Did Dobereiner's traids also exist in the columns of Newlands's Octaves ? Compare and find out.

Find out some interactions that exist between plants and animals.

State and give one example for Dobereiner's law of triad and Newland's law of octaves.

Compare the area of the folder papers with that of the roll. Do you find any increase in the area ? If so try to find out the reasons ?

Find out how much cellulose is made by all the plants in the biosphere and compare it with how much of paper is manufactured by man and hence what is the consumption of plant material by man annually. What a loss of vegetation!

In table-3 write the names of the organisms in the appropriate box according to where i they can be found. You could put the name of one organism in more than one column. If you put the organism in the colon in 'some other place', try to mention the place where you could find it.Some examples are filled in to help you. Copy the table 3 in your notebook. Try to enhance the list as much as you can. How many organisms are present in more than one column? Why did you place them here?

State and give one example for Dobereiner's law of triads and Newland's law of octaves.

Draw circles having different radius on à graph paper. Find the area by counting the number of squares, Also find the area by using formula. Compare the two answers.