BIO Lab 7: Production of Oxygen

What happens when Photosystem II absorbs light energy?

A. It converts oxygen into glucose.

B. It helps remove electrons from water.

C. It breaks down glucose to produce ATP.

D. It converts carbon dioxide into oxygen directly.

B

Which equation represents the oxidation of water during photosynthesis?

A. (2H_2O —> 4e^- + 4H^+ + O_2)

B. (CO_2 + H_2O —>C_6H_{12}O_6 + O_2)

C. (O_2 + 4H^+ + 4e^- —> 2H_2O)

D. (C_6H_{12}O_6 + O_2 —> CO_2 + H_2O)

A

What role do the electrons released from water play in photosynthesis?

A. They directly produce oxygen during cellular respiration.

B. They are used to reduce carbon dioxide and help produce energy-rich molecules.

C. They prevent ATP from being produced.

D. They are converted into protons.

B

What is one important role of protons during photosynthesis?

A. They help chloroplasts produce ATP.

B. They directly form glucose.

C. They absorb all of the light energy.

D. They remove carbon dioxide from the atmosphere.

A

What is the name of the alga used in this lab?

A. Spirogyra

B. Chlorella

C. Euglena

D. Volvox

B

What is the independent variable in this experiment?

A. The rate of oxygen production

B. The dissolved oxygen concentration

C. The quantity of light received by the Chlorella

D. The number of flashes detected by the photodiode

C

How is light quantity measured in this lab?

A. Photon fluence rate (PFR)

B. Oxygen concentration

C. Glucose concentration

D. ATP production rate

A

How is light quantity changed during the experiment?

A. By changing the amount of glucose in the culture

B. By changing the temperature of the light source

C. By placing the Chlorella culture at different distances from the light source

D. By changing the type of alga used

C

What is the dependent variable in this experiment?

A. Distance from the light source

B. Photon fluence rate

C. Rate of oxygen production by Chlorella

D. Type of light source

C

The rate at which the device produces flashes is proportional to which measurement?

A. The distance between the culture and the light

B. The amount of glucose in the culture

C. The dissolved oxygen concentration

D. The number of Chlorella cells alone

C

What does a higher rate of flashes indicate?

A. A lower dissolved oxygen concentration

B. A higher dissolved oxygen concentration

C. A lower photon fluence rate in every situation

D. No oxygen production

B

Which statement about oxygen is correct?

A. Oxygen directly produces glucose in the Calvin-Benson cycle.

B. Oxygen has no direct role in photosynthesis, but is important in cellular respiration.

C. Oxygen is used to remove electrons from water in Photosystem II.

D. Oxygen prevents organisms from extracting energy from glucose.

B