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

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2O + \text{light energy} \rightarrow C_6H_{12}O_6$ + 6\ \mathrm{O}_2$$

Question 1

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

Accepted Answer

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2O + 	ext{light energy} ightarrow C_6H_{12}O_6$ + 6\ \mathrm{O}_2$$

Question 2

Which molecule is regenerated during the regeneration phase of the Calvin cycle, allowing the cycle to continue?

Accepted Answer

Ribulose-1,5-bisphosphate (RuBP)

Question 3

Why are photosynthesis and cellular respiration considered complementary processes in the carbon cycle?

Accepted Answer

Photosynthesis removes $$\mathrm{CO}_2$$ from the atmosphere and produces $$\mathrm{O}_2$$, while cellular respiration uses $$\mathrm{O}_2$$ and releases $$\mathrm{CO}_2.$$

Question 4

Which of the following is an input for the light-dependent reactions of photosynthesis?

Accepted Answer

Water ($$\mathrm{H}_2O)$$

Question 5

A scientist measures the change in $$\mathrm{CO}_2$$ concentration in a sealed chamber containing a plant under different light intensities. What does a negative change in $$\mathrm{CO}_2$$ indicate?

Accepted Answer

The plant is performing more photosynthesis than cellular respiration.

Question 6

Where in the cell does the Calvin cycle take place?

Accepted Answer

Stroma of the chloroplast

Question 7

Which variable would be considered the independent variable in an experiment testing the effect of light intensity on the rate of photosynthesis?

Accepted Answer

Light intensity

Question 8

Which of the following best explains why error bars are included on a bar graph of experimental results?

Accepted Answer

They represent the variability or standard deviation of the data.

Question 9

At low light levels, what is the relationship between the rates of photosynthesis and cellular respiration in plants?

Accepted Answer

Cellular respiration may exceed photosynthesis, resulting in a net release of $$\mathrm{CO}_2.$$

Question 10

Which of the following is a direct output of the light-independent reactions (Calvin cycle) of photosynthesis?

Accepted Answer

G3P (glyceraldehyde-3-phosphate)

Question 11

A student wants to grow plants indoors. Which variable should be controlled to ensure successful plant growth?

Accepted Answer

Light intensity

Question 12

Which of the following best describes the relationship between the light-dependent and light-independent reactions of photosynthesis?

Accepted Answer

The light-dependent reactions produce ATP and NADPH, which are used in the light-independent reactions.

Question 13

Which of the following is the correct sequence of events for the movement of carbon through the carbon cycle in a terrestrial ecosystem?

Accepted Answer

Atmospheric $$\mathrm{CO}_2$$ → Plant (photosynthesis) → Animal (consumption) → Atmospheric $$\mathrm{CO}_2 ($$respiration)

Question 14

Which of the following statements is TRUE regarding the effect of increasing light levels on the rate of photosynthesis?

Accepted Answer

The rate of photosynthesis increases with higher light levels, up to a certain point.

Question 15

Which of the following is an input for cellular respiration?

Accepted Answer

Glucose

Question 16

Which organelle is responsible for cellular respiration in plant and animal cells?

Accepted Answer

Mitochondrion

Question 17

A researcher is analyzing a scatter plot with a regression line showing the relationship between light intensity and rate of photosynthesis. What does the slope of the regression line represent?

Accepted Answer

The rate at which photosynthesis changes with increasing light intensity.

Question 18

Which of the following best explains why plants can perform both photosynthesis and cellular respiration?

Accepted Answer

Plants have both chloroplasts for photosynthesis and mitochondria for cellular respiration.

Question 19

If two data sets on a bar graph have error bars that do not overlap, what can you conclude?

Accepted Answer

There is likely a statistically significant difference between the two data sets.

Question 20

Which of the following is the source of carbon for the glucose produced during photosynthesis?

Accepted Answer

Atmospheric $$\mathrm{CO}_2$$

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