BIOL 211 Lecture 11: Angiosperms
Document Summary
Over 250,000 speices (most diverse group of plants) 80% of all the calories consumed by humans comes from 6 major agroculture plants: wheat, corn, rice, potatoes, manioc/cassava, sweet potatoes. Oogamous (small male gametes and large, less mobile female gametes) Angiosperms have: flowers (increases success of pollination through co-evolution, fruits (covered seeds to aid in seed dispersal, double fertilization (formation of zygote and endosperm) Support and attraction: petals, sepals, flower stalk, nectaries. Carpel (female structure) style: where pollen tube grows. Stamen (male structure) anther: produces pollen filament: supports anther. Non sexual structures: petal: aid in attracting pollinator sepals: protects developing flower. To produce sperm (in pollen) and eggs (in ovules) Many plant species have only one organism that pollinates it (plants and animals that co- evolved) Flowers provide many different types of rewards for their pollinators. Specific rewards to attract specific pollinators (so that pollen goes to the correct flower [same species])
