Biology lecture 6 (1)

Biology lecture 6 (1) - Biol-111-2011-Lecture 6 Rajinder...

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1 Plant Body: Structure and nutrition Biol-111-2011-Lecture 6 Rajinder Dhindsa
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2 Two major groups of angiosperms: Dicots and monocots Pay attention to: Root system: tap root vs. fibrous root. Leaf base: petiole vs. Sheath Leaf venation: reticulate vs. parallel
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3 Modifications of stem Modifications of root
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4
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5 Vascular Bundles in stems In a cross-section of the stem, vascular bundles are arranged differently in dicots (in a ring) and monocots (scattered). In dicots, cambium of adjacent vascular bundles gets joined forming a cambial ring. The cell division activity of the cambial ring forms sec xylem towards inside sec phloem towards outside, constituting secondary growth. See next slide
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6 Secondary growth in stem gives rise to concentric annual rings You can determine the age of a tree by counting the number of rings in its cross section. of a tree gives its. How old is this tree? Within an annual ring, cells formed during wet season are larger than cells formed during drier season. Thus an examination of annual rings in tree cross- sections can tell us about past climate.
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7 Internal structutre of primary root Note the difference in the arrangement of vascular system in a dicot and a monocot primary root.
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8 Simple and compound leaves How can you tell a simple leaf from a leaflet of a compound leaf?
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9 Leaf structure and function: Cells for photosynthesis, cells for transport, and cells for gas exchange (CO 2 , O 2 and water vapour)
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10 Diffusion Osmosis is Diffusion
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