Why is the mitochondrion called the 'powerhouse of the cell'?

Write true or false for the following statement:
The chlorophyll in photosynthetic prokaryotic bacteria is associated with membranous vesicles but not with plastids.

$A$ cell will swell up if

Find out the false sentences from the following:
$I$. Golgi apparatus is involved with the formation of lysosomes.
$II$. Nucleus,mitochondria and plastid have $DNA$; hence they are able to make their own structural proteins.
$III$. Mitochondria is said to be the power house of the cell as $ATP$ is generated in them.
$IV$. Cytoplasm is called as protoplasm.

The Endoplasmic Reticulum membrane is similar in structure to the

When a living plant cell loses water through osmosis,there is contraction of the contents of the cell away from the cell wall. What is this phenomenon called?