English Medium कक्षा ९ - CBSE Question Bank Solutions for Science

An atom with 3 protons and 4 neutrons will have a valency of

Which of the following in Fig. 4.2 do not represent Bohr’s model of an atom correctly?

Why does the skin of your finger shrink when you wash clothes for a long time?

Select the incorrect sentence

Bone matrix is rich in

Which of the following helps in repair of tissue and fills up the space inside the organ?

Which of the following cells is found in the cartilaginous tissue of the body?

Which of the following does not lose their nucleus at maturity?

A nail is inserted in the trunk of a tree at a height of 1 metre from the ground level. After 3 years the nail will

Cork cells are made impervious to water and gases by the presence of

Animals of colder regions and fishes of cold water have thicker layer of subcutaneous fat. Describe why?

Lining of blood vessels is made up of ______.

Water hyacinth float on water surface. Explain.

Bone possesses a hard matrix composed of ______ and ______.

______ have guard cells.

Give reasons for

We get a crunchy and granular feeling when we chew pear fruit.

Give reasons for

Branches of a tree move and bend freely in high wind velocity.

List the characteristics of cork. How are they formed? Mention their role.

Suppose a ball of mass m is thrown vertically upward with an initial speed v, its speed decreases continuously till it becomes zero. Thereafter, the ball begins to fall downward and attains the speed v again before striking the ground. It implies that the magnitude of the initial and final momentums of the ball are the same. Yet, it is not an example of conservation of momentum. Explain why?

Which of the above two graphs (a) and (b) (Fig.12.3) representing the human voice is likely to be the male voice? Give a reason for your answer.