... a tendency to think in terms of primitive and advanced groups and that one group represents the ancestor of another: a moss evolved into a fern which evolved into a conifer and so on until we reach the flowering plants. However the plants we see today are all descendants of fossil plants ... cells and their wall constitute a pollen grain, or immature male gametophytes. Ovules from within the chambers of the ovary. One cell in the sporangium grows and then goes through meiosis, producing four haploid megaspores. This megaspore continues to grow, and its nucleus divides by mitosis three ti...

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• Approx Pages: 15
• Grade Level: High School