Sept 23-08 - Plant Body - Structure and Nutrition Lecture

Sept 23-08 - Plant Body - Structure and Nutrition Lecture -...

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Josh Bovard Biology 111 – Tuesday, September 23 rd , 2008 Professor P LANT B ODY : S TRUCTURE AND N UTRITION : Two major groups of Angiosperms are Dicots and Monocots Their main differences are in their: Root system : fibrous root (monocot - no major root) vs. tap root (dicot – one major root) Leaf base : petiole (dicot) vs. sheath (monocot) Leaf venation : reticulate (monocots) vs. parallel (dicots – branched system) Plants continue to grow throughout their life because they have permanent embryonic regions or meristems Apical bud contain a shoot apical meritstem , produces the primary plant body, lengthening it Axillary bud Lateral meritsems produce the secondary plant body, thickening it The root cap is a protective structure, may release chemicals into the soil In stem, there are varying vascular bundles In dicots, they are arranged in a ring Cambium of adjacent vascular bundles gets joined forming a cambial ring The cell division activity of the cambial ring forms secondary xylem towards the inside and secondary phloem towards the outside This constitutes secondary growth In monocots, they are scattered New growth in initiated via primary and secondary growth
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This note was uploaded on 04/10/2010 for the course BIOL 112 taught by Professor Lasko during the Spring '08 term at McGill.

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Sept 23-08 - Plant Body - Structure and Nutrition Lecture -...

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