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AEBI 210- Nov 21st.doc

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Biology (Agric & Envir Sc)
Course Code
AEBI 210
Jaswinder Singh

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Organisms 1- AEBI-210 001 November 21st, 2012 Anthophyta (Angiosperm) Lifecycle Angiosperms: Phylum Anthophyta contains flowering plants, which are the largest plant group Monocots -Flowers in 3s, one cotyledon, parallel veins, scattered vascular bundles -Pollen is uniaperturate (one opening) Dicots -Flowers in 4s or 5s, 2 cotyledons, netted veins, vascular bundles in a ring -Pollen is triaperturate (3 openings) Lifecycle: 4 pollen sacs (microsporangia) have microsporocyctes with tapetum (nutrient tissue) Microsporocytes divide by meiosis into 4 pollen grains (n) -Pollen grains have resistant sporopollenin outer walls arising from the tapetum -The intine (inner wall) is made of cellulose and pectin by the pollen cell Spore cell divides by mitosis into a tube cell and generative cell -The generative cell divides into 2 sperm cells Pollen grains are released when they are mature by the anther walls splitting Ea
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