How good are Botany and Zoology as optional subjects for UPSC Mains exam?

Sir/Mam

How good are Botany and Zoology as optional subjects for UPSC Mains exam?

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Botany and zoology both are PSC main examination of civil services. But there are lots of other subjects that you can choose like indian history, indian polity, geography etc. these are much better subjects to choose in the mains examination. Not to worry zoology and botany are even good enough if you have good commands over these two subjects.