BIOL10004 Chapter Notes - Chapter 16: Meristem, Embryogenesis, Mitosis
Document Summary
Following fertilisation: zygote undergoes rapid cell division to form an embryo, embryo, young plant formed within a seed by embryogenesis, embryogenesis. Sperm cell and egg cell fused to form zygote. Zygote divides by mitosis to produce 2 cells: begins after fertilisation, unequal size, one above the other, repeated division of upper cell gives rise to most of the cells in embryo although. Larger and lower of two cells subsequently divides to form filament of cells. Fertilisation initiates changes in flower: petals fall off, vary in sizes from tiny spheres less than 0. 1 mm in diameter to 10cm or larger, dormant embryos protected by seed coat or testa. Fertilised ovules develop into seeds: testa derived from integuments that surround embryo sac, often hard and composed of sclerenchyma, ovary wall forms layer around seed, monocotyledons or monocots, fruits contain single fertilised ovule, develops into grain. Integuments form outer protective layers: surrounding embryo and endosperm, single cotyledon.
