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