Question

Chlorophyll molecules are located in
A. Thylakoid membrane
B. Thylakoid lumen
C. Mitochondria
D. Inner chloroplast membrane.

Answer 1

Hint: Chlorophyll is a pigment present in the chloroplasts of plants. Since this pigment does not absorb light in the green region of the light spectrum, the plants having abundant chlorophyll molecules appear green to our eyes. Chlorophyll molecules help in the process of photosynthesis.

Complete answer:
Chlorophyll is the photoreceptor pigment of plants. They absorb light energy from the sun and convert it into chemical energy and help in the process of photosynthesis.
The chlorophyll molecules are present in the chloroplasts of plant cells. In the chloroplasts, there are membrane bound structures called thylakoids. The thylakoid membrane surrounds an aqueous lumen. The thylakoid membrane is where the chlorophyll molecules are present. Thus, the thylakoid membrane is where the light dependent reaction of the process of photosynthesis takes place. The inner structure of the thylakoid membrane is similar to the lipid bilayer. The lipids found in this membrane are primarily phospholipids and galactolipids.
The lumen of the thylakoid membrane is the site for photophosphorylation reaction of photosynthesis.
The mitochondria is a membrane bound organelle of the cell. It is the site of energy formation of the cell and is known as the powerhouse of the cell.
The inner chloroplast membrane is responsible for regulation of molecules in and out of the cell. Several fatty acids, carotenoids and lipids are formed here. However, chlorophyll is not present in the inner membrane.

Hence, the correct answer is option (A).

Note: Chlorophyll is a pigment found in green plants. It functions to trap energy from the sun and helps in photosynthesis. The pigment also imparts green colour to the plants. There are two types of chlorophyll – a and b. It is found in the membrane of the thylakoid of chloroplasts.