Photosynthesis Light Reactions AP Biology

The H+ concentration gradient is used to:

• make NADPH

• split a water molecule

• generate ATP

• form water

Answer explanation

The H+ concentration gradient is used to generate ATP.

What is the final product of the electron transport chain in photosynthesis?

• ATP

• NADPH

• Glucose

• Water

Answer explanation

The final product of the electron transport chain in photosynthesis is ATP, which is the correct choice. ATP is the main energy currency in cells and is produced during the light-dependent reactions of photosynthesis.

What is Carbon Fixation?

• When 3-PG is converted into G3P

• When sugar and energy interact to form the molecule RuBP, making the cycle start again

• When RuBP is formed

• It incorporates CO2 and binds it to RuBP using rubisco

Answer explanation

Carbon fixation is the process of incorporating CO2 and binding it to RuBP using rubisco, which is the correct choice.

Tags

NGSS.HS-LS2-5

Which system occurs first?

• Calvin Cycle

• Photosystem I

• Photosystem II

Answer explanation

Photosystem II occurs first in the process of photosynthesis. It is responsible for capturing light energy and initiating the electron transport chain.

Tags

NGSS.HS-LS1-5

Are photosystems light-dependent or light-independent?

• Light-independent

• Light-dependent

Answer explanation

Photosystems are light-dependent, meaning they require light to function properly. Light-independent processes, on the other hand, do not rely on light for their functioning.

Tags

NGSS.HS-LS1-5

Which statement about the Calvin cycle is FALSE?

• It uses the products of light reactions.

• It produces a three-carbon sugar (G3P).

• It produces carbon dioxide.

• It produces NADP+.

Answer explanation

The statement 'It produces carbon dioxide' is false because the Calvin cycle actually consumes carbon dioxide to produce a three-carbon sugar (G3P).

Tags

NGSS.HS-LS1-5

NGSS.HS-LS1-6

NGSS.HS-LS2-5

Where does carbon dioxide enter plants?

• The leaves

• Stomata

• Roots

• Stem

Answer explanation

Carbon dioxide enters plants through the stomata, small openings on the leaves that allow gas exchange.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Where does a plant absorb the water that it uses during photosynthesis?

• Leaves

• Stem

• Roots

• Petals

Answer explanation

Plants absorb water for photosynthesis through their roots.

Tags

NGSS.MS-LS1-6

What is the input for the light reactions?

• Light energy

• ATP

• NADPH

• H₂O

Tags

NGSS.HS-LS1-5

Which of the following is NOT a part of photosynthesis?

• Calvin cycle

• Light reactions

• Light independent reactions

• Krebs cycle

Tags

NGSS.HS-LS1-5