“The main arena of cellular activity is 'A' and compartmentalization of a cell is due to the presence of 'B'. What are A and B respectively?
 

	A	B
1.	Nucleus	Plasma membrane
2.	Cytoplasm	Ribosomes
3.	Nucleus	Cell wall
4.	Cytoplasm	Membrane bound organelles

In both prokaryotic and eukaryotic cells, a semi-fluid matrix called cytoplasm occupies the volume of the cell. The cytoplasm is the main arena of cellular activities in both the plant and animal cells. Various chemical reactions occur in it to keep the cell in a ‘living state’.

The eukaryotes include all the protists, plants, animals and fungi. In eukaryotic cells there is extensive compartmentalisation of cytoplasm through the presence of membrane-bound organelles. Eukaryotic cells possess an organised nucleus with a nuclear envelope.