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Chapter 23: Seed Plants Without Flowers - Coggle Diagram
Chapter 23: Seed Plants Without Flowers
Concepts
lignophytes
monophyletic group of woody plants
spermatophytes
seed plants
angiosperms
flowering plants
progymnosperms
conifers and cycads
gymnosperms
naked ovules/pine cones
Evolution of Seeds
micropyle
hole in the integument that allowed sperm to swim to egg
integument
layer of cell tissue
pollen chamber
holding area
Conifers
cone bracts
short axis bears leaves
suspensor
pushes other cells into megagametophyte
compound cones
shoot with axillary buds
proembryo
develop into the embryo
simple cones
single unbranched axis
ovuliferous scale
megasporophylls are fused laterally
Division Gnetophyta
Welwischia mirabilis
only species in the genus
Ephedra
40 different species
Gnetum
30 different species
Division Cycads
leaves
cycad foliage leaves do not bear ovules
short plants
less than 1 or 2 meters tall
Produce
seed cones and pollen cones