Photosynthesis Chloroplast Structure 2

Question 1

Which chloroplast membrane system contains the photosynthetic pigments?

Accepted Answer

Thylakoid membrane

Answer

Photosynthetic pigments like chlorophyll are embedded in the thylakoid membrane.

Question 2

The fluid-filled space surrounding the thylakoids inside the chloroplast is called the:

Accepted Answer

Stroma

Answer

The stroma is the aqueous phase of the chloroplast where the Calvin cycle reactions take place.

Question 3

How many membrane systems does a chloroplast have in total?

Accepted Answer

Three

Answer

Chloroplasts have three membrane systems: the outer envelope, the inner envelope, and the thylakoid membrane.

Question 4

Stacked thylakoid discs within a chloroplast are collectively called a:

Accepted Answer

Granum

Answer

A granum (plural: grana) is a stack of thylakoid discs connected like a pile of coins.

Question 5

What is the primary function of the thylakoid lumen?

Accepted Answer

Maintains a proton gradient for ATP synthesis

Answer

Protons pumped into the thylakoid lumen create a concentration gradient that drives ATP synthase.

Photosynthesis Practice Test