BI111 Chapter Notes - Chapter 93: Zygote, Sporophyte, Pollen Tube
Document Summary
Flower contains reproductive organs and female structures; petals & sepals surround reproductive organs. After fertilization, ovary develops into fruit which seeds in. An evolved from gymnosperms (gy) & diversified during cretaceous. An have more efficient vascular system & leaves than. Roots & stems modified for nutrient storage & carry out unique fertilization that maximize resource use efficiency. Cotyledons: support growth, provide stored reserves for expanding embryos, photosynthesizing after germination. Flower enables fusion of male & female gametes by pollinators. Stamen contains anther & filament (male part of flower), anther composed of 4 pollen sacs (house microsporocytes) Divide by meiosis = pollen grain splits into 2 sperm cells which are embedded w/in tube cell which grows pollen tube transports sperm to egg. Pollen matures, anther splits = pollen releases. Carpel (1 pistil) (female part) consists stigma (pollen received), style and ovary ovary wall forms fruit. Pollen tube delivers sperm to egg in ovule = zygote.
