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.

Name the cell organelle/component which is

1. composed of cellulose
2. formed of an irregular network of tubular double membranes
3. a clear space with water or other substances in solution
4. visible only in cell division stages

Mention if the following statements are true or false. If false, suggest the change in the information underlined.

1. Prokaryotic cells have larger ribosomes.
2. Eukaryotic cells have mitochondria.
3. Amoeba is an example of Prokaryotes.
4. Nuclear membrane is present in bacteria.