English Medium Class 9 - CBSE Question Bank Solutions for Science

Distinguish between fertilizer and manure. Give suitable examples. What are advantages and disadvantages of using fertilizer?

Explain the mechanism of compost formation.

Explain what will happen if in a cultivated field only manures are supplied and in another field only fertilizers are supplied, keeping all other conditions similar.

Define irrigation. Why is irrigation of crops essential? Mention the harmful effects of excessive irrigation.

Explain various types of irrigation systems in India. How can efficiency of applied water be increased in agriculture.

Compare between mixed cropping and intercropping. Write down from advantage of both of these techniques.

Discuss the various methods which are used to control plant diseases.

Explain the various preventive measures against insect pests.

Write a short note on intercalary meristem.

Write one main function of

(a) Apical meristem

(b) Lateral meristem

What are meristematic tissues? Explain with the help of suitable diagram. Give their classification on the basis of their position in the plant body.

Which of the two diffuses slower : bromine vapour into air or copper sulphate into water ?

Why are gases so easily compressible whereas it is almost impossible to compress a solid or a liquid?

State whether the object possess kinetic energy, potential energy, or both :
A man climbing a hill _____________.

State whether the object possess kinetic energy, potential energy, or both :
A flying aeroplane _______________.

State whether the object possess kinetic energy, potential energy, or both :
A bird running on the ground ____________.

State whether the object possess kinetic energy, potential energy, or both :
A ceiling fan in the off position ______________

State whether the object possess kinetic energy, potential energy, or both :
A stretched spring lying on the ground ____________.

What kind of energy is possessed by the following?
 A stone kept on roof-top _______________