Question

what will happen if an earthworm is kept on a smooth glass plate or slippery surface

Answer 1

It may have less grip on smooth surfaces.

Answer 2

Earthworms have microscopic hairs or bristles which allow them get a grip on the surface and provide traction for forward and backward movement.

Since glass is smooth, the bristles can't get enough traction for movement and the earthworm doesn't move.

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