Question

Which part of the plant cell permits it to withstand very dilute external medium without
busting?

Answer 1

it is cell wall of the plant cell permits it to withstand very dilute external medium without bursting

Answer 2

The cell wall permits the plant cell to withstand very 'dilute external medium' without bursting.

EXPLANATION:

The cell wall surrounds the "cell membrane" in the plant cell. The cell wall is turgid in nature and therefore opposes the pressure that is created when the cell becomes swollen.

This pressure if the cell wall was absent would lead to a lot of destruction of the plant cell. The cell wall bears the turgor pressure but does not burst and thus prevents the plant cell from being destroyed.