Which statement about Piagetian conservation is true?

• A. It develops before counting
• B. It develops during the concrete operational stage
• C. It has no relation to weight
• D. It appears in the sensorimotor stage

Answer: (B)

Piagetian conservation is the understanding that a quantity remains the same even when its appearance changes—like the amount of liquid staying the same when poured into a differently shaped container. This awareness emerges when children enter the concrete operational stage, roughly ages 7 to 11, because they begin to use reversible thinking and decenter their view. They can imagine the steps backward and consider more than one dimension at once, so they can see that the amount of liquid, or the number of items, or the weight, remains invariant despite changes in shape, height, or arrangement.

Before this stage, in the preoperational period, children tend to focus on a single perceptual feature (centration) and can't reverse or systematically manipulate mental representations, so they typically give the incorrect answer on conservation tasks. In the sensorimotor stage, infants are just learning through actions and do not yet grasp the invariance concepts. By the time reasoning becomes more abstract in the formal operational stage, conservation is already understood for concrete situations, though can extend to more hypothetical reasoning.

So, the statement that conservation develops during the concrete operational stage is the most accurate reflection of how this understanding typically emerges in Piaget’s sequence.