What is the folded membranous system of the inner membrane of the chloroplast called?

Which plastids do not contain any pigments?

Examine the figure:
$(a)$ Is this structure present in an animal cell or a plant cell?
$(b)$ Can these be passed on to the progeny? How?
$(c)$ Name the metabolic processes taking place in the regions marked $(A)$ and $(B)$.

Which of the following is not responsible for the color of the plant parts?

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.

Which pigments are responsible for the various colors of flowers,fruits,and seeds?