The Structure of a Chloroplast and Its Functions

What part of a chloroplast is responsible for capturing light energy during photosynthesis?

a. lumen

b. granum

c. stroma

d. vacuole

Answer:

b. granum

Thylakoid discs make up the granum of a chloroplast. The granum is a stack of thylakoid discs that contain pigments called chlorophyll, which are responsible for capturing light energy during photosynthesis.

The thylakoid discs are interconnected and embedded in a gel-like substance called stroma, which surrounds the granum. The stroma contains enzymes and molecules necessary for the synthesis of glucose. The arrangement of thylakoid discs in the granum enables efficient light absorption and conversion of light energy into chemical energy.

Overall, the structure of a chloroplast, including the granum, stroma, and thylakoid discs, plays a crucial role in the process of photosynthesis, where light energy is converted into sugars that provide energy for the plant.