How do plants stay standing up?

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How do plants stay standing up?

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Plant cells have a “wall” made from cellulose.

This provides the necessary structural rigidity to plant tissues that allows them to stand up, without a skeleton like ours.

Plants are made of small building blocks called cells. Animal cells are squishy and can’t really hold up any structures, which is why so many animals have skeletons. Plant cells have a rigid wall on the outside so they really are sort of like building blocks. They are strong enough to support the plant on their own. Their roots keep them from tipping over at the base

Now I assume this is referring to small and/or delicate plants and not trees and whatnot

It depends on the type of plant. Smaller plants (not trees) are held up by a combination of cellulose and water pressure. Cellulose is a type of molecule made by plants to store sugar, so it is kind of like the plant equivalent of fat (which animals use to store sugar for later). Unlike animals, most plants cover their cells with a hard external wall. The combination of this cellulose wall and the water inside the cells is enough to hold up smaller plants. When these plants get dehydrated, the cellulose alone isn’t enough to hold the plant up, so dry plants tend to droop.

Larger plants (trees) have evolved a new chemical called lignin to use as their cell wall. Lignin is much stronger than cellulose, so trees are stronger and can grow taller. Unlike smaller plants, the lignin alone is strong enough to hold up the tree, so they don’t droop when they are dry (although the leaves, which don’t have lignin, can still droop when dry).