Here are some examples.
Y/N: If you pose questions as quick check-in questions in a Yes/No format, then some students may respond well to that and will quickly pipe up with their response. An example is, "Are turtles warm-blooded?"
Short answer: If you ask simple factual questions where the answer is very brief, maybe one or two words, then some students like that and will want to respond. An example is, "Are most turtles herbivores, carnivores, or omnivores?"
Open response: If you want to get students to talk longer and open up, you might want to give more space for them to respond. An example is, "What are some of the things you might need to feed a turtle if you kept it as a pet?"
But depending on your class's experience with teachers, you might need to try a few of these out and see. Sometimes students who haven't been asked many open-ended questions will take a little practice before they want to engage more. So the teacher needs to respond positively and with real interest.