$A$: Chloroplast is a semi-autonomous organelle.
$R$: The ribosomes of the chloroplast are smaller than cytoplasmic ribosomes.

Bright colour of petals is due to the presence of

Which of the following statements is incorrect?

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.

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

Which of the following contains extra-nuclear genetic material?