पियाजे के अनुसार, 'संरक्षण' (conservation) का प्रयोग — पानी का उदाहरण:

उत्तर: (D) Pre-operational children think taller glass has more water even when same amount is pouredConservation: quantity doesn't change when appearance changes. Pre-operational children (2-7) fail — they focus on height (centration). Concrete operational children (7-11) pass — they understand reve...

Level 2Easy
पियाजे के अनुसार, 'संरक्षण' (conservation) का प्रयोग — पानी का उदाहरण:
Child Development & PedagogyPiaget's Cognitive Development

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