CTET Class I to V 29 Dec 2021 Paper

Seema, an EVS teacher asked students to collect objects around them like a metal pen, steel spoon, plastic spoon, and put the objects one by one in a bucket of water and observe whether they float or sink. Students asked her why steel spoon sinks, but plastic spoon floats. She did not think it was necessary to introduce 'density' to explain to them, because