Q: Which of the following best represents the overall chemical equation for photosynthesis?

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2O + \text{light energy} \rightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2$$

Question 1

Which of the following best represents the overall chemical equation for photosynthesis?

Accepted Answer

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2O + 	ext{light energy} ightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2$$

Question 2

In the process of photosynthesis, which reactant is reduced?

Accepted Answer

Carbon dioxide ($$\mathrm{CO}_2)$$

Question 3

Which structure in the leaf is primarily responsible for gas exchange with the atmosphere?

Accepted Answer

Stomata

Question 4

What is the main product of the Calvin cycle?

Accepted Answer

Glucose ($$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6)$$

Question 5

Which of the following pigments does NOT absorb yellow/orange light (650-750 nm)?

Accepted Answer

Both a & c

Question 6

Why is the action spectrum for photosynthesis broader than the absorption spectrum for chlorophyll a?

Accepted Answer

Accessory pigments absorb light in addition to chlorophyll a, which can be used in photosynthesis.

Question 7

Where do the electrons that are excited in photosystem II come from?

Accepted Answer

Water ($$\mathrm{H}_2O)$$

Question 8

Which of the following best describes the function of the light reactions in photosynthesis?

Accepted Answer

Production of ATP and NADPH.

Question 9

Which of the following processes occurs during the Calvin cycle?

Accepted Answer

Regeneration of RuBP.

Question 10

A plant that opens its stomata only at night is classified as a:

Accepted Answer

CAM plant

Question 11

Which of the following is a key difference between aerobic cellular respiration and the light reactions of photosynthesis?

Accepted Answer

Aerobic cellular respiration consumes reduced electron carriers (ex: NADH) to make ATP, but the light reactions synthesize reduced electron carriers (ex: NADPH) while also synthesizing ATP.

Question 12

What is the correct order of steps in the light reactions of photosynthesis?

Accepted Answer

Photosystem II, ETC, Photosystem I, NADP+ reduction, chemiosmosis.

Question 13

Which of the following best explains why CAM plants can keep their stomata closed during the day?

Accepted Answer

They fix CO2 into organic 4-carbon compounds during the night.

Question 14

Which of the following is NOT a similarity between the light reactions in photosynthesis and the electron transport chain/chemiosmosis in cellular respiration?

Accepted Answer

Both have the goal of creating energy storing molecules such as ATP.

Question 15

During the Calvin cycle, the enzyme rubisco combines RuBP with a carbon atom from:

Accepted Answer

Carbon dioxide ($$\mathrm{CO}_2)$$

Question 16

Which component of the electromagnetic spectrum allows our eyes to visualize color?

Accepted Answer

Visible light

Question 17

Which of the following best describes the relationship between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis produces the reactants needed for cellular respiration, and vice versa.

Question 18

What is the primary function of accessory pigments in photosynthesis?

Accepted Answer

To absorb additional wavelengths of light that chlorophyll a cannot.

Question 19

Which of the following best describes the energy transformation that occurs during the light reactions of photosynthesis?

Accepted Answer

Light energy is converted to chemical energy in the form of ATP and NADPH.

Photosynthesis: Mechanisms, Pigments, and Plant Adaptations

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