Q3 of 42 Page 1

What is ‘Saltation’ according to de Vries?

According to Hugo de-Vries, saltation is a single step, large mutation.


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1

Why are no variations seen in clones? State two reasons.

 2

Differentiate between a DNA and a RNA nucleotide.

 4

Write the scientific name of the organism Alexander Fleming worked on and discovered the first antibiotic. Was the organism he worked on a fungus or a bacterium?

OR


Suggest a method to overcome excessive inbreeding depression.


 5

Name the pollutant attributed to be the cause of ‘ozone-hole’ over the Antarctica region.

OR


List the greenhouse gases other than carbon dioxide.