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CBSE - X - Biology

Evolution has exhibited a greater stability of molecular structure when compared with morphological structures. Comment on the statement and justify your opinion. 

Asked by सुधाकर 16th March 2017, 8:35 PM
Answered by Expert


Hi Rimjhim,

Morphological structures can be easily seen by us. Molecular structure; as the name suggests; are at molecular level. Various biomolecules are required to make an organism. Whatever diversity we see around us is because of diversity in morphological structure. Life began as simple forms and gradually it evolved into many complex organisms. Thus, it can be said that morphological structures show the least stability.

However, when we look at the molecular level all the organisms are made up of same biomolecules. DNA, protein, lipid, carbohydrates, etc. are present in all organisms. The structure of DNA is same in every organism, though the number of DNAs varies from one organism to another. Irrespective of the type of organism, a DNA molecule or a protein molecule would have the same structure. Hence, it can be said that molecular structures show great stability.

Answered by Expert 17th March 2017, 5:56 PM

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