CHAPTER 28

CHAPTER 28 - CHAPTER 28 THE PLANT KINGDOM: SEED PLANTS...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
CHAPTER 28 THE PLANT KINGDOM: SEED PLANTS Seeds o Consist of an embryonic sporophyte, nutritive tissue, and a protective coat Seed coat o Very thick multicellular layer that protects seeds AN INTRODUCTION TO SEED PLANTS Ovule o Megasporangium and its enclosed structures Integuments o Layers of sporophyte tissue that surround and enclose the megasporangium Gymnosperms o Produce seeds that are totally exposed o Ovary wall does not surround the ovules Angiosperms o Produce seeds within a fruit o Ovules are protected Xylem o Used for conducting water and dissolved minerals Phloem o Used for conducting dissolved sugar Alteration of generations o Spend part of their lives in the multicellular diploid sporophyte stage and part in the multicellular haploid gametophyte stage GYMNOSPERMS Classified into four phyla o Coniferophyta Conifers o Ginkgophyta Ginkgoes o Cycadophyta Cycads o Gnetophyta Gnetophytes Conifers are woody plants that produce seeds in cones Conifers o Most familiar group of gymnosperms Tracheids
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
o Long, tapering cells with pits through which water and dissolved minerals move from one cell to another Resin o Viscous, clear or translucent substance consisting of several organic compounds that may protect the plant from attack by fungi or insects Needles o Long, narrow, tough, leathery leaves Monoecious o Have separate male and female reproductive parts in different locations on the same plant Pines represent a typical conifer life cycle Sporophylls o Leaklike scales on male cones that bear sporangia on the underside
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/04/2008 for the course BIO 101 taught by Professor Martin during the Fall '08 term at Rutgers.

Page1 / 6

CHAPTER 28 - CHAPTER 28 THE PLANT KINGDOM: SEED PLANTS...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online