Practice Test: Photosynthesis and Light Reactions

1. Multiple Choice:

a. Why do we see specific colors in photosynthesis?

i. The absorption and reflection of light by pigments.

ii. The emission of light by chloroplasts.

iii. Random scattering of light.

b. Differentiate between high-energy light and low-energy light based on wavelengths.

i. High-energy light has shorter wavelengths.

ii. Low-energy light has longer wavelengths.

iii. Both i and ii.

c. What is the purpose of photosynthesis?

i. To produce oxygen.

ii. To convert light energy into chemical energy (glucose).

iii. To release energy stored in glucose.

2. Short Answer:

a. Write the overall equation for photosynthesis and identify what is reduced and what is oxidized.

b. Explain where each reactant and product play a role in the processes based on the overall equation for photosynthesis.

c. Describe the role and location of pigments, photosystems, antenna complexes, and reaction centers in photosynthesis.

3. True/False:

a. The Calvin cycle reactions occur in the thylakoid membrane.

b. NADP+ is reduced to form NADPH during the light-dependent reactions.

c. In cyclic photophosphorylation, electrons come from water molecules.

4. Matching:

Match the following terms to their correct descriptions.

a. Chloroplast structure

b. Location of light-dependent reactions

c. Equation for the Calvin cycle

i. Grana and stroma

ii. Thylakoid membrane

iii. 6 CO2 + 6 H2O → C6H12O6 + 6 O2

5. Short Essay:

a. Explain the role of NADP+ and NADPH in photosynthesis.

b. Describe the process of creating ATP in light-dependent reactions.

c. Differentiate between NAD(H), NADP(H), and FAD(H) in cellular processes.

6. Critical Thinking:

a. Discuss the importance of C3, C4, and CAM plants in different environments.

b. Explain the relationship between cellular respiration and photosynthesis.

c. Provide reasons for the variations in the types of pigments used in photosynthesis.

Answers:

1. a. i, b. iii, c. ii

2. a. 6 CO2 + 6 H2O → C6H12O6 + 6 O2; Reduced: CO2, Oxidized: H2O

b. (Answers may vary based on the student's explanation)

c. (Answers may vary based on the student's explanation)

3. a. False, b. True, c. False

4. i. b, ii. a, iii. c