PLANT DIVERSITY
SUPERGROUP ARCHAEPLASTIDA
– KINGDOM PLANTS
SPORE
GAMETOPHYTE
GAMETOPHYTE SHEDDING
SPORE COAT
MATURE GAMETOPHYTE
(HERMAPHRODITIC)
Rhizoids
Antheridia (male)
Archegonia (female)
EGG IN ARCHEGONIUM
FLAGELLATED SPERM COMING
OUT OF ANTHERIDIUM
Colonization of Land – Adaptive
Radiation
• Limitations for terrestrial life
– Water availability
– Dispersal mechanisms
– Maintaining genetic diversity
• Result = great diversity of land plants
Vascular Tissue
• Long tubes: transport water
minerals and nutrients.
– Phloem: sugars/nutrients from
leaves
– Xylem: wter and minerals from
roots
• Made of special cells called tracheid
cells
• Tracheophytes
Alternation of generations
Haploid generation
(1n)
• Gametophyte
• Haploid gametes fuse to
form diploid zygote
– Diploid
generation (2n)
• Sporophyte
• Produce haploid spores
through meiosis
Moss and Liverwort Life Cycle
• Gametophyte is dominant form
• Lack of vascular tissue
– Low to the ground
• Swimming sperm (dependent on
water)
Fern Life Cycle
• Sporophyte is dominant form
• Vascular tissue present
– Can grow taller
• Swimming sperm (dependent on water)
Pine Life Cycle
• Sporophyte is dominant form
• Vascular tissue present
• Dispersal ability
– Sperm in pollen
– Seeds
Angiosperm Life Cycle
• Sporophyte is dominant form
• Vascular tissue present
• Flowers
– Pollination (dispersal and genetic variability)
– Double fertilization
TODAY’S LAB
• Fill out Table 5.2 with plant
characteristics – study for quiz
• Lab Report due next week: fern
lifecycle
• Plant presentations
Orchids
Horse Tails