Biology Past Questions and Answers

28 g soil sample was heated to a constant weight of 24 g. When further heated to red hot and cooled, it weighed 18 g. What is the percentage of humus in the soil?

Which of the following diseases is NOT caused by a virus?

A centipede differs from a millipede by its

An organism having one pair of identical genes is

Plants which can survive in places where the water supply is limited are