Strictly speaking, none, since almost all biological specimens are asymmetrical at a detailed level. Every human being has an asymmetrical face, for example.
But an idealised lemon would have onle line of symmetry - along its long axis.
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4 Lines of symmetry
2 lines OF SYMMETRY
There is no such thing as 8 lines of symmetry. A circle, for example, has infinitely many lines of symmetry.
a cylinder has 29 lines of symmetry!
5 lines is symmetry