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

$$6CO_2 + 12H_2O + \text{Light energy} \rightarrow C_6H_{12}O_6$ + 6O_2 + 6H_2O$$

Question 1

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

Accepted Answer

$$6CO_2 + 12H_2O + 	ext{Light energy} ightarrow C_6H_{12}O_6$ + 6O_2 + 6H_2O$$

Question 2

During the light reactions of photosynthesis, which molecule is split to provide electrons and protons?

Accepted Answer

$$H_2O$$

Question 3

What is the primary function of the Calvin cycle in photosynthesis?

Accepted Answer

To fix carbon dioxide and produce sugar

Question 4

Which pigment is the main light-capturing molecule in chloroplasts?

Accepted Answer

Chlorophyll a

Question 5

What is the role of NADP$$^+ in $$the light reactions of photosynthesis?

Accepted Answer

It is reduced to NADPH, storing high-energy electrons

Question 6

Which of the following statements about the direction of electron flow in photosynthesis compared to cellular respiration is correct?

Accepted Answer

Photosynthesis reverses the direction of electron flow compared to respiration

Question 7

In the process of chemiosmosis during the light reactions, what drives the synthesis of ATP?

Accepted Answer

The movement of protons ($$H^+) $$down their concentration gradient through ATP synthase

Question 8

Which of the following best explains why plants appear green to our eyes?

Accepted Answer

Chlorophyll reflects green light and absorbs red and blue light

Question 9

What is the main purpose of the light-harvesting complex in a photosystem?

Accepted Answer

To transfer the energy of photons to the reaction-center chlorophyll a molecules

Question 10

Which photosystem is responsible for the initial step of linear electron flow in the light reactions, and what is its special pair of chlorophyll a molecules called?

Accepted Answer

Photosystem II; P680

Question 11

During the Calvin cycle, what is the first step that incorporates inorganic carbon into an organic molecule?

Accepted Answer

Carbon fixation

Question 12

Which of the following is a correct comparison between chemiosmosis in chloroplasts and mitochondria?

Accepted Answer

Both use a proton gradient to drive ATP synthesis

Question 13

A plant is exposed only to green light. Which of the following is most likely to occur?

Accepted Answer

The rate of photosynthesis will decrease

Question 14

Which of the following best describes the fate of oxygen produced during the light reactions of photosynthesis?

Accepted Answer

It is released as a by-product into the atmosphere

Question 15

If a mutation prevented the formation of ATP during the light reactions, which process in the Calvin cycle would be directly affected?

Accepted Answer

Reduction of 3-phosphoglycerate to G3P

Question 16

Which of the following statements about the redox reactions in photosynthesis is correct?

Accepted Answer

$$H_2O is $$oxidized and $$CO_2 is $$reduced

Question 17

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

Accepted Answer

Glucose ($$C_6H_{12}O_6$)

Question 18

A scientist exposes a plant to light with a wavelength of 700 nm. Which photosystem will be most directly activated?

Accepted Answer

Photosystem I (P700)

Question 19

Which of the following best explains why the Calvin cycle is considered anabolic?

Accepted Answer

It builds sugar molecules from smaller molecules using ATP and NADPH

Question 20

Which of the following is a real-world consequence if all autotrophs on Earth stopped performing photosynthesis?

Accepted Answer

Oxygen production would cease, threatening aerobic life

Photosynthesis: Converting Solar Energy to Chemical Energy (Chapter 10 Study Notes)

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