Gametophyte produces male female sex sperm

As with angiosperms, the lifecycle of a gymnosperm is also characterized by alternation of generations. In conifers such as pines, the green leafy part of the plant is the sporophyte, and the cones contain the male and female gametophytes Figure 1. The female cones are larger than the male cones and are positioned towards the top of the tree; the small, male cones are located in the lower region of the tree. Because the pollen is shed and blown by the wind, this arrangement makes it difficult for a gymnosperm to self-pollinate. Figure 1.

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Plant reproductive morphology

Lab Manual Exercise #8

Ferns are leafy vascular plants. While they have veins that permit the flow of water and nutrients like conifers and flowering plants, their life cycle is very different. Conifers and flowering plants evolved to survive hostile, dry conditions. Ferns require water for sexual reproduction. To understand fern reproduction, it helps to know the parts of fern.
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Antheridium

Haploid gametophytes of bryophytes spread by clonal growth but mate locally, within an area defined by the range of sperm movement. Rarity of establishment from spores or vegetative competition can result in unisexual populations unable to reproduce sexually. Females typically outcompete males, probably because females expend fewer resources than males on the production of gametes. Extreme sexual dimorphism—tiny males growing as epiphytes on much larger females—has evolved many times.
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New insights into the molecular dialogue between male and female during sexual plant reproduction show that even plant sex does not work without clear communication. Plants provide us with almost all of the food, feed, fuel, and fibers we need. Ninety percent of our daily energy intake comes directly or indirectly from flowering plants, the majority of which reproduce sexually. Even species that are able to propagate vegetatively usually retain the ability to remix their genomic composition by meiotic recombination, i. Classic plant breeding that results in the creation of new genetic combinations would be unthinkable without the recombination of specific traits by crossing male and female plants harboring them, followed by selection of the desired characteristics.
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