Photosynthesis Light Reactions AP Biology

Photosystems are made of

• chloroplasts

• chromosomes

• chlorophyll

• cytoplasm

What is FALSE about the calvin cycle

• uses the light reactions products

• produces a three carbon sugar (G3P)

• produces carbon dioxide

• produces NADP+

Tags

NGSS.HS-LS2-5

Which plant would have the most oxygen produced in 1 hour?

• plant given red light only

• plant given blue light only

• plant given white light

• plant given green light only

Tags

NGSS.HS-LS1-5

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

• CO₂

• ATP

• NADPH

• H₂O

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

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.

Tags

NGSS.HS-LS1-5

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.

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.

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

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

• Reducing NADP+

• Splitting water molecules

• Chemiosmosis

• Electron transfer in photosystem II and I

Answer explanation

When oxygen is released as a result of photosynthesis, it is a direct by-product of splitting water molecules.