BIO1011 Lecture Notes - Lecture 20: Vascular Cambium, Vascular Tissue, Red Algae
10 Aug 2018
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Bio1011 lecture 20 +21 plant diversity 2. Sperm ultrastructure: long cylindrical nucleus: 2 flagella inserted asymmetrically. Life cycle: series of changes in form (return to the starting state: haploid: contains a single set of chromosomes in a cell, diploid: contains one set of chromosomes is inherited from the individual"s mother. While the second is inherited from the father. Charophyte algae lifecycle spores and gametes are haploid spores grow (divide mitotically) gametes fuse with other gametes to make a zygote. The challenge of living on land: restricted water availability, drying out, movement of water from the soil, adaptations to restricted water availability: reliance on water for moving gametes, cuticle, spores with sporopollenin, multicellular gametangia, water conducting tissue. Colonization of land by plants altered the planet: erosion, soil, geochemical cycles, caused by roots moving and growing in the soil. Low co2 atmosphere: caused by the evolution of trees.
