quiz04_review - Weed Science PLS 4601c Section 7644 and...

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Weed Science, PLS 4601c Section 7644 and Grad. – Prin. Of Weed Science AGR 6932 Section 9212 University of Florida - Davie http://grove.ufl.edu/~turf/weedscience/ Philip Busey, [email protected] 954-579-3932 (cell) June 3, 2009 Material from May 28 for Quiz #4 on June 4 Below are the main things from the book that might be on the quiz along with other discussion in class and some issue in the identification of weed species. Please also review Quiz 1, Quiz 2, and Quiz 3. Chapter 5, The plant system (+ lecture) 1. Plant structures (continued in #6, below) Know the parts of the flowering plant (in contrast gymnosperms and nonvascular plants), e.g., stems (rhizomes, stolons), leaves, roots, etc., etc. In class, I explained that the fruit is a mature ovary, a “seed” is a mature ovule (although “seed” more frequently is used as a unit of dispersal), and the types of fruits such as berries (including drupes and hesperidia) which are fleshy multi-ovule fruits, the caryopsis (very important) which is the dry single-ovule fruit of grasses with the fruit wall usually fused to the mature ovule, capsules (which split open to dehisce multiple seeds), and a samara which is a winged fruit good for dispersal by wind. What other kinds of “seed” structures can you think of that aid dispersal, and how? You should know (and this is not covered in the book) the parts of the flower, sepals, petals, calyx, corolla, pistil, ovary, ovule, style, stigma, stamen, anther, filament, and what they do. 2. Monocots vs. dicots Know that the dicots (dicotylendons) have two seedling leaves which you can see when dicotyledonous (usually broad-leaved) weeds germinate. Grasses germinate with only one apparent seedling leaf, and are monocots, however , what you are looking at is not truly the seedling leaf but the coleoptile which is a sheath that protects the emerging shoot. The true seedling leaf is a specialized structure that never gets out of the ground. Other differences are that monocots have flower parts generally in 3’s versus dicots 4’s and 5’s; monocots have parallel veined leaves, and dicots have reticulate veined leaves; pollen of monocots has a single furrow or pore, whereas dicots have three furrows or pores.
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Weed Science–Univ. Florida, Davie–Review for Quiz #4 Page 2 3. Grasses (grass family or Poaceae) Because grasses are so important as weeds and as crop plants you should be aware that there are 10,000 species of the grass family, that is, the
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quiz04_review - Weed Science PLS 4601c Section 7644 and...

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