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Apr 27, 2017 · Last Updated: April 28, 2017. Gymnosperm Definition. Gymnosperms are a group of plants which produce seeds that are not contained within an ovary or fruit. The seeds are open to the air and are directly fertilized by pollination.
Gymnosperm seeds are usually formed in unisexual cones, known as strobili, and the plants lack fruits and flowers. Both groups use pollen to facilitate fertilization, though angiosperms have an incredible diversity of pollination strategies that are not found among the gymnosperms.
- Melissa Petruzzello
Aug 3, 2023 · Definition: Gymnosperms are the plants that are most ancient vascular, flowerless, seed-producing, and can reproduce through an exposed seed or ovule. They produce seeds without fruits which means the ovules and the seeds that develop from these ovules are not enclosed in the fruit wall.
Oct 14, 2024 · Gymnosperm, any vascular plant that reproduces by means of an exposed seed, or ovule—unlike angiosperms, or flowering plants, whose seeds are enclosed by mature ovaries, or fruits. The seeds of many gymnosperms (literally ‘naked seeds’) are borne in cones and are not visible until maturity.
In contrast, all seed plants, or spermatophytes, are heterosporous, forming two types of spores: megaspores (female) and microspores (male). Megaspores develop into female gametophytes that produce eggs, and microspores mature into male gametophytes that generate sperm.
In contrast, all seed plants, or spermatophytes, are heterosporous, forming two types of spores: megaspores (female) and microspores (male). Megaspores develop into female gametophytes that produce eggs, and microspores mature into male gametophytes that generate sperm.
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Sep 26, 2024 · (ferns and horsetails)—and the spermatophytes or seed plants of which there are two large groups, the angiosperms (meaning “vessel seeds”) and the gymnosperms (meaning “naked seeds”). Click on an image below to learn more .
