The best material for demonstrating streaming movements of protoplasm within living cells is

Which of the following statements are correct?
$I$. $PPLO$ is the smallest cell.
$II$. Prokaryotic cells are smaller than eukaryotic cells.
$III$. Cell division in prokaryotic cells is slow.
$IV$. All bacteria show solitary and colonial forms.
$V$. Cell division in prokaryotic cells is very rapid.

Which of the following is a nuclear stain?

Match List $I$ with List $II$:

List $I$	List $II$
$A$. Nucleolus	$I$. Site of formation of glycolipid
$B$. Centriole	$II$. Organization like the cartwheel
$C$. Golgi apparatus	$III$. Site for active ribosomal $RNA$ synthesis
$D$. Leucoplast	$IV$. For storing nutrients

Choose the correct answer from the options given below:

Select the correct option that matches the cell organelle with its function:

Cell Organelle	Function
$(A)$ Endoplasmic Reticulum	$(i)$ Powerhouse of the cell
$(B)$ Free Ribosomes	$(ii)$ Involved in osmoregulation and excretion
$(C)$ Mitochondria	$(iii)$ Lipid synthesis
$(D)$ Contractile Vacuole	$(iv)$ Protein synthesis

According to the modern colloidal theory,the cytoplasm is a polyphasic colloidal system. Who first proposed this?