not a teacher
(1) The leaves of grass are being dried. OR (2) The straws of grass are being dried. Which one is correct?
(3) Have you ever taken any interest in games? Correct?
"Straw" refers to the stalks of grains like wheat or barley, and usually after they have dried.
Dry grass, in my experience, is generally just called dry grass.
So (1) is the more correct, but without context I can't tell if it is a natural expression of the meaning you want.
Sentence (3) is correct.
Student or Learner