Grana present in chloroplast refers to

$A$ normal green male maize plant is crossed with a colorless female plant. The offspring are albino (colorless). This is because:

In the given figure,what do $a$ and $b$ represent respectively?

Osmophilic granules are present in

Chromoplasts may be of which color?

Select the correct match for $X$ and $Y$:

Column $X$	Column $Y$
$(1)$ Chromoplast	$(P)$ Protein storage
$(2)$ Chloroplast	$(Q)$ Site of photosynthesis
$(3)$ Leucoplast	$(R)$ Responsible for color of flowers,fruits,and seeds
$(4)$ Aleuroplast	$(S)$ Food storage