These are the density stained reticular structures present near the nucleus, consisting of many flat, disc-shaped cisternae of $0.5 - 1.0 μ m$ diameter. These are

Chloroplasts

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Endoplasmic reticulum

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Mitochondria

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Golgi apparatus

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Solution

The correct option is A Golgi apparatus
Camillo Golgi discovered the Golgi apparatus as a reticular structure. Typically, it is $0.5 - 1.0 μ m$ in diameter but its shape and size depend upon the physiological state of the cell.
So the correct answer is 'Golgi apparatus'.

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Similar questions

μ

m

	Column - I		Column - II
(a)	Thylakoids	(i)	Disc-shaped sacs in Golgi apparatus
(b)	Cristae	(ii)	Condensed structure of DNA
(c)	Cisternae	(iii)	Flat membranous sacs in stroma
(d)	Chromatin	(iv)	Infoldings in mitochondria

	I		II
(a)	Thylakoids	(i)	Disc shaped sacs in Golgi apparatus
(b)	Cristae	(ii)	Condensed structure of DNA
(c)	Cisternae	(iii)	Flat membranous sacs in stroma
(d)	Chromatin	(iv)	Infoldings in mitochondria

These are minute biconcave disc-like structures, flat in the centre, thick and rounded at the periphery.

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