1.18 From the Ground Up!

Why are plant cells always in such a regular pattern? All cells need to perform a specific function. All cells need to perform a specific function. This is called cell specialization This is called cell specialization In plants, one major role of cells is to transport water. In plants, one major role of cells is to transport water. Water is essential for plants to perform photosynthesis Water is essential for plants to perform photosynthesis

Hypothesis Since transporting water is one of the main functions of cells in plants, do you think that the regular pattern of plants cells has something to do with water transport? Since transporting water is one of the main functions of cells in plants, do you think that the regular pattern of plants cells has something to do with water transport?

Absorption Water is absorbed through the roots Water is absorbed through the roots It then enters the cells through the cell membrane. (see page 46) It then enters the cells through the cell membrane. (see page 46) Just as we have blood vessels to transport blood, inside the plant a xylem vessel is created to transport water. Just as we have blood vessels to transport blood, inside the plant a xylem vessel is created to transport water. The vessel is created when the walls between the cells dissolve leaving only the outer walls for support The vessel is created when the walls between the cells dissolve leaving only the outer walls for support This allows water to be transported quickly throughout the plant. This allows water to be transported quickly throughout the plant.

On the way down A similar thing happens to other cells in he plants creating a transport system down. A similar thing happens to other cells in he plants creating a transport system down. This system is called a phloem vessel. This system is called a phloem vessel. It transports sugars and other nutrients down from the leaves to the stems at roots for use and storage. It transports sugars and other nutrients down from the leaves to the stems at roots for use and storage.

Questions Complete questions: 1, 2, and 5 on page 49. Complete questions: 1, 2, and 5 on page 49. To be handed in!! Use a separate piece of paper and full sentences unless you copy out the questions. To be handed in!! Use a separate piece of paper and full sentences unless you copy out the questions.