Question

Number of thylakoids in a granum is
A. 10 – 100
B. 5 – 10
C. 100 – 200
D. 200 – 500

Answer 1

Hint: Thylakoids are the membrane-bound organelles found inside chloroplasts and cyanobacteria. They are responsible for the light-dependent reactions of photosynthesis. Thylakoids are made up of a thylakoid membrane and a thylakoid lumen. Chloroplast thylakoids build the stacks of disks which are known as granum.

Complete answer:
Thylakoids are small compartments which are noticed inside the chloroplasts. Thylakoids help in the absorption of sunlight in and play a major role in photosynthesis. They contain chlorophyll which allows them for the absorption of sunlight. The thylakoid is the site of the light-dependent reactions of photosynthetic processes as it requires sunlight.
Thylakoids are enclosed by a membrane like the other organelles. Thylakoids consist of a membrane known as the thylakoid membrane and it surrounds a lumen known as the thylakoid lumen. They are found inside of the chloroplast in a lump. The lumps of thylakoids are called a granum, or grana when multiple thylakoids are present. A stack of thylakoids or granum looks like a stack of coins arranged one after one. The outer-region of the thylakoids is known as the stroma. The stroma contains chloroplast DNA as well as some assorted ribosomes and enzymes.
The grana are linked by stromal thylakoids or intergranal thylakoids, they are basically connected to the bottom of the thylakoid and form a tunnel-like structure. The membrane of the thylakoid divides the chloroplast into two spaces; they are the thylakoid space and the stroma. It also is the site of some of the important light-gathering operations of the thylakoid.
Thylakoid is responsible for photosynthetic light-dependent reactions in the thylakoid membrane. the light-independent reactions take place in the stroma. In addition to these two compartments, the chloroplast is surrounded by a double envelope membrane, which plays a main role in intracellular communication.
For the formation of a granum, a minimum of two thylakoids is required. And the maximum number of thylakoids in a granum can be up to 100. Then from the given option, it can be said the number of thylakoids in a granum is 10 – 100.

Therefore, the correct answer to the question is option A.

Note: A membrane-bounded component present inside the chloroplast, is called thylakoids which consist of two-part; thylakoid membrane and thylakoid lumen. Thylakoids perform the photosynthetic light-dependent reactions in the thylakoid membrane. When more than one thylakoid joint and build a stack that looks like the stack of coins, is known as granum or grana. A minimum of 10 to a maximum of 100 thylakoids are required to build a granum.