What is the maximum magnification that can usually be achieved by

1. a compound microscope
2. an electron microscope?

Name the following:

1. Any two one-celled organisms.
2. The longest cells in animals.
3. Amoeboid cells in humans.
4. Shape of white blood cells.

Name the part of cell in which

1. many chemical reactions occur with the help of enzymes.
2. a network of chromatin fibres occurs.
3. cellulose forms the main component.

Differentiate between

1. an organ and an organelle
2. a plant cell and an animal cell pertaining to the presence of plastids.