Obsere the data given in the following table.
How was the threat to the lake due to pollution discovered ?

Obsere the data given in the following table. How do the above reasons lead pollution ?

Obsere the data given in the following table. How do you think weeds are more in the lake ?

Read the table and answer the following questions. How was threat to the lake due to pollution of the lake discovered ?

Obsere the data given in the following table. What are th reasons for decrease in lake area ?

Obsere the data given in the following table. What could be the reasons for the migration of birds to this lake ?

Obsere the data given in the following table. In which year lake - water spread are is more ? Why ?

Calculate the molarity of a solution of ethanol in water in which the mole fraction of ethanol is 0.040 (assume the density of water to be one). Use the data given in the following table to calculate the molar mass of naturally occuring argon isotopes :

Read the table and answer the following questions. How do the above reasons lead to pollution?

Weekly wages of 250 workers in a factory are given in the following table. Construct the histogram and frequency polygon on the same graph for the data given.

Observe the given table and answer the following questions How is the beak of a woodpecker?