Cell secretions are done by

Name the stain used to prepare slides like that of onion peel and cheek cell. Why is the use of stain necessary? Do all organelles absorb stain equally?

Identify the type of cell and write one characteristic feature for each of the following descriptions:
$(i)$ Large vacuole,nucleus pushed to the periphery.
$(ii)$ Cell does not burst even in a very dilute medium.
$(iii)$ Nuclear region is not well-defined and is known as the nucleoid.

Cell theory was given by

Name the largest known cell.

Which of the following can be made into crystal?