PLANT DIVERSITY

SUPERGROUP ARCHAEPLASTIDA – KINGDOM PLANTS

SPORE

GAMETOPHYTE

GAMETOPHYTE SHEDDING SPORE COAT

MATURE GAMETOPHYTE (HERMAPHRODITIC) Antheridia (male) Archegonia (female) Rhizoids

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