Q2 of 27 Page 1

State the two principal outcomes of the experiments conducted by Louis Pasteur on origin of life.

The two principal outcomes of the experiments conducted by Louis Pasteur on origin of life –


a) Life comes from pre-existing life


b) In the pre-sterilized flask, new life doesn’t come from the killed yeast but in the other flask exposed to air, new organisms occur from the killed yeast. Thus, dismissing the concept of spontaneous generation.

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1

British geneticist R.C. Punnett developed a graphical representation of a genetic cross called “Punnett Square”. Mention the possible result this representation predicts of the genetic cross carried.

 3

Name the layer of the atmosphere that is associated with ‘good ozone’.

OR


Mention the term used to describe a population interaction between an Orchid growing on a forest tree.


 4

What are ‘flocs’, formed during secondary treatment of sewage?

OR


Write any two places where methanogens can be found.


 5

At what stage does the meiosis occur in an organism exhibiting haploidic life cycle and mention the fate of the products thus produced.