English Medium Class 9 - CBSE Question Bank Solutions for Science

What is meant by saying that 'the atomic mass of oxygen is 16' ?

One electron is present in the outermost shell of the atom of an element X. What would be the nature and value of charge on the ion formed if this electron is removed from the outermost shell?

What are the postulates of Bohr’s model of an atom?

The water conducting tissue generally present in gymnosperm is

______ are forms of complex tissue.

Xylem transports ______ and ______ from soil.

Why are xylem and phloem called complex tissues? How are they different from one other?

Organisms without nucleus and cell organelles belong to

1. fungi
2. protista
3. cyano bacteria
4. archae bacteria

Fungi shows ______ mode of nutrition.

Cell wall of fungi is made up of  ______.

Association between blue green algae and fungi is called as ______.

Match items of column (A) with items of column (B)

Fungi do not contain ______.

A fungus ______ can be seen without microscope.

Common fungi used in preparing the bread is ______.

Algae and fungi form symbiotic association called ______.

Give True (T) and False (F)

Funaria is a moss.

Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do.

Common cold is ______ disease.

Classify the following diseases as infectious or non-infectious.

1. AIDS
2. Tuberculosis
3. Cholera
4. High blood pressure
5. Heart disease
6. Pneumonia
7. Cancer