Ferns, lycopods, Selaginella , and horsetails - Alternation of generations: Mean

Question

Ferns, lycopods, Selaginella, and horsetails

- Alternation of generations: Meaning of this phrase, names of the generations

- What are the differences between a fern, lycopod, Selaginella, or horsetail

- Definition and Function of the following terms: stem/rhizome, crozier/fiddlehead, leaf/frond (petiole, lamina/blade, rachis, pinna, pinnule, frond division (simple, compound), sorus/i, sporophyte, gametophyte, sporophyte, rhizoids, sporangium, strobilus/i, node, internode

- Know the definition and function of these terms: spore, antheridium/ia, archegonium/ia, egg, sperm, homosporous, heterosporous

- Know whether a structure or organ is hapoid (N) or diploid (2N)

- What is the Fern Life cycle?

- Compare and contrast ferns, lycopods, and Selaginella (especially in terms of leaves, reproductive structures, fertilization, and gametophyte generations)

Explanation / Answer

1). Alteration of generations (or heterogenesis) means, the alteration of sexual phase and asexual phase of an organism in its life cycle.

Plants have an “alteration of generations,” the haploid gamete producing plant (gametophyte) alternates with the diploid spore producing plant (sporophyte).

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