Which generation of land plants produces spores?

Question

BlackTom AI · Accepted Answer

The sporophyte generation produces spores.

1) Relevant concepts:
- Alternation of generations: land plants alternate between a multicellular haploid gametophyte and a multicellular diploid sporophyte.
- Ploidy and division types: the sporophyte is diploid (2n) and undergoes meiosis to produce haploid (n) spores; the gametophyte is haploid and produces gametes by mitosis.
- Distinction between spores and gametes: spores are single cells that can develop into a new multicellular organism (gametophyte) without fusion; gametes (sperm and eggs) must fuse (fertilization) to form a zygote.

2) Step-by-step reasoning:
- A fertilization event (fusion of gametes) produces a diploid zygote (2n).
- The zygote undergoes mitotic divisions and develops into the sporophyte (2n).
- Cells in the sporophyte, located in sporangia, undergo meiosis (reduction division).
- Meiosis produces haploid spores (n). These spores disperse and germinate.
- Each spore grows by mitosis into a multicellular haploid gametophyte (n).
- The gametophyte forms gametes by mitosis; two gametes fuse to restart the cycle.

3) Calculations:
- No numeric calculations are needed; ploidy transitions are shown conceptually: 2n (sporophyte) —meiosis→ n (spores) —mitosis/growth→ n (gametophyte) —mitosis→ n (gametes) —fertilization→ 2n (zygote → sporophyte).

4) Why this is correct:
- By definition in the alternation-of-generations life cycle, the sporophyte is the generation specialized to produce spores via meiosis. This is a universal feature of land plants (bryophytes, ferns, gymnosperms, angiosperms), though the dominant generation can differ among groups.

5) Why other choices would be incorrect:
- Saying the gametophyte produces spores is incorrect because gametophytes produce gametes (not spores) by mitosis.
- Saying both or neither would contradict the fundamental roles: only the sporophyte produces spores; gametophyte produces gametes.

Conclusion: The correct answer is that the sporophyte produces spores, which matches the provided answer.

Which generation of land plants produces spores?单项选择题

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