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

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

Question 1

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

Accepted Answer

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

Question 2

Which structure within the chloroplast is the primary site of the light reactions of photosynthesis?

Accepted Answer

Thylakoid membrane

Question 3

During the light reactions, what is the fate of the electrons released from the splitting of water?

Accepted Answer

They are used to reduce NADP$$^+ to $$NADPH

Question 4

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

Accepted Answer

Chlorophyll reflects green light and absorbs other wavelengths

Question 5

Which of the following is a correct description of the Calvin cycle?

Accepted Answer

It uses ATP and NADPH to convert CO$$_2$$ into carbohydrates

Question 6

Which of the following organisms is NOT capable of photosynthesis?

Accepted Answer

Fungi

Question 7

What is the main role of NADPH in photosynthesis?

Accepted Answer

It donates electrons for the reduction of carbon dioxide in the Calvin cycle

Question 8

Which of the following best describes the relationship between wavelength and energy of photons used in photosynthesis?

Accepted Answer

Shorter wavelength photons have higher energy

Question 9

Which color of visible light is LEAST effective for driving photosynthesis in plants?

Accepted Answer

Green

Question 10

In the context of redox reactions during photosynthesis, which molecule is oxidized and which is reduced?

Accepted Answer

Water is oxidized, carbon dioxide is reduced

Question 11

Which of the following statements about autotrophs and heterotrophs is correct?

Accepted Answer

Autotrophs can produce their own organic molecules from inorganic sources

Question 12

Which process in photosynthesis is directly responsible for the release of oxygen gas?

Accepted Answer

Splitting of water during the light reactions

Question 13

A plant is exposed only to green light. What is the most likely effect on its rate of photosynthesis?

Accepted Answer

The rate of photosynthesis will decrease significantly

Question 14

Which of the following best explains why oxygen is considered a byproduct of the light reactions?

Accepted Answer

Oxygen is released when water is split to provide electrons for the electron transport chain

Question 15

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

Accepted Answer

Absorption of light by chlorophyll, excitation of electrons, transfer to electron acceptor

Question 16

Which of the following best describes the function of carotenoids in plant cells?

Accepted Answer

They act as accessory pigments, broadening the spectrum of light that can be used for photosynthesis

Question 17

A scientist uses a spectrophotometer to analyze a pigment solution. If the solution absorbs most blue light but transmits green light, what can be inferred about the pigment?

Accepted Answer

The pigment absorbs blue light and reflects/transmits green light

Question 18

Which of the following is a real-world application of understanding the action spectrum of photosynthesis?

Accepted Answer

Designing artificial lighting for optimal plant growth in greenhouses

Question 19

Which of the following statements about the electromagnetic spectrum and photosynthesis is correct?

Accepted Answer

Photosynthesis primarily uses visible light, especially wavelengths in the violet-blue and red regions

Question 20

Which of the following best explains the difference between substrate-level phosphorylation and oxidative phosphorylation in cellular respiration?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group to ADP, while oxidative phosphorylation uses a proton gradient and ATP synthase

Photosynthesis: Mechanisms, Organisms, and Light Reactions Part 1

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