Today is Tuesday, October 16, 2012

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Presentation transcript:

Today is Tuesday, October 16, 2012 Homework: Read Chapter 4, Lesson 2 Complete Chapter 4 Homework Packet (due Friday) Warm UP: Complete the Chapter 4, Lesson 1 Warm UP Review Sheet (at your desk)

Goal for Today Objective: SWBAT demonstrate the ability to design a leaf arrangement to maximize light absorption by building a model of their design and demonstrating it. SWBAT demonstrate an understanding of phloem and xylem tissues in plants. Standard: Life Science: Students know how sugar, water, and minerals are transported in a vascular plant.

Stems……. What do they do? 1) Hold leaves, fruit, and flowers - 2) Transport materials (water, minerals, and sugar)

Xylem Xylem - tissues that carry water and some minerals from the roots to the leaves A very common xylem tissue we think of is wood Most xylem cells are dead

Xylem….continued Materials are pulled up through xylem cells via capillary action AS WELL AS transpiration pull (plant sweat!) Most xylem cells are near the inside of a plant.

Phloem Phloem – tissues that carry sugar, produced by photosynthesis, away from the leaves to other parts of the plant that do not photosynthesize. Sugar moves through phloem tissues via the laws of diffusion gradients – sugar sources to sugar sinks (large amounts of sugar to lower amounts of sugar)

What are xylem and phloem tissues similar to in our bodies? Blood Vessels Woody stems – lots of xylem tissue Non-woody stems – less xylem tissue Why do you think woody plants would have more xylem tissue?