Question

What is stroma lamellae and grana lamellae?

Answer 1

Hint: Derived from the Greek word for layer or bedspread, stroma could also ask other supporting structures like the connective tissues in organs or the fungal tissue that carries spores. Microscopic examination of the chloroplast reveals certain obvious features. It’s made from an outer membrane and an intricate network of inner membranes, forming stacks of disc-like structures called grana. Different grana are connected to every other through membranous extensions.

Complete answer:
Stroma commonly refers to the fluid-filled inner space of chloroplasts surrounding thylakoids and grana. Initially, the stroma was thought to easily provide support for the pigmented thylakoids. However, it's now known that the stroma contains starch, chloroplast DNA and ribosomes, also as all the enzymes required for light-independent reactions of photosynthesis, also referred to as the Calvin cycle.

Grana are connected by stromal lamellae, extensions that run from one granum, through the stroma, into a neighboring granum. The thylakoid membrane envelops a central aqueous region referred to as the thylakoid lumen. The space between the inner membrane and therefore the thylakoid membrane is filled.

The region of the stroma that interconnects the thylakoid stalks are called stromal lamellae which are present within the stroma region. The region in between the grana is named grana lamellae which are present within the grana region. Stroma lamellae don't contain chlorophyll whereas grana lamellae margin a neighborhood containing contain chlorophyll.

Note: Stroma lamellae connect thylakoids of two different grana. They increase the efficiency of photosynthesis by keeping grana at a distance in order that they are doing not clutter together. They’re also referred to as stroma thylakoids. They make sure that maximum energy from sunlight is captured in photosynthesis. The stroma lamellae also contain Photosystem I and chlorophyll.