Question 1

Where does the majority of the mass in a large oak tree originate as it grows from a small acorn?

Accepted Answer

Gases taken from the air, primarily $$CO_2$$

Question 2

Which of the following best describes the chemical reaction of photosynthesis: $$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$?

Accepted Answer

The reaction is endergonic and the carbon in $$CO_2 is $$reduced when $$C_6H_{12}O_6$ is formed

Question 3

What is the primary source of energy that drives the reduction of carbon during photosynthesis?

Accepted Answer

Solar energy absorbed by chlorophyll

Question 4

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

Accepted Answer

Thylakoid membrane

Question 5

During the light reactions of photosynthesis, electrons flow from water to NADP$$^+. $$What is the correct sequence of this electron flow?

Accepted Answer

Water $$\rightarrow$$ Photosystem II $$\rightarrow$$ Electron Transport Chain $$\rightarrow$$ Photosystem I $$\rightarrow$$ NADP$$^+$$

Question 6

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

Accepted Answer

It is a series of reactions that fix carbon and do not directly require light

Question 7

Why is photosynthesis considered a carbon-reduction process?

Accepted Answer

Because carbon atoms gain electrons and are converted from $$CO_2 to$$ $$C_6H_{12}O_6$

Question 8

Which of the following is a similarity between the electron transport chains in photosynthesis and aerobic respiration?

Accepted Answer

Both generate ATP via chemiosmosis

Question 9

What is the main function of the excess sugars produced by plants during photosynthesis?

Accepted Answer

They provide food energy for other organisms in the ecosystem

Question 10

Which of the following best explains why photorespiration occurs in plants?

Accepted Answer

Because Rubisco can bind to oxygen instead of carbon dioxide under certain conditions

Question 11

Which part of the chloroplast contains the enzymes necessary for the Calvin Cycle?

Accepted Answer

Stroma

Question 12

If a plant is exposed to sunlight but deprived of $$CO_2$$, which process will be directly affected first?

Accepted Answer

Calvin Cycle (carbon fixation)

Question 13

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

Accepted Answer

Glucose ($$C_6H_{12}O_6$)

Question 14

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

Accepted Answer

It is reduced to NADPH, which carries electrons to the Calvin Cycle

Question 15

Which of the following equations correctly represents the overall process of photosynthesis?

Accepted Answer

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

Question 16

Which of the following best describes the Z-scheme in photosynthesis?

Accepted Answer

The flow of electrons from water through photosystem II and I to NADP$$^+$$

Question 17

Which of the following is a difference between the electron transport chains in photosynthesis and aerobic respiration?

Accepted Answer

Photosynthesis uses water as an electron donor, while respiration uses NADH

Question 18

A scientist measures the ratio of oxygen to carbon in a sample of $$CO_2$$ and in a sample of $$C_6H_{12}O_6$. What does a lower O:C ratio in C_6H$$_{12}$$O_6$$ indicate about the carbon atoms?

Accepted Answer

Carbon is more reduced in $$C_6H_{12}O_6$

Question 19

Which of the following is a real-world consequence of the excess sugar production by plants?

Accepted Answer

It supports the food web by providing energy to herbivores and higher trophic levels

Introduction to Photosynthesis: Energy, Electron Flow, and Plant Metabolism

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