Lecture #7 - Biol-111-2010-Lecture 7 Rajinder Dhindsa Plant...

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1 Plant Body: Structure and nutrition Biol-111-2010-Lecture 7 Rajinder Dhindsa Clicker questions first !
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2 In which of the following groups of plants, did microphylls first appear? M o ss e s Lyc op ods Ferns Gymno sp erms A ngios p r m 23% 28% 6% 19% 23% 1. Mosses 2. Lycopods 3. Ferns 4. Gymnosperms 5. Angiosperms
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3 Which of the following provides better protection against harmful mutations? Sp o ro ph y t e G ameto p hy te Bo th eq u a ll I do n kno w 54% 3% 8% 35% 1. Sporophyte 2. Gametophyte 3. Both equally 4. I don’t know
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4 In which of the following groups of plants did stomata evolved first? Fern s H orse t a ils A ng ios p erms M o sses I d on ’t k n ow 33% 20% 4% 14% 29% 1. Ferns 2. Horsetails 3. Angiosperms 4. Mosses 5. I don’t know
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5 Which of the following groups of plants lacks motile sperms? H o r setails Liver w or t s Gymn p erm Advanced algae I d n’t know 11% 24% 2% 15% 48% 1. Horsetails 2. Liverworts 3. Gymnosperms 4. Advanced algae 5. I don’t know
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6 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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7 Modifications of stem Modifications of root
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8
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9 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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10 Secondary growth in stem gives rise to concentric annual rings
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This note was uploaded on 10/05/2010 for the course BIOL BIOL 111 taught by Professor Roffey during the Fall '09 term at McGill.

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Lecture #7 - Biol-111-2010-Lecture 7 Rajinder Dhindsa Plant...

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