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How does meiosis produce spores in plants?
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Plant reproductive system
A large bumblebee (Bombus species) pollinating a teasel flower head (Dipsacus species).
In plants, meiosis is the process by which the diploid sporophyte generation produces haploid spores. This occurs within specialized structures called sporangia.1234
The process follows these key steps:
- Sporocyte Formation: The sporophyte produces specialized diploid cells known as spore mother cells, or sporocytes (also called meiocytes).34
- Meiotic Division: These sporocytes undergo meiosis—a specialized type of cell division that reduces the chromosome number by half—to form haploid spores.541
- Spore Types: In many plants, particularly seed plants and some pteridophytes, this process is heterosporous, meaning two types of spores are produced: microspores (which develop into male gametophytes) and megaspores (which develop into female gametophytes). These are generated by their respective microsporocytes and megasporocytes.342
Once formed, these haploid spores germinate to produce the gametophyte generation, which eventually produces gametes through mitosis. This cycle of alternating between a diploid sporophyte and a haploid gametophyte is known as the alternation of generations.12