Bio notes 1 - Notes Week 1 Biology 103 Spring 2008 Dr Karen...

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Week 1 Topic: Plant anatomy Reading: Chapter 42, sections 1-3 I have a friend who’s an artist, and he sometimes takes a view which I don’t agree with. He’ll hold up a flower and say, “Look how beautiful it is,” and I’ll agree. But then he’ll say, “I, as an artist, can see who beautiful a flower is. But you, as a scientist, take it all apart and it becomes quite dull.” I think he’s kind of nutty. .. There are all kinds of interesting questions that come from a knowledge of science, which only adds to the excitement and mystery of a flower. It only adds. Richard Feynman, What Do You Care What Other People Think? (1989, p. 11) Main concepts : The cell is the basic unit of all living things. Tissues are made up of one or more types of cells, organs are made up of tissues, and systems are made up of organs. Most groups of multicellular organisms, including plants, are made up of multiple organ systems. The organs and organ systems of a plant include roots (root system), stems, leaves, and flowers (shoot system) Plants are divided into two broad groups, the monocots (single cotyledon in the seed) and dicots (two cotyledons in the seed). A number of structural differences make these two groups fairly easy to tell apart: monocots: 3 petals and 3 sepals (though the sepals may look like the petals), parallel veins in the leaves, fibrous root system. dicots: flower parts in 4’s, 5’s, and 6’s, always has sepals distinct from petals, leaves have a network of veins, taproot system. All plant cells arise from meristem cells. These are rapidly dividing, undifferentiated cells found at the shoot tips, root tips, edges of leaves and petals, and in a cylinder around many stems. In general, plants grow
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Bio notes 1 - Notes Week 1 Biology 103 Spring 2008 Dr Karen...

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