Hi, Frodis
Your question is the best solution depends on the size of the room, what position the students are sitting in, and whether or not acrylic panels are installed for shielding.
I don't know if this will fit what you want, but I will describe my idea as a reference.
1.A microphone speaker camera will be installed in each lecture room and connected to a PC.
2.One of the students will operate that PC and participate in the Zoom meeting
3.Students who have questions will raise their hands and speak up when asked by you.
4.If you want to get a good look at the student's face, you can ask them to come up to the camera and speak.
Depending on the size of the room and the acoustic environment, a microphone speaker camera, for example, the Logitech MeetUP, can be used in many cases.
The Logitech's recommendation for MeetUP is for huddle rooms, but the camera's wide 113° angle of view and the sensitivity of the microphone make it usable in larger rooms than recommended.
In addition, remote control of the camera's pan, tilt, and zoom may be supported from within a Zoom meeting.
According to my confirmation, remote control is possible with the lower-end model BCC950 and the higher-end model Rally PTZ Camera (CC4900E).