Q1 of 48 Page 1

How many vertical columns are there in the modern periodic table and what are they called?

The vertical columns in the modern periodic table are known as groups and there are 18 groups in modern periodic table.


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2

What is speciation?

 3

Why should biodegradable and non-biodegradable wastes be discarded in two separate dustbins?

 4

"The chromosomes number of the sexually reproducing parents and their offspring is the same." Justify this statement.

 5

"A ray of light incident on a rectangular glass slab immersed in any medium emerges parallel to itself." Draw a labelled ray diagram to justify the statement.