Answer:
The nature of the cell membrane is semi- permeable. This means that it allows some of the molecules or ions to pass through it but others cannot pass through it.
The information in the question shows that the substance L moves inside the cell by passive transport. As it moves through the help of large proteins we can say that these proteins are channel or carrier proteins.
We can say that the substance L is moving by passive transport because as the concentration of L increases outside the cell, the rate of its entry into the cell also increases i.e along the concentration gradient.
