Alternation of generation is a feature shown in

1. Analyze the question The question asks which group of organisms shows alternation of generation. This is a life cycle in which a haploid (n) gametophyte generation alternates with a diploid (2n) sporophyte generation.

2. Explain the concept

• The gametophyte (n) produces gametes by mitosis.
• The gametes fuse during fertilization to form a zygote (2n), which grows into the sporophyte (2n).
• The sporophyte produces spores by meiosis. The spores (n) grow into a new gametophyte.

Both generations are clearly visible in bryophytes (mosses and liverworts) and pteridophytes (ferns).

3. Evaluate the options

• A. Mosses: The leafy green plant is the dominant haploid gametophyte. The capsule on a stalk is the diploid sporophyte, which depends on the gametophyte. This is the classic example of alternation of generation. ✔
• B. Fungi: They reproduce by spores and have haploid-dominant life cycles. They do not show the classic gametophyte/sporophyte alternation of plants.
• C. Grasses: These are flowering plants. They technically have alternation of generation, but the gametophyte is greatly reduced (inside the flower) and is not a visible feature.
• D. Conifers: These are also seed plants with a reduced gametophyte, so the same applies.

In JAMB's treatment of the topic, the clearest and expected example is the mosses.

4. Answer The correct option is A. mosses.

5. Exam tip Remember: "Moss and fern show it best." If the options include mosses or ferns, choose them for alternation of generation. In seed plants (grasses, conifers), the gametophyte is microscopic and hidden.