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CSU - BC 103 - Life 103 4th Week - Class Notes

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CSU - BC 103 - Life 103 4th Week - Class Notes

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background image Seed Plants seed consists of an embryo and nutrients surrounded by a protective coat and 
provide energy for the embryo
seeds are —resistant to harsh environments, prevents desiccation (drying out) 
—can be dormant until environment is favorable
—allow for wide dispersal
gymnosperms - “naked” + “seed” -seed are exposed on sporophylls that form cones derived traits common to all seed plants —*reduced gametophytes (microscopic)
—*heterospory
—*pollen (air-borne)
—ovules
—seeds
gametophytes develop in the walls of spores retained within tissues of parent 
sporophyte
seed plants’ life cycles are dominated by the sporophyte most gymnosperms are cone-bearing plants called conifers seedless plants are homosporous, which produce one type of spore that develops 
into bisexual gametophyte
seed plants are heterosporous, which produce two types of spores, each of which 
develops into a male or female gametophyte
gymnosperm female anatomy —an ovule consists of a diploid megasporangium, a haploid megaspore  (produced by megasporangium), and the integument (protective coating) —megaspore develops into female gametophyte gymnosperm male anatomy —consists of a diploid microsporangium, a haploid microspore (produced by  microsporangium), and pollen —microspore develops into pollen grains, which contains the male gametophyte pollination - transfer of pollen to the part of a seed plant containing the ovules —released pollen grain reaches ovule and germinates
—pollen tube formed, digesting through megasporangium and discharging sperm 
nucleus into egg nucleus 3 major features of gymnosperm life cycle —miniaturization of gametophytes
—development of seeds from fertilized ovules
—transfer of sperm into ovules by pollen
life cycle of a pine —pine tree=sporophyte and produces sporangia in male and female cones
—small cones produce microspores called pollen grains—>male gametophyte
—large cones produce megaspores in ovules—>female gametophytes
—takes nearly 3 years from cone production to mature seed

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School: Colorado State University
Department: Biology
Course: Biology of Organisms-Animals and Plants
Professor: Jennifer Dewey
Term: Fall 2016
Tags: Biology
Name: Life 103 4th Week
Description: There are less notes due to the first exam this week, but I have uploaded the notes from the last lecture before the exam. The notes from today's (Friday's) lecture will be continued on Monday and uploaded next week.
Uploaded: 02/12/2016
2 Pages 9 Views 7 Unlocks
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