English Medium Class 9 - CBSE Question Bank Solutions

Define intercropping. How does it differ with mixed cropping?

Write down disadvantages of crop rotation.

Write about three main criteria which should be considered while selecting the crops for rotation?

Why are leguminous crops desirable in crop rotation?

Explain various steps in hybridization of crop plants.

Define plant breeding? Describe the various methods of plant breeding.

Describe the biological method of weed control.

Classify plant diseases depending upon their occurrence and transmission.

Out of the following, an example of matter which can be termed as fluid is :

Mention three different ways in which insect pests can attack the crop plant.

Explain the methods of controlling insect pests.

A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is :

Give two examples each of

(a) Narrow leaved rabi season weed.

(b) Broad leaved kharif season weed.

Explain various methods of weed control.

Explain various effects of weeds on crop plants.

What are crop's pests? Suggest preventive measures to control pests.

What is the advantage of using insect resistant varieties?

Why is liquid (the hydraulic fluid) used to operate the brakes in a car?

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

Explain the mechanism of compost formation.