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
CO: I will describe and analyze the transport system in plants. LO: I will write notes. I will draw a feedback loop. I will talk about the transport system with my peers.
Science Fact of the Day: An ostrich's eye is bigger than its brain.
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***
Homeostasis is maintained through feedback loops Negative feedback loop = when something goes wrong the opposite thing is added to return to the original condition – Ex. Shivering Positive feedback loop = when something goes wrong more of the same thing is added to return to the original condition – Ex. Blood clots when you cut your finger
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 carbon dioxide and oxygen to diffuse (move) into and out of the leaf. Guard cells: specialized cells in the epidermis that control the opening and closing of stomata.
Stomata are small holes Its size is controlled by 2 guard cells closed open
The stomata’s function is for gas exchange in the leaf Carbon dioxide oxygen Guard cell Provided plant is photosynthesising
Stomata open and close at different times of the day When it is light the plant needs CO 2 for photosynthesis so the stoma open At night (darkness) they close
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
Homeostasis Scenario: What would happen to the plant if there was a drought?
Homeostasis Scenario: What would happen to the plant if there was a flood?
Homeostasis Scenario: What would happen to the plant if there was extra carbon dioxide in the air due to some crazy person singing to it everyday?
Homeostasis Scenario: What would happen to the plant if there was not enough carbon dioxide in the air?