Question

What help to support the plant cell and help it to maintain its shape?

Answer 1

The cell wall.

Explanation:

The cell wall of a plant supports it and help maintain the plant its shape, it's like the plant's backbone. It is very rigid and is made of cellulose.

You can find more information here:

https://www.nature.com/scitable/topicpage/plant-cells-chloroplasts-and-cell-walls-14053956