Section 2 b) Specification

2.2 describe cell structures, including the nucleus, cytoplasm, cell membrane, cell wall, chloroplast and vacuole
AND
2.3 describe the functions of the nucleus, cytoplasm, cell membrane, cell wall, chloroplast and vacuole 

The nucleus is, simply put, the "brain" of the cell. It contains DNA with instructions of what the cell should do and controls the cell.
Cytoplasm is the medium in which all of the chemical reactions within the cell take place.
The cell membrane is a thin, semi-permeable layer that holds the whole cell together.
The cell wall is not found in animal cells, but in plant cells it is made of cellulose and functions as support for the cell.
Chloroplasts contain chlorophyll, which is necessary for photosynthesis. They allow glucose to be created with just sunlight.
The vacuole contains water and stores of glucose and minerals, and supports the structure of the cells too.

2.4 compare the structures of plant and animal cells.

Animal and plant cells both have cytoplasm, nuclei, and cell membranes, however they are differently shaped and plant cells have additional structures, such as chloroplasts, cellulose cell walls and sap vacuoles.