Which organelle,other than the nucleus,contains $DNA$?

Classify the organisms on the basis of the number of cells. Give two examples each.

What are the consequences of the following conditions?
$(a)$ $A$ cell containing higher water concentration than the surrounding medium.
$(b)$ $A$ cell having lower water concentration than the surrounding medium.
$(c)$ $A$ cell having equal water concentration to its surrounding medium.

Which is the only cell organelle visible in a prokaryotic cell?

Name the organelles which show the analogy written as under:
$(a)$ Transporting channels of the cell ..........
$(b)$ Power house of the cell ............
$(c)$ Packaging and dispatching unit of the cell ...........
$(d)$ Digestive bag of the cell ...........
$(e)$ Storage sacs of the cell ...........
$(f)$ Kitchen of the cell .............
$(g)$ Control room of the cell ..........

What is the main function of a vacuole?