Draw a neat and labelled diagram of a sarcomere.

Draw a neat and well labelled diagram of male reproductive system of a frog.

Draw a neat and labelled diagram for zone refining of metals.

Draw a well labelled diagram of HIV.

Draw a neat and labelled diagram for the refining of aluminium by Hoop's electrolytic method.

Long Answer Questions Five mark Each QUESTIONS FROM STATE BOARD EXAMINATIONS : (a) Draw a neat and well labelled diagram of pollen sac. (b) Draw a neat and well labelled diagram of embryo sac.

Write the equations and draw a neat and labelled diagram for the preparation of H_2SO_4 by contact process.

Draw a labelled diagram of sperm.