How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments

Typical growth curve in plants is :-

A man with blood group 'A' marries a woman with
blood group 'B'. What are all the possible blood
groups of their offsprings ?

A gymnast is able to balance his body upside down
even in the total darkness because of :-

Sliding filament theory can be best explained as :-

High value of BOD (Biochemical Oxygen Demand)
indicates that :-