"Germination is the growth of a seed which requires water, oxygen
and a temperature within a certain range. In some seeds light is also needed,
under these conditions the seed takes up water faster via osmosis".
Osmosis is not related to either oxygen or light levels - this sentence implies
"They will become germinated when they change from their original
colour to a cream colour".
This is a very strange definition of germination! The seed has only germinated
when you can see the young root or shoot protruding from it!
There is not really very much to assess here! The introduction is obviously
very important. In your method, which is OK in principle, you have made one
very basic mistake. You have forgotten to say that you should actually put the
seeds into the petri dish!!!! You should, incidenatlly, use AT LEAST 20 seeds
per dish. 50 would be better.