(b) Write any one use of lathanoid

Write one use of cement.

State any one use of yeast.

Schematic represention of DNA fingerprints are shown below: (a) Which one of the suspected individual may be involved in the crime ? (b) Write any other use of DNA fingerprinting.

(a) What is biogas ? Name the major component of biogas. (b) What are the raw materials used for making biogas ? (c ) Describe the construction and working of a biogas plant with the help of a labelled diagram. (d) Write any two uses of biogas. (e) Write any two advantages of using biogas.

In the space given below, write any four uses of air and water on the Earth.

Write any two uses of terylene.