The structures that are formed by stacking of organized flattened membranous sacs in the chloroplasts are:

Options

(a) Grana
(b) Stroma lamellae
(c) Stroma
(d) Cristae

Correct Answer:

Grana

Explanation:

In chloroplast which are green coloured plastids, thylakoids are arranged in stacks like the pile of coins called grana.