BIO153H5 Lecture Notes - Lecture 9: Vascular Tissue, Stoma, Flowering Plant
Document Summary
Raffle tickets for book package - /ticket or /2 tickets. Key adaptations of land plants in order to survive on land have two purposes: Survival - in air, with lack of water for nutrients and support. Embryo is contained and nourished by the parental plant. Problem: the embryo has to grow in the same place as the parental plant - competition for resources. Seeds contain the embryo and nutrients and are a way to transport the embryo away from the parent plant. This avoids competition for resources between parent and child plants. Angiosperms have their own set of adaptations for reproduction on land. Two male sperm and one female egg are used in fertilization. One sperm fertilizes the egg to form the 2n zygote. One sperm creates the 3n endosperm which is the nutritive tissue. Angiosperms have two structures: the stamen and the carpel. The stamen contains the anther, which produces sperm in microspores which form pollen grains.
