Describe how eukaryotic plant cells store and remove waste materials.

Plant cells have large vacuoles, and these can be used for either storage of useful compounds, or the storage of waste substances - often accumulating at concentrations that lead to crystal formation in the vacuole.

Plants can also store the waste in organs that are destined to fall off (like autumn leaves) or die off (like the leaves and stalk of a bluebell which is dying back in the summer,leaving the bulb underground.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.