Symmetry in Nature

An application of reflectional symmetry.

A paper-delivery boy wants to park his cycle at some point $P$ and deliver the newspaper to houses $A$ and $B$. Where should he park the cycle so that his walking distance $AP+BP$ will be least?

Which letter together with its mirror image will form the letter.

$O$

Which letter together with its mirror image will form the letter.

$U$

How many lines of symmetry does a butterfly have?

Name five Indian historical monuments that have a line symmetry.