Question 1

Which of the following best describes the relationship between the wavelength ($$\lambda) of $$light and its energy ($$E$$)?

Accepted Answer

$$E is $$inversely proportional to $$\lambda$$ ($$E \propto \frac{1}{\lambda})$$

Question 2

Which component of a photosystem is directly responsible for capturing photons of light?

Accepted Answer

The antenna complex (light-harvesting complex)

Question 3

During the light-dependent reactions of photosynthesis, what is the primary role of Photosystem II (PSII)?

Accepted Answer

To split water and generate oxygen, providing electrons to the electron transport chain

Question 4

Which of the following correctly lists the inputs and outputs of the Calvin Cycle?

Accepted Answer

Inputs: CO$$_2$$, ATP, NADPH; Outputs: Glucose, ADP, NADP$$^+$$

Question 5

How does ATP production in the light reactions of photosynthesis differ from ATP production in cellular respiration?

Accepted Answer

Photosynthesis uses photophosphorylation, while cellular respiration uses oxidative phosphorylation

Question 6

Which molecule is regenerated at the end of the Calvin Cycle, allowing the cycle to continue?

Accepted Answer

Ribulose bisphosphate (RuBP)

Question 7

In hot, dry weather, what is the main problem faced by C-3 plants?

Accepted Answer

They undergo photorespiration, which decreases photosynthetic efficiency

Question 8

What adaptation allows C-4 plants to minimize photorespiration in hot climates?

Accepted Answer

They spatially separate carbon fixation and the Calvin Cycle in different cell types

Question 9

Which of the following best describes the difference between C-4 and CAM plant adaptations?

Accepted Answer

C-4 plants use spatial separation, CAM plants use temporal separation

Question 10

Which of the following is a similarity between the Calvin Cycle and the Citric Acid Cycle (CAC)?

Accepted Answer

Both cycles regenerate a starting molecule

Question 11

A plant is found to open its stomata only at night and fix CO$$_2$$ into organic acids, which are then used during the day for the Calvin Cycle. What type of photosynthetic pathway does this plant use?

Accepted Answer

CAM

Question 12

Which of the following equations correctly represents the energy of a photon of light?

Accepted Answer

$$E = h 
u$$

Question 13

If a plant is exposed to light with a wavelength of 700 nm and another with 400 nm, which photon has more energy and why?

Accepted Answer

400 nm, because energy is inversely proportional to wavelength

Question 14

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

Accepted Answer

Glucose

Question 15

A mutation disables the primary electron acceptor in Photosystem I (PSI). What is the most immediate effect on the light reactions?

Accepted Answer

NADPH production will decrease

Question 16

Which of the following best explains why C-4 plants are more efficient than C-3 plants in hot, dry environments?

Accepted Answer

C-4 plants can fix CO$$_2$$ even when stomata are partially closed, reducing photorespiration

Question 17

Which of the following is a key difference between C-3, C-4, and CAM plants?

Accepted Answer

C-3 plants use only the Calvin Cycle, C-4 plants use spatial separation, CAM plants use temporal separation of carbon fixation

Question 18

Which of the following best describes the function of the antenna complex in a photosystem?

Accepted Answer

It transfers absorbed light energy to the reaction center chlorophyll

Question 19

In the Calvin Cycle, which step is analogous to the regeneration step in the Citric Acid Cycle (CAC)?

Accepted Answer

Regeneration of ribulose bisphosphate (RuBP)

Question 20

A scientist discovers a plant that fixes CO$$_2 in $$mesophyll cells and then transfers the fixed carbon to bundle sheath cells for the Calvin Cycle. What type of plant is this?

Accepted Answer

C-4

Photosynthesis: Light Reactions, Calvin Cycle, and Plant Adaptations

Study Guide - Practice Questions

Study Guide - Flashcards