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 ?

Read the table and answer the following questions. What are the reasons for decrease in lake area?

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 ?

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

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

Read the table and answer the following questions. What are the reasons for chemical problems ?

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 :

Observe the following table showing different activities in the lake and thier influence. What are the reasons for chemical problems ?

To make rectangles of different dimensions on a squared paper using 12 adjacent squares.Calculate length and breadth of each of the rectangles so formed. Note down the values in the following table What do you observe? As length increases, breadth decreases and vice-versa (for constant area). Are length and breadth inversely proportional to each other?