sentence: Guard cells are able to open and close the stomates to save water.
sentences_before: Guard cell's are types of cells that surrounds stomates in plants. Plants lose water through stomates.
sentences_after: Guard cells are activated by sunlight. When water follows, the cells get hard and they push open. At night, guard cells lose water and close again.
concept_name: guard cell
headings: Guard cell
categories: Plant anatomy Cells