Why it is recommended to have a blood test before marriage?

why are tall chimneys recommended for factories?

Why is the zinc blende ore roasted before carbon reduction? Answer with balanced chemical equation.

In order to determine the volume of blood in an animal a 1.0 mL of sample of solution of 10^3 dpm of H^3 , is infected into the animal blood stream. After sufficient time for circulatory equilibrium to be established, 2mL of blood is found to have activity to 10 dpm. Calculate the volume of blood in the animal.

Sleeping pills are recommended by doctors to the patients suffering from sleeplessness but it is not advisable to take its doses without consultation with the doctor. Why?

Why blood pressure rises in old age?

According to Mendel what do you mean by dominant and recessive character in monohybrid cross? Evaluate how genetic counselling can help a man to take right decision before and after marriage.

Why do corn cobs have long tassels ?

Why does moon have no atmosphere?

Why the farmers dip the seeds in chemicals before sowing?