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IB Biology HL - Plants Topic Leaf structure label the parts.... Slide 2 Slide 3 Write three comparisons between monocotyledons & dicotyledons Slide 4 Tissue Plan Diagrams of Dicotyledon Stem Slide 5 What are the main features of monocotyledons ? Explain why the specialised part of a leaf carry out each function absorption of light, gas exchange, support, water conservation, and the transport of water and transport of the products of photosynthesis. Slide 6 A panda walks into a caf. He orders a sandwich, eats it, then draws a gun and proceeds to fire it at the other patrons. 'Why?' asks the confused, surviving waiter amidst the carnage, as the panda makes towards the exit. The panda produces a badly punctuated wildlife manual and tosses it over his shoulder. 'Well, I'm a panda', he says, at the door. 'Look it up.' The waiter turns to the relevant entry in the manual and, sure enough, finds an explanation. 'Panda. Large black-and-white bear-like mammal, native to China. Eats, shoots and leaves.' Slide 7 Slide 8 Slide 9 Slide 10 Meristems generate new cells for growth of the plant. Apical meristems cause the stem and root to get longer. They can be found at the top of the shoot and at the tip of the root. Lateral Meristems produce the xylem and the phloem in the stems and roots. In trunks of trees the xylem produced causes rings of growth - and thickening of the trunk. http://www2.puc.edu/Faculty/Gilbert_Muth/ art0062.jpg Slide 11 Auxin is a plant growth substance that causes phototropism. Auxin is made by the cells in shoot tips. It then diffuses down both sides of the shoot. The auxin collects on the dark side of the shoot. Auxin stimulates cell elongation on the dark side of the shoot and causes shoots to grow towards light. Slide 12 End of this section..... Slide 13 Slide 14 THICK waxy cuticle Vascular bundle (xylem & phoem) Hairs on leaf - reduce air flow stomata in PITS stomata leaf rolled up Slide 15 Slide 16 stomata succulent leaf Slide 17 dicotyledonous seeds two cotyledons seed leaves - cotyledon true leaf cotyledons true leaf embryo radicle - "embryo root" Slide 18 Slide 19 Slide 20