2 of 6 added 406 characters in body

# Jelly, 13 bytes

Œlf“aeiou”L%2


All test cases are at TryItOnline

How?

Œlf“aeiou”L%2 - Main link takes an argument - s
Œl            - lowercase(s)
“aeiou”    - string of lowercase vowels
f           - filter - keep only the vowels
L   - length - the number of vowels
%2 - modulo 2