Can a disease be detected before its symtoms appear? Name the principle involved.

What does PCR stand for? Write its principle and name the different steps involved in PCR.

Biotechnological techniques can help to diagnose the pathogen much before the symptoms of the disease appear in the patient. Suggest any two such techniques.

There is a paternity dispute for a child'. Which technique can solve the problem? Discuss the principle involved.

Suggest any two techniques which can help early detection of bacterial/viral infections much before the symptoms appear in the body.

What are the substrates used for vinegar production? Name the micro-organism involved in its production.

A white powder having an odour of chlorine is used to remove yellowness of which cloths in laundries. Name this powder, how is the prepared? Write the chemical reaction involved in its preparation?

Name the causative agent of malaria, Give the name of its vector and symptoms. Name two drugs which control the disease.

The blue colour of crystals of a substance changed on heating in a closed test tube but the colour was regained after some time on cooling. Name the substance and write its chemical formula. Explain the phenomenon involved.

Identify the compound of calcium which is yellowish white powder and is used for disinfecting drinking water. Write its chemical name and formula. How is it manufactured? Write the chemical equation for the reaction involved. Also list two other uses of the compound.

A sulphate salt of the group 2 element of the periodic table is a white, soft substance, which can be molded into different shapes by making its dough. When this compound is left in open for some time, it becomes a solid mass and cannot be used for molding purposes. Identify the sulphate salt and why does the show such a behaviour? give one reaciton involved.