Identify $X$ from the given figure of a chloroplast.

Is there a species-specific or region-specific type of plastid? How does one distinguish one from the other?

Which of the following is not found in the stroma of a chloroplast?

Plastids storing fat are called

Grana present in chloroplast refers to

Which of the following statements are correct?
$(A)$ The number of chloroplasts varies from $1$ per cell in $Chlamydomonas$, a green alga, to $20-40$ per cell in the mesophyll.
$(B)$ Out of the two membranes of chloroplasts and mitochondria, the inner membrane is relatively less permeable.
$(C)$ Thylakoids are arranged in stacks like the piles of coins called grana (singular: granum) or the intergranal thylakoids.
$(D)$ The stroma of the chloroplast contains enzymes required for the synthesis of carbohydrates and proteins.