What is absent in the stroma of a chloroplast?

Choose the correct sentence.

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

An amyloplast stores .......... .

Which of the following statements is incorrect?

$S -$ Statement: The flattened sac-like structures arranged like a stack of coins are called grana.
$R -$ Reason: There are $40$ to $60$ grana in a chloroplast.