Question

write marits and di marits of classification

Answer 1

Merits of Mendeleev Periodic Table

Some gaps were left for the elements yet to be discovered. Thus, if a certain new element is discovered, it can be placed in a new group without disturbing any existing group.

Demerits of Mendeleev Periodic Table

He was unable to locate hydrogen in the periodic table.Increase in atomic mass was not regular while moving from one element to another. Hence, the number of elements yet to be discovered was not predictable.Later on, isotopes of elements were found which violated Mendeleev’s periodic law.

Answer 2

merits of classification.
by this process we are able to study all the features of an organism individually.
demerits.
viruses,viroids and lichens are not classified till date