BIOL 1030 Lecture Notes - Lecture 26: Pollen Tube, Sepal, Flowering Plant

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1030
• Professor: Scott Kevin

Document Summary

The three main traits for seed plants evolved for more successful sexual reproduction: the most successful were the angiosperms. Pollen tube got rid of the need for water for sperms transport. Monocots: 50,000 species: lilies, orchids, grasses, many economic plants for human uses. Dicots: 200,000 species: eudicots, include elms, willows, roses, peas, canola. Sepal: green and leaf like, encloses other flower parts (bud) Petals: often pigmented to attract pollinators. Form can be co-evolved with pollinator: wind pollinated plants have very reduced flowers. Carpel (angiosperms only: stigma - receives pollen, site of pollen tube germination, style - elevates stigma to make it more accessible to pollinators, ovary - encloses and protects the ovule. Nectaries may be present: at base of petals, offer sugar reward to pollinators, help to align pollinations. Each grain (kernel) as one flower origin. Corn cob is a population of individuals. Monocot: veins in leaf are parallel in stems vascular tissue is scattered.