Photosynthesis AP Biology

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

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 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.

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.

Tags

NGSS.HS-LS2-5

What is the primary function of the Calvin cycle?

• Regenerate ATP for use in the light reactions of photosynthesis

• Produce carbon dioxide for use in the light reactions of photosynthesis

• Produce oxygen by oxidizing water

• Produce simple sugars from carbon dioxide

Answer explanation

The primary function of the Calvin cycle is to produce simple sugars from carbon dioxide.

Which pigment, in the largest amount, would best suit plants for growing conditions where light has a green hue?

• Chlorophyll A

• Chlorophyll B

• Carotenoids

• A combination of all 3

Answer explanation

Carotenoids would best suit plants for growing conditions where light has a green hue. They absorb light in the blue and green regions, complementing the green light and enhancing photosynthesis.

Tags

NGSS.HS-LS1-5

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

• 1

• 3

• 6

• 12

Answer explanation

One sugar molecule is produced from every six molecules of carbon dioxide that enter the Calvin cycle.

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

What is the role of chlorophyll in capturing light energy during photosynthesis?

• Chlorophyll stores light energy

• Chlorophyll produces light energy

• Chlorophyll absorbs light energy

• Chlorophyll reflects light energy

Answer explanation

Chlorophyll absorbs light energy, allowing plants to convert it into chemical energy through photosynthesis.

Tags

NGSS.HS-LS1-5

How is ATP used in the process of photosynthesis?

• ATP is used to provide energy for the synthesis of glucose.

• ATP is used to store excess energy in the process of photosynthesis.

• ATP is not involved in the process of photosynthesis.

• ATP is used to convert glucose into energy.

Answer explanation

ATP is used to provide energy for glucose synthesis in photosynthesis.

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5