Answer :

Grana is part of the thykaloid. Each stack of thykaloid (the individual disks) are called grana.Cristae are those twisted, curving-shaped inner membranes in mitochondria where cellular respiration occur.Vacuoles stores food, waste, etc.
Stroma is the fluid-like part in the chloroplast. Thykaloid is contained in the stroma. 

So, are the membranous sacs called thykaloid.

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