Botany notes Exam 3 - Dendrocronology Science of tree rings...

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Dendrocronology - Science of tree rings - Annual ring – 1 dark and 1 light colored section together - Lighter – “summer wood” - Dark – “fall wood” - Missing ring – caused by incliment seasonal weather - Develop fire history - Bristle Cone Pice – can grow up to 5000 years Gnetophyta - Most advanced gymnosperm - Only 3 living genera o Gnetum Vines and trees Shiny leathery leaves Only grow in tropics o Ephedra Used to make Mormon Tea o Welwitschia Grow in hottest, driest deserts of Africa Most of plant grows below the ground Stores water below the ground - Angiosperm traits – xylem cells, seeds, strobili look like flowers but are note - Gymnosperm traits – ovules are exposed, don’t produce flowers Anthophyta - Only angiosperm phyla
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- Commonly called the flowering plants - Enclosed ovules - 1 st fossil dates back to 125-130 million years ago - 100 million years ago totally dominated earth - Key characteristic – flower - Pollination – Transfer of pollen from anterh to stigma - Fertilization – sperm and egg fusing to create a zygote - Double fertilization – only occurs in anthophyta o Major evolutionary advancement o 2 sperm – 1 sperm fertilizes egg, other sperm fuses with polar nuceli to form endosperm o Sperm(n) + Egg(n) = Zygote(2n) o Sperm(n) + Polar Nuceli(2n) = Endosperm(3n)
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This note was uploaded on 04/07/2008 for the course BIO 1130 taught by Professor Stein during the Spring '08 term at Mansfield University of Pennsylvania.

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Botany notes Exam 3 - Dendrocronology Science of tree rings...

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