Q20 of 30 Page 1

State the theory of Biogenesis. How does Miller’s experiment support this theory?

The theory of biogenesis states that the first form of life arose slowly through evolutionary forces from non-living molecules.

Miller's experiment supports this theory in the following way:


He created conditions of primitive Earth in a laboratory scale. He created electric discharge in a closed flask containing methane , hydrogen , ammonia and water vapour at high temperature. He observed formation of amino acids. And later on with other discoveries, other biomolecules were seen to be formed too. The conclusion that he came at from the experiment which supported the theory is about the chemical evolution of life.


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(b) State the sporopollenin significance with reference to its chemical nature.


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State the sporopollenin significance with reference to its chemical nature.

OR


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(b) Explain the role of initiator tRNA in the initiation of protein synthesis.


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(a) Name the two different categories of microbes naturally occurring in sewage water.

(b) Explain the role of microbes in cleaning sewage water into usable water.


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(a) Write the function of the following:- (Oviducal) Fimbriae

(b) Write the function of the following:- Coleoptile


(c) Write the function of the following:- Oxytocin