Q: Which equation correctly summarizes the overall process of photosynthesis?

$$6 \text{CO}_2 + 6 \text{H}_2\text{O} + \text{Energy} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6 \text{O}_2$$

Question 1

Which of the following statements best explains why leaves appear green to the human eye?

Accepted Answer

Chlorophyll reflects and transmits green light while absorbing violet-blue and red light.

Question 2

Which equation correctly summarizes the overall process of photosynthesis?

Accepted Answer

$$6 	ext{CO}_2 + 6 	ext{H}_2	ext{O} + 	ext{Energy} ightarrow 	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6 	ext{O}_2$$

Question 3

During the light reactions of photosynthesis, what is the primary function of the electron transport chain between Photosystem II and Photosystem I?

Accepted Answer

To generate a proton gradient that drives ATP synthesis via chemiosmosis.

Question 4

Which of the following best describes the role of stomata in plant leaves?

Accepted Answer

They regulate gas exchange, allowing CO$$_2 to $$enter and O$$_2 to $$exit the leaf.

Question 5

Which molecule acts as the final electron acceptor in the light reactions of photosynthesis?

Accepted Answer

NADP^+$

Question 6

What is the direct product of the Calvin cycle that can be used to synthesize glucose?

Accepted Answer

Glyceraldehyde-3-phosphate (G3P)

Question 7

Which of the following statements about the splitting of water in photosynthesis is correct?

Accepted Answer

Water is split to provide electrons and protons, and oxygen is released as a by-product.

Question 8

Which enzyme catalyzes the first step of carbon fixation in the Calvin cycle?

Accepted Answer

Rubisco

Question 9

Why is photosynthesis considered an endergonic process?

Accepted Answer

It requires an input of energy from sunlight to drive the reaction.

Question 10

Which of the following best describes the relationship between the light reactions and the Calvin cycle?

Accepted Answer

The light reactions provide ATP and NADPH to power the Calvin cycle.

Question 11

A plant is exposed to light with a wavelength of 700 nm. Which photosystem will absorb this light most efficiently?

Accepted Answer

Photosystem I (P700)

Question 12

Which of the following is a similarity between chemiosmosis in mitochondria and chloroplasts?

Accepted Answer

Both use an electron transport chain to generate a proton gradient across a membrane.

Question 13

If a plant's thylakoid membranes were punctured so that the interior of the thylakoid was no longer separated from the stroma, which process would be most directly affected?

Accepted Answer

The synthesis of ATP

Question 14

Which of the following best explains why shorter wavelengths of light have more energy per photon than longer wavelengths?

Accepted Answer

Energy per photon is inversely proportional to wavelength.

Question 15

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

Accepted Answer

G3P

Question 16

A scientist uses a spectrophotometer to analyze a pigment extract from a plant. What is the primary purpose of this instrument in photosynthesis research?

Accepted Answer

To determine which wavelengths of light are absorbed by the pigment.

Question 17

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

Accepted Answer

Heterotrophs depend directly or indirectly on photoautotrophs for food and oxygen.

Question 18

Which phase of the Calvin cycle involves the rearrangement of five molecules of G3P to regenerate RuBP?

Accepted Answer

Regeneration

Question 19

Which of the following best describes the fate of the oxygen atoms from water molecules during photosynthesis?

Accepted Answer

They are released as O$$_2$$ gas.

Chapter 8: Photosynthesis – The Process That Powers Life

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