Organelle other than nucleus,containing $DNA$ is

Where are genes located?

If you are provided with some vegetables to cook,you generally add salt into the vegetables during the cooking process. After adding salt,vegetables release water. What mechanism is responsible for this?

Name the functional unit of $DNA$ that carries genetic information.

Give the chemical composition and functions of plasma membrane and cell wall. Differentiate between the two.

The given diagram shows the longitudinal section of collenchyma tissue. Label the parts '$M$','$N$','$O$',and '$P$' in the given diagram.