question_answer

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

A)  cristae                 

B)  grana   

C)         stroma lamellae

D)         stroma

Correct Answer: B

Solution :

The structures that are formed by stacking of organized flattened membranous sacs (thylakoids) in the chloroplasts are grana. Chloroplasts are organelles found in plant cells that conduct photosynthesis. It is made up of three layers (membranes) (i) Smooth outer membrane (ii) Smooth inner (middle) membrane (iii) Innermost membrane It has thylakoid system, which is surrounded by the stroma and grana. Stroma is a alkaline, aqueous fluid which is protein rich. Grana is formed by stacking of organized flattened membranous sacs called thylakoid.