PLANT TISSUES. 1) Dermal Tissue  Form outermost layer of plant (like the skin)  Protects plant  Allows substances in and out through the stomata (will.

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Presentation transcript:

PLANT TISSUES

1) Dermal Tissue  Form outermost layer of plant (like the skin)  Protects plant  Allows substances in and out through the stomata (will discuss details later)

2) Vascular Tissue  Makes the transport system that moves minerals, water and other chemicals around plant (like circulatory system)  2 types of vascular tissue  Xylem transports water and minerals UP from roots  Made up of dead tissue  basically hollow tubes  Phloem transports water and sugar produced by photosynthesis up and down  Made up of living tissue

3) Ground Tissue  Form the bulk of the plant  Wide variety of functions:  **Where photosynthesis occurs**  Provide structural support  Storage

In root

In Stem

 copy from pg.130 into notes

Tissues Working Together  Plants need to perform photosynthesis CO 2 + H 2 O + light energy  C 6 H 12 O 6 + O 2 Plants need to be able to get reactants (carbon dioxide and water) to the chloroplasts!

Light  Chloroplasts: located in palisade layer and spongy mesophyll  Palisade layer: closely packed to capture light  Spongy mesophyll: loosely packed to allow movement of gases

Carbon Dioxide  Enter through stomata and then move through spongy mesophyll

Water  Water is absorbed into roots (via root hairs)  Water is transported from roots to leaves by xylem  Waxy cuticle and stomata prevent too much water loss

STOMATA  Openings in the dermal tissue that:  Control amount of CO 2 entering leaf.  Control amount of water lost

 Opening and Closing:  Each stoma is bordered by two guard cells

 Able to open and close by changes in amount of water in guard cells  Water flows in to guard cells, they swell and it causes stoma to open  Water flows out from guard cells, they shrink and it causes stoma to close

Factors Affecting Stomatal Opening  As Water Loss increases stomata close  Carbon dioxide concentration increasesstomata close  Light: stomata open in light and close in dark  Temperatures higher then 30 0 C to 35 0 C result in stomata closing  Also show a daily rhythm