AP Biology Photosynthesis

What is one function of the pigments, other than chlorophyll, in the chloroplast?

• To block damaging wavelengths of light

• To absorb different wavelengths than the chloroplasts

• To provide different colors to the leaves

• To transfer energy to a separate photosystem beside the one using chlorophyll a and b.

Answer explanation

The pigments in the chloroplasts absorb different wavelengths than chlorophyll, allowing for a wider range of light absorption.

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

Answer explanation

The primary function of the light reactions of photosynthesis is to produce NADPH and ATP, which are essential for the Calvin cycle and the synthesis of glucose.

Tags

NGSS.HS-LS1-5

What supplies the electrons that are lost in Photosystem I?

• The electrons from Photosystem II

• Water

• Glucose

• Oxygen

Answer explanation

The electrons that are lost in Photosystem I are supplied by Photosystem II.

Tags

NGSS.HS-LS1-5

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

Answer explanation

NADP+ functions as an electron carrier.

Which of the following molecules is not needed for the Calvin Cycle?

• CO₂

• ATP

• NADPH

• H₂O

Answer explanation

H2O is not needed for the Calvin Cycle because it is not directly involved in the carbon fixation process.

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

Green plants reflect which color of light?

• Red

• Green

• All

• Red and Violet

Answer explanation

Green plants reflect green light.

Tags

NGSS.MS-LS1-6

The light reactions occur in the ________, and the dark reactions take place in the ________.

• Chloroplast / thylakoid membrane

• stroma / thylakoid

• mesophyl / stomata

• thylakoid membrane / stroma

Answer explanation

The light reactions occur in the thylakoid membrane, and the dark reactions take place in the stroma.

Tags

NGSS.HS-LS1-5

Where does the carbon used to form glucose come from?

• The soil

• CO₂ in the air

• From other carbohydrates

• Calvin Cycle

Answer explanation

The carbon used to form glucose comes from CO2 in the air.

Tags

NGSS.HS-LS2-5

Where is glucose synthesized?

• Photosystem II

• Photosystem I

• Calvin Cycle

• Glycolysis

Answer explanation

Glucose is synthesized in the Calvin Cycle, not in Photosystem II, Photosystem I, or Glycolysis. The Calvin Cycle is responsible for converting carbon dioxide into glucose during photosynthesis.

Tags

NGSS.HS-LS2-5

Where does the Calvin cycle take place?

• Stroma of the chloroplast

• Thylakoid membrane

• Outer membrane of the chloroplast

• Interior of the thylakoid membrane

Answer explanation

The Calvin cycle takes place in the stroma of the chloroplast. It is where carbon dioxide is converted into glucose during photosynthesis.