Growth and Development of different organisms

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Growth and Development of different organisms National 5 Biology Key Area 6: The Need for Transport (a) Plant Transport Systems National 4 Biology Key Area 4 Growth and Development of different organisms

Learning Outcomes for Topic 6 – Part A Explain why plants need a transport system Name the 2 transport systems in plants Give the function of each of the 2 plant transport system Be able to identify 7 structures in a leaf State the function of each structure State what is meant by ‘transpiration’ Describe the process of transpiration in a plant

Leaf structure

TASK: Mapping from Memory  INSTRUCTIONS Get into groups of 3 Decide which person is going to be the scribe – THEY ARE THE ONLY PERSON ALLOWED TO WRITE The other group members (runners) must take it in turns to go up the hidden leaf structure sheet and try to remember as much as possible in 30 seconds They then have to explain what was on the sheet to the scribe Repeat for the 2nd ‘runner’ (keep going for 5 minutes) The scribe can only see the hidden sheet after the task is over The runners are NOT allowed to write! RESOURCES FOR EACH GROUP: Pen/pencil Leaf structure diagram

Waxy cuticle Vein or vascular bundle Air Space Guard Cell Stoma

Protective layer of cells which is transparent to let light through. Structure Description Upper epidermis Palisade Mesophyll Spongy Mesophyll Vein Lower epidermis Guard Cells Stomata Protective layer of cells which is transparent to let light through. Rectangular cells which contain many chloroplasts for photosynthesis. Loosely packed chloroplast containing cells with air spaces between them to allow gas exchange Part of transport system. Contains xylem and phloem. Protective layer of cells on the underside of a leaf. Made up of epidermal cells, guard cells and stomata. Pairs of cell which change shape to open or close the stomata Pore on the lower leaf surface which allows entry of CO2 and exit of water and O2

Stoma Stomata Guard cells stoma

Stomata (plural) Stoma (singular) Each stoma is surrounded by a pair of guard cells. When guard cells are turgid (swollen) the stoma opens – day time When guard cells are flaccid (shrunken) the stoma closes – night time. Oxygen LEAVES the cell by diffusion Water LEAVES the cell by evaporation Carbon dioxide ENTERS the cell Bye bye! Bye bye! Come on in!