The internal system of inter-connected membrane-limited sacs of chloroplasts are called
Which of the following is true about Chloroplasts?
(i) Chloroplasts are minute oval bodies bounded by a double membrane.
(ii) Their interior contains closely packed flattened sacs called thylakoids.
(iii) There are over 60 chloroplasts in a cell.
(iv) The pigment chlorophyll is contained in the empty spaces of thylakoids.