Improvement In Food Resources — Science STD 9 — Question

Name the two types of waves which can be generated in a long flexible spring (or slinky).

Give an example each for the mixture having the following characteristics. Suggest a suitable method to separate the components of these mixtures:
One of the components changes directly from solid to gaseous state.

What is meant by saying that the latent heat of vaporization of water is 22.5 × 10⁵J/ kg?

Name two diseases caused by:

Infectious agents in polluted water.

Given examples of different rabi and kharif crops.

Name a liquid which can be classified as a pure substance and conducts electricity.

Why should we adopt crop rotation?

Fill in the blanks:
Soil supply ________ nutrients to plants.

Name two ecological problems which are caused by application of synthetic chemicals to crop fields.

Name two diseases caused by:

Toxic chemicals in polluted water.