Q: What is the correct summary equation for photosynthesis?

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + \text{light energy} \rightarrow C_6H_{12}O_6$ + 6\ \mathrm{O}_2$$

Question 1

Which of the following best describes the overall process of photosynthesis in plants?

Accepted Answer

Conversion of light energy into chemical energy, producing glucose and oxygen.

Question 2

What is the correct summary equation for photosynthesis?

Accepted Answer

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + 	ext{light energy} ightarrow C_6H_{12}O_6$ + 6\ \mathrm{O}_2$$

Question 3

During photosynthesis, which reactant is reduced and which is oxidized?

Accepted Answer

Carbon dioxide is reduced; water is oxidized.

Question 4

Which of the following statements about the energy changes in photosynthesis and cellular respiration is correct?

Accepted Answer

Photosynthesis is endergonic and cellular respiration is exergonic.

Question 5

Which part of the chloroplast is the site of the Calvin cycle?

Accepted Answer

Stroma

Question 6

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

Accepted Answer

The rate will decrease because green light is mostly reflected, not absorbed.

Question 7

Which of the following best describes the flow of electrons during the light reactions of photosynthesis?

Accepted Answer

From water to NADP$$^+$$ via Photosystem II and Photosystem I

Question 8

Which enzyme is responsible for carbon fixation in the Calvin cycle, and what is its function?

Accepted Answer

Rubisco; incorporates CO$$_2$$ into organic molecules

Question 9

Which of the following is a key difference between photophosphorylation in photosynthesis and oxidative phosphorylation in cellular respiration?

Accepted Answer

Photophosphorylation uses light energy to drive ATP synthesis, while oxidative phosphorylation uses energy from electron transfer from food molecules.

Question 10

A scientist tracks a single carbon atom as it moves through the carbon cycle, starting as CO$$_2 in $$the atmosphere. Which sequence correctly describes its possible path?

Accepted Answer

Atmospheric CO$$_2$$ → photosynthesis in a plant → organic molecule in plant → cellular respiration in animal → atmospheric CO$$_2$$

Question 11

Which process in the carbon cycle acts to moderate the greenhouse effect?

Accepted Answer

Photosynthesis

Question 12

Which of the following human activities has accelerated the loss of biodiversity and increased atmospheric CO$$_2$$ levels?

Accepted Answer

Fossil fuel burning

Question 13

Which of the following is a consequence of global climate change on the biosphere?

Accepted Answer

Loss of habitats and species extinction

Question 14

Which of the following actions would most effectively mitigate human-caused climate change?

Accepted Answer

Reducing deforestation and increasing renewable energy use

Question 15

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

Accepted Answer

Photosynthesis stores energy in glucose, while cellular respiration releases energy from glucose.

Question 16

Which products of the light reactions are used in the Calvin cycle?

Accepted Answer

ATP and NADPH

Question 17

A plant cell is placed in an environment with limited CO$$_2. $$Which process will be directly affected first?

Accepted Answer

Calvin cycle

Question 18

Which of the following best explains why plants carry out both photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis provides glucose for cellular respiration, which supplies ATP for cellular activities.

Question 19

Which of the following is a correct comparison between the thylakoid and the stroma in a chloroplast?

Accepted Answer

The thylakoid is where light reactions occur, while the stroma is where the Calvin cycle occurs.

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