Which of the following structures is the functional unit in a Golgi complex?

Which of the following cell organelles is present in the highest number in secretory cells?

Rough Endoplasmic Reticulum $(RER)$ $= ..........P.............$
Smooth Endoplasmic Reticulum $(SER)$ $= ......Q...........$
What substances do the above Endoplasmic Reticula synthesize/secrete respectively?

In the following,what is the function of $SER$ (Smooth Endoplasmic Reticulum)?

Who first observed the Golgi apparatus?

Three morphological forms of the Golgi complex are: