Light-Independent Reactions

Practice Problem 1:

Why is the Calvin cycle considered a dark reaction?

• It occurs only at night.

• It requires an absence of light.

• It turns the plant dark green.

• It can proceed in the dark.

Practice Problem 2:

What is carbon fixation, and how does it relate to photosynthesis?

• It is the absorption of CO2 from the air, and it occurs during the light-dependent reactions.

• It is the reduction of CO₂, and it occurs during the Calvin cycle.

• It is the conversion of CO₂ into organic compounds, and it forms 3-PGA.

• It is the production of CO₂ during regeneration, and it forms RuBP.

Tags

NGSS.HS-LS2-5

Practice Problem 3:

Which statement best distinguishes the light-dependent (L-D) reactions from the light-independent (L-IND) reactions?

• The L-D reactions occur in the thylakoid membrane, and the L-IND reactions occur in the stroma.

• The L-D reactions occur in the cytoplasm, and the L-IND reactions occur in the chloroplast.

• The L-D reactions occur in the chloroplast, and the L-IND reactions occur in the mitochondria.

• The L-D reactions occur in the stroma, and the L-IND reactions occur in the cytoplasm.

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

Practice Problem 4:

Which question can be answered by following the scientific method?

• What was the highest temperature that was recorded yesterday?

• What is the most interesting aspect of the light-dependent reactions?

• How does a change in temperature affect the stomata of a plant?

• How many stomata are there on this leaf?

Which is required for the light-independent reactions in photosynthesis to occur?

• water

• sunlight

• oxygen

• carbon dioxide

What is the source of the carbon dioxide that is used in photosynthesis?

• sunlight

• the soil

• the atmosphere

• the plant

Tags

NGSS.MS-LS1-6

In which type of environment are plants most likely to use a C₄ pathway of carbon fixation?

• cold and wet

• cold and dry

• hot and wet

• hot and dry

Which compound is a metabolic intermediate of the light-independent reactions in photosynthesis?

• ATP

• PGA

• RuBP

• NADPH

Which compound is produced during regeneration?

• PGA

• G3P

• RuBP

• rubisco

During reduction, PGA reacts with ATP and NADPH. What does ATP contribute to the reaction?

• carbon

• hydrogen ions

• electrons

• phosphate group