Question

why mitochondria called power house of cell give three similarities and one difference between mitochondria and plastid

Answer 1

Mitochondria is known as powerhouse of the cell because it creates energy for the cell. It releases energy in the form of ATP molecules.
Difference between mitochondria and plastid:
Mitochondria is known as powerhouse of the cell whereas plastids are known as kitchen of the cell. Mitochondria is related to production of ATP molecules whereas plastids are the main site of photosynthesis.

Similarities:
They both have their own ribosomes.

Answer 2

Mitochondria is known as power house of the cell because it produces energy to the cell in the form of ATP (adenosine triphopshate).

Three similarities between mitochondria and plastids are

have their own dna and ribosomes.
bounded by double membrane.
both make their own copies of division.

One difference between mitochondria and plastids is

Mitochondria is found in both animal and plant cell.

Plastids are found in plant and algae.