BIO SCI 94 Lecture Notes - Lecture 10: Lignin, Vascular Tissue, Sporopollenin

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Nancy Burley

Document Summary

Seed: embryo + nutrition tissue + seed coat. Heterospory: 2 types of spores and associated with structure. Ex. pollen grain, which is a male gametophyte + sporopollenin. Conifer: sporophyte dominant; the gametophyte depends on sporophyte for nutrition. Wood: protective layer grown from secondary growth; helps with structure absorb water. Vessels: bigger gaps in primary and secondary cell wall. Ex. conifers such as redwood or pine. Angiosperms appeared in late mesozoic, radiated in cenozoic. First angiosperms loved shade and disturbed habitats. Antagonistic coevolution arms race : evolution of adaptations and counter-adaptations between competing species or between predator vs prey. Plant defenses against herbivory include mechanical (ex. thorns) and chemical (toxin) Pollination syndrome: close correlation between structure of flower, and size, shape, and behavior of its pollinators. Floral displays increase pollination success and efficiency. Female: carpel includes style + stigma + ovary. Monecious (2 sex) can produce perfect flowers (both sperm and egg)