Why are plastids called the 'kitchens of the cell'?

Lysosomes arise from:

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?

Draw a plant cell and label the parts which:
$(a)$ determines the function and development of the cell
$(b)$ packages materials coming from the endoplasmic reticulum
$(c)$ provides structural strength to the cell to withstand hypotonic external media without bursting
$(d)$ is the site for many biochemical reactions necessary to sustain life
$(e)$ is a fluid contained inside the nucleus

Which of the following are covered by a single membrane?

List two differences between $SER$ and $RER$.