विज्ञान शिक्षण में 'मॉडल' (Model) किस प्रकार की शिक्षण सहायक सामग्री है?

उत्तर: (A) त्रिआयामी दृश्य / Three-dimensional visual — Models are 3D visual aids that represent real objects in enlarged/reduced form. Examples: heart model, solar system model, DNA model. They make abstract concepts concrete and help visualize structures...