Choose incorrect statement regarding cells

1.  Mycoplasma, the smallest cell, is only 0.3 $\mathrm{\mu }$m in length while bacteria could be 3 to 5 $\mathrm{\mu }$m

2.  Hemoglobin associated human cells are about 7$\mathrm{\mu }$m in diameter

3.  The shape of the cell may not vary with the function they perform

4.  Nerve cells are longest cells 

Choose incorrect statement

1.  Leeuwenhoek first saw and described a living cell

2.  Robert Brown discovered cell

3.  Electron microscope revealed all the structural details of cell

4.  A large cell has a higher volume: surface ratio than a smaller cell 

Cell is the fundamental structural and functional unit of all living organisms because:

(1) Anything less than a complete structure of a cell does not ensure independant living.

(2) The metabolic reactions can only occur inside a living cell.

(3) Nucleic acids present in the cells ensure living state.

(4) The membrane bound organelles cause differentiation for proper functioning.

Identify the cell organelles labelled as A, B, C and D. Mark the correct option with respect to organelle and its function.

1.  A - Major site for synthesis of lipid.

2.  B - Performs the function of packaging materials, to be delivered to only intracellular targets.

3.  C - Sites of anaerobic respiration.

4.  D - Main arena of cellular activities