What is the primary function of the light reactions of photosynthesis?

• To produce glucose
• To produce NADPH and ATP
• To use ATP
• To produce RuBP

What supplies the electrons that are lost in PS I?

• the electrons from PS II
• water
• glucose
• oxygen

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

What is the function of NADP+?

• It absorbs light
• It is an electron carrier
• It is a light-reflecting pigment
• It acts as long-term energy storage

Green plants reflect ________ light.

• Red
• Green
• All
• Red and Violet

The light reactions occur in the ________ and the dark reactions (Calvin cycle) take place in the ________.

• Chloroplast / thylakoid membrane

• stroma / thylakoid

• mesophyl / stomata

• thylakoid membrane / stroma

Where does the carbon come from that is used to form glucose?

• The soil
• CO₂ in the air
• From other carbohydrates
• Calvin Cycle

Tags

NGSS.HS-LS2-5

When oxygen is released as a result of photosynthesis, it is a direct by-product of

• reducing NADP+

• splitting water molecules

• chemiosmosis

• splitting carbon dioxide molecules

How many glucose molecules are produced from every six molecules of carbon dioxide that enter the Calvin cycle?

• 1

• 3

• 6

• 12

Tags

NGSS.HS-LS2-5

Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?

• The light reactions provide ATP and NADPH to the Calvin cycle, and the Calvin cycle returns ADP, Pi, and NADP+ to the light reactions.

• The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the Calvin cycle provides water and electrons to the light reactions.

• The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP.

• The light reactions provide the Calvin cycle with oxygen for carbon fixation, and the Calvin cycle provides the light reactions with sugars to produce ATP.

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

Which option best explains how photosystem II produces a high energy molecule?

• excited electrons from chlorophyll pass though an ETC and are captured by NADP+ to make NADPH.

• excited electrons from chlorophyll pass though an ETC that pumps H+ into the thylakoid. ATP synthase uses the H+ concentration gradient to make ATP.

• excited electrons from chlorophyll pass though an ETC that pumps H+ into the thylakoid. The H+ is used to convert NADP+ to NADPH.

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5