When green tomato fruits turn red,then

Which of the following plastids lacks pigments?

Where is starch stored in the plant cell?

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

Consider the following five statements $(A$ to $E)$ with respect to the chloroplast shown below. Select the correct option stating which ones are True $(T)$ and which ones are False $(F)$.
$A$. It is impermeable and lacks porins.
$B$. It is selectively permeable,having carrier proteins for transport.
$C$. Stacked thylakoids one over other which is the site of production of assimilatory power.
$D$. Present between two grana and contains enzymes of dark reaction.
$E$. It contains enzymes for the synthesis of sugar and proteins.

$A$

$B$

$C$

$D$

$E$

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