Collect some articles and photographs from news papers and magazines about storms and cyclones. Make a story on the basis of what you learnt in this chapter.

Collect news from newspapers about milk production and impurities in milk. Prepare a note and display it on wall magazine.

Cut out a parallelogram from a sheet of paper again and cut along one of its diagonal. What kind of shapes you obtain ? What can you say about these triangles ?

Take a graph paper make same rectangles of same length and different width. Find the area for each. What can you conclude about the breadth and area?

Collect any plant from your surroundings. Draw its root structures. What can you say about its root system?

Is there cattle rearers in your village ? Make a talk with them and collect information about cattle rearing. For this you need a questionnaire. Following questions are help ful to you. You can add some more questions as your wish.

Stability of a crystal is reflected in the magnitude of its melting points'. Comment. Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from a data book. What can you say about the intermolecular forces between these molecules?

Refer to the Activity 3 in the chapter. Start with distilled water. The LED would not glow. Add two drops of some acid to distilled water and check the glow of LED. Add two more drops and check the intensity of the glow. Repeat the activity 5 to 6 times by adding 2 drops of the same acid each time. Do you see any difference in the intensity of glow with increasing acid content of water? What can be inferred from the above observations? Repeat the entire activity by taking a solution of baking soda and adding drops of it to distilled water instead of acid. Write differences and similarities. (AS_(3),AS_(1))

Did you ever face or hear about flood based on your personal experience or from the knowledge of news articles write few sentence on floods