English Medium Class 9 - CBSE Question Bank Solutions for Science

Distinguish between polyp and medusa.

Write down four general characters of Porifera.

Write down four general characters of cnidarians (coelenterates).

Explain general characteristics of phylum Platyhelminthes.

Describe general characteristics of phylum Annelida.

Explain the general charaters of phylum Mollusca.

Explain the general characters of phylum Arthropoda.

Name major phyla of Animal kingdom. Write down one character and one example of each of them.

Describe the important characters of mammals.

What are pisces? Classify and explain two different kinds of fishes by the help of suitable examples.

Why is rabies is called hydrophobia? Explain.

It was diagnosed that the body of a patient has lost its power of fighting any infection. Name the disease he is suffering from. What type of microbe is responsible for this disease and how does it spread from one person to the other.

Why a person suffering from AIDS cannot fight even very small infections?

Mention two means of physical contacts by which AIDS does not spread.

Explain various modes of transmission of infectious diseases.

Differentiate between carrier and vector.

Write short note on organ-specific and tissue-specific manifestations of disease.

State whether the following statement is true or false :
Thomson proposed that the nucleus of an atom contains protons and neutrons.

Which part of an atom was discovered by Rutherford's alpha particle scattering experiment?

Give the evidence for the existence of nucleus in an atom.