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From the Ground Up!From the Ground Up!

Why are plant cells always Why are plant cells always in such a regular pattern?in such a regular pattern?

All cells need to perform a specific All cells need to perform a specific function.function.

This is called cell specializationThis is called cell specialization In plants, one major role of cells is to In plants, one major role of cells is to

transport water.transport water. Water is essential for plants to Water is essential for plants to

perform photosynthesisperform photosynthesis

HypothesisHypothesis

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

AbsorptionAbsorption

Water is absorbed through the rootsWater is absorbed through the roots It then enters the cells through the cell It then enters the cells through the cell

membrane. (see page 46)membrane. (see page 46) Just as we have blood vessels to transport Just as we have blood vessels to transport

blood, inside the plant a blood, inside the plant a xylem vesselxylem vessel is is created to transport water.created to transport water.

The vessel is created when the walls between The vessel is created when the walls between the cells dissolve leaving only the outer walls the cells dissolve leaving only the outer walls for supportfor support

This allows water to be transported quickly This allows water to be transported quickly throughout the plant.throughout the plant.

On the way downOn the way down

A similar thing happens to other A similar thing happens to other cells in he plants creating a cells in he plants creating a transport system down.transport system down.

This system is called a This system is called a phloem phloem vesselvessel..

It transports sugars and other It transports sugars and other nutrients down from the leaves to nutrients down from the leaves to the stems at roots for use and the stems at roots for use and storage.storage.

QuestionsQuestions

Complete questions: 1, 2, and 5 on Complete questions: 1, 2, and 5 on page 49.page 49.

To be handed in!! Use a separate To be handed in!! Use a separate piece of paper and full sentences piece of paper and full sentences unless you copy out the questions.unless you copy out the questions.