the following is a correct sequence of events in the light reactions of photosynthesis?

Accepted Answer

Light absorption by photosystem II $$\rightarrow$$ electron transport chain $$\rightarrow$$ ATP and NADPH production

Question 13

If a plant's thylakoid membranes were damaged, which process would be directly affected?

Accepted Answer

The light reactions, including ATP and NADPH production

Question 14

Which of the following is a real-world consequence of the greenhouse effect as it relates to photosynthesis?

Accepted Answer

Increased atmospheric $$\mathrm{CO}_2$$ can enhance photosynthesis but also contributes to global climate change

Question 15

A mutation causes a plant to lack the enzyme rubisco. Which step of photosynthesis would be directly impaired?

Accepted Answer

Carbon fixation in the Calvin cycle

Question 16

Which of the following best describes the relationship between the light reactions and the Calvin cycle?

Accepted Answer

The light reactions provide ATP and NADPH to power the Calvin cycle

Question 17

In a scenario where a plant is exposed to high oxygen and low carbon dioxide concentrations, which process is likely to increase, and what is its consequence?

Accepted Answer

Photorespiration; it consumes ATP and reduces sugar production

Question 18

Which of the following is a correct description of an autotroph?

Accepted Answer

An organism that produces its own food from inorganic substances using light or chemical energy

Question 19

During the Calvin cycle, how many turns are required to produce one molecule of G3P, and what is the significance of G3P?

Accepted Answer

Three turns; G3P is a 3-carbon sugar that can be used to form glucose and other organic molecules

Question 20

Which of the following best explains why photoautotrophs are considered producers in ecosystems?

Accepted Answer

They convert inorganic carbon (CO2) into organic molecules using light energy, forming the base of food chains

Chapter 7: Photosynthesis – Using Light to Make Food (BIOL 151 Study Notes)

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