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

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

Question 1

Which of the following best describes the relationship between photosynthesis and cellular respiration in the ecosystem, as shown in the first image?

Accepted Answer

Photosynthesis converts light energy into chemical energy, which is then used by cellular respiration to produce ATP, releasing heat energy as a byproduct.

Question 2

Based on the second image, which type of autotroph is most likely to be found near deep-sea hydrothermal vents?

Accepted Answer

Chemoautotrophs that oxidize inorganic substances such as hydrogen sulfide (H2S) to make organic compounds from CO2.

Question 3

Which organisms in the third image are capable of oxygenic photosynthesis?

Accepted Answer

Plants, multicellular algae, unicellular eukaryotes, and cyanobacteria.

Question 4

What is the main function of stomata in the leaf cross-section shown in the fifth image?

Accepted Answer

To allow for gas exchange, enabling CO2 to enter and O2 to exit the leaf.

Question 5

In the chloroplast structure shown in the sixth image, where do the light reactions of photosynthesis take place?

Accepted Answer

In the thylakoid membranes.

Question 6

The porphyrin ring structure in chlorophyll, as shown in the seventh image, contains a central atom that is essential for its function. What is this atom?

Accepted Answer

Magnesium (Mg)

Question 7

Which of the following best explains why chlorophyll appears green to our eyes, as illustrated in the image showing light absorption and reflection by a chloroplast?

Accepted Answer

Chlorophyll reflects and transmits green light while absorbing other wavelengths.

Question 8

According to the electromagnetic spectrum shown, which type of light has the highest energy and shortest wavelength?

Accepted Answer

Gamma rays

Question 9

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

Accepted Answer

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

Question 10

In the diagram showing the light reactions and Calvin cycle, what is the primary role of NADPH?

Accepted Answer

To provide reducing power (electrons) for the synthesis of sugars in the Calvin cycle.

Question 11

Which pigment is primarily responsible for absorbing violet-blue and red light, and is found in the reaction centers of both photosystem I and II?

Accepted Answer

Chlorophyll a

Question 12

What is the main adaptive advantage of C4 and CAM photosynthetic pathways in plants?

Accepted Answer

They minimize photorespiration and conserve water in hot, dry environments.

Question 13

During the light reactions of photosynthesis, what is the immediate source of electrons for the electron transport chain in photosystem II?

Accepted Answer

Water ($$H_2O)$$

Question 14

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

Accepted Answer

It uses ATP and NADPH to convert CO2 into G3P (glyceraldehyde-3-phosphate).

Question 15

Which pigment group is responsible for the yellow, orange, and red colors seen in many fruits and vegetables, especially in autumn?

Accepted Answer

Carotenoids

Question 16

What is the main reason why anthocyanin pigments are not involved in the light reactions of photosynthesis?

Accepted Answer

They are located in the central vacuole and do not transfer photons to chlorophyll a.

Question 17

Which of the following best describes the process of chemiosmosis in chloroplasts?

Accepted Answer

Protons are pumped into the thylakoid space, creating a gradient that drives ATP synthesis as protons flow back into the stroma through ATP synthase.

Question 18

Which of the following is a correct description of photorespiration?

Accepted Answer

Rubisco adds O2 instead of CO2 to RuBP, consuming O2 and ATP without producing sugar.

Question 19

Which of the following is a key difference between C4 and CAM plants?

Accepted Answer

C4 plants separate carbon fixation and the Calvin cycle spatially, while CAM plants separate them temporally.

Photosynthesis: The Process That Feeds the Biosphere

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