Lecture 5

Lecture 5 - Lecture 5 Seed Plants Book notes edited with...

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Lecture 5 Seed Plants Book notes edited with Class Notes Seeds - embryonic sporophyte, nutritive tissue, protective coat Ovule- a mega sporangium surrounded by integument (Layers of sporophyte tissue) usually after fertilization the seed coat develops from the integument Plants are divided into two groups based on whether or not a ovary wall surrounds the ovules or not. Ovary- structure that contains one or more ovules Two groups of seed plants- Sporophyte dominant 1. Gymnosperms- naked seed, ovary wall does not surround the ovules of gymnosperms a. Pine, spruce, hemlock and Ginkgo are examples of gymnosperms. 2. and angiosperms – flowering plant- produces seed with in a fruit ( a mature ovary) and the ovules are protected by the ovary wall a. Corn, cacti, apples, grasses. Palms and buttercups Heterospores- Produce micro and megaspores The Gymnosperms are usually classified into four phyla, which represent four different evolutionary lines. 1. Phylum Pinophyta (known as conifers) 2. phylum Ginkgophyta (known as ginkgo) 3. phylum cycadophyta (known as cycads) 4. Phylum Gnetophya (known as the Gnetophytes Conifers- Pines, spruces, hemlocks and firs most familiar group They are woody trees and shrubs that produce secondary tissues (wood and bark) Wood = Secondary Xylem (conduct water and dissolves nutrients) it is made up of Tracheids (Long tapering cells with pits through which water and dissolved nutrients minerals and move from one cell to another) Most conifers have leafs that are known as Needles- (long and narrow, tough and leathery)
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Most of these conifers are also Monoecious (They have separate male and female reproductive parts in different locations on the same plant) These reproductive parts are generally borne on cones. (strobili) Conifers – Pines – Know this!!!!! Each of the male cones (pollen cone) consists of
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This note was uploaded on 04/04/2008 for the course BIO 101 taught by Professor Martin during the Fall '08 term at Rutgers.

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Lecture 5 - Lecture 5 Seed Plants Book notes edited with...

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