Presentation on theme: "Bellwork: February 19 Copy the statement and question Underline key words."— Presentation transcript:
Bellwork: February 19 Copy the statement and question Underline key words
Science Fact of the Day: An ostrich's eye is bigger than its brain.
Transport System Essential Question: How does a plant use the transport system to maintain homeostasis?
Homeostasis refers to an organisms ability to maintain a stable internal condition Think-Pair-Share What are some examples of things your body regulates? **Regulate=maintain homeostasis***
Today we’re going to look at how plants maintain homeostasis.
Remember: Plant Parts/Systems Reproductive System = Flower (with male and female parts) Transport System = tissues in stem Nutrient System = Leaf + Root Structural Support System = Stem + Roots All of these parts and systems work together to help a plant maintain homeostasis.
Leaf diagram – palisade layer CO 2 Most chlorophyll
Gas exchange Leaves are designed to allow carbon dioxide to get to the main chlorophyll layer at the top of the leaf They have small holes called stomata on the under surface Each hole is open & closed by 2 guard cells
Stomata: openings in the underside of the leaf that allow CO 2, O 2, and H 2 O to move into and out of the leaf. Guard cells: specialized cells in the epidermis that control the opening and closing of stomata.
Stoma is a small hole Its size is controlled by 2 guard cells closed open
Stoma function is for gas exchange in the leaf Carbon dioxide oxygen Guard cell Provided plant is photosynthesising
Transpiration is the loss of water through leaves.
Osmotic pressure keeps a plant’s leaves and stems rigid. Wilting results from the lack of water—and therefore of the pressure in a plant’s cells.
Debrief: Explain how the plant would respond if… There was a drought? There was a flood? HOMEWORK: Plant Systems by Alyssa Dolny (youtube)
Mix-Freeze-Group I am the vascular tissue that transports nutrients through the plant. I am the structure around the stomata that allows gases to enter and exit the leaf. I am the process during which water is lost through the leaves. I am the vascular tissue that transports water throughout the plant. Phloem Xylem Guard CellTranspiration