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

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

Question 1

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

Accepted Answer

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

Question 2

Which structure within the chloroplast is primarily responsible for the light-dependent reactions of photosynthesis?

Accepted Answer

Thylakoid membrane

Question 3

What is the main role of the pigment chlorophyll a in photosynthesis?

Accepted Answer

To reflect green light and absorb blue and red light for energy conversion

Question 4

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

Accepted Answer

Autotrophs produce organic molecules from inorganic molecules using energy from sunlight or chemicals

Question 5

During the light reactions of photosynthesis, what is the fate of the electrons extracted from water?

Accepted Answer

They are transferred to NADP+ to form NADPH

Question 6

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

Accepted Answer

Chlorophyll reflects green light and absorbs blue and red light

Question 7

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

Accepted Answer

To use ATP and NADPH to reduce CO$$_2$$ into sugars

Question 8

Which enzyme is responsible for the fixation of carbon dioxide in the Calvin cycle?

Accepted Answer

Rubisco

Question 9

Why is photorespiration considered a limitation to photosynthesis in C3 plants?

Accepted Answer

It allows oxygen to compete with CO$$_2$$ for Rubisco, reducing sugar production

Question 10

Which of the following is a correct comparison between cyclic and linear electron flow in photosynthesis?

Accepted Answer

Cyclic electron flow produces ATP but not NADPH or O$$_2$$, while linear electron flow produces ATP, NADPH, and O$$_2$$

Question 11

A scientist discovers a new organism that uses hydrogen sulfide (H$$_2S) $$instead of water in its photosynthetic process. What is the most likely byproduct of this organism's photosynthesis?

Accepted Answer

Sulfur (S)

Question 12

Which of the following best describes the role of ATP synthase in the light reactions of photosynthesis?

Accepted Answer

It synthesizes ATP as protons flow down their electrochemical gradient from the thylakoid lumen to the stroma

Question 13

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

Accepted Answer

Glucose

Question 14

Which of the following historical experiments provided evidence that plants produce oxygen only in the presence of sunlight?

Accepted Answer

Jan Ingenhousz's experiment with aquatic plants and sunlight

Question 15

Which of the following best explains why fossil fuels are considered a product of ancient photosynthesis?

Accepted Answer

They are formed from the remains of ancient photosynthetic organisms that stored solar energy as chemical energy

Question 16

Which of the following is a real-world application of photosynthesis being explored for sustainable energy production?

Accepted Answer

Using algae to produce biofuels

Question 17

A plant leaf is covered with a strip labeled 'LIGHT' and exposed to sunlight, then tested with iodine. The area under the strip does not turn blue-black. What does this experiment demonstrate?

Accepted Answer

Starch is produced only in areas exposed to light

Question 18

Which of the following is a correct statement about the relationship between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis is an anabolic, endergonic process, while cellular respiration is catabolic and exergonic

Question 19

Which of the following organisms is NOT capable of photosynthesis?

Accepted Answer

Fungi

Question 20

What is the main reason why plants store excess glucose as starch?

Accepted Answer

Starch is insoluble and can be stored without affecting the cell's osmotic balance

Photosynthesis: The Process that Feeds the Biosphere

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