List any four characters that are employed in human population census.

Give any four characteristic features of sponges.

Mention any four characteristics features of members belonging to class Amphibia.

State any four characteristics of members belonging to class Aves.

State any four characteristics of simple harmonic progressive wave ?

State any four characteristics of vector product of vectors.

What could be the reason behind enormous increase in human population?

It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the:

Find the population of a city at any time t,given that the rate of increase of population is proportional to the population at that instant and that in a period of 40 years the population increased 30,000 to 40,000.

Prepare a list of some animals that are found parasitic on human beings.