English Medium इयत्ता ९ - CBSE Question Bank Solutions for Science

Describe the biological method of weed control.

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

Classify plant diseases depending upon their occurrence and transmission.

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 of narrow leaved rabi season weed.

Explain various methods of weed control.

Explain various effects of weeds on crop plants.

What are crop's 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.

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.

Explain various types of irrigation systems in India.

Compare between mixed cropping and intercropping.

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

Explain the various preventive measures against insect pests.