I thought there was some flexibility here because with the apples - we are referring to a definite type of fruit but we aren´t refering to a definite group of apples.
Oh native speaker, please rescue us.
If someone asks, "what kind of food do you like?" which of these are acceptable answers?
1. Elma severim. (Best)
2. Elmayı severim. ( I´m not sure if this is grammatical, but it is heard in daily speech. However, you can´t ask, " Elmayı sever misin?" its "Elma sever misin?"
3. Elmalar severim. (Neither do I.)
4. Elmaları severim. ( What is a definite apple anyway?)
When talking about animals, you can say "Kedileri severim" or "Köpekleri severim" (The accusative case doesn´t make the objects definite here. I don´t know why, but you still have to use it with plural nouns.) ,as well as "kedi severim", "köpek severim", but not "Kediyi/köpeği severim since that would mean "I love the cat/dog".