Question

Какой корень в слове поздняя ?

Answer 1

Корень слова - поздн.

Answer 2

Поздняя
яя- это окончание 
позд- корень
н- суффикс

Answer 3

Root of the Word "поздняя"

The root of the word "поздняя" is "поздн".

This information is supported by the Russian language snippet from Source which states: "поздняя" and the snippet from Source which mentions "Root? Root (поздн.)".