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Oct 8, 2024 · Gymnosperms, from the Greek words gymnos meaning “naked” and sperma meaning “seed,” are a diverse group of seed-producing plants known for their unprotected seeds.
- Gymnosperm Definition
- Examples of Gymnosperm
- Gymnosperm Life Cycle
- Related Biology Terms
- Quiz
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”, from the Greek, gymnos, “naked” and sperma, “seed”, develop their seeds on the surface of scales and leaves, which often grow to form cone or stalk shapes, con...
Conifers
Conifers, in the division Pinophyta or Coniferophyta, are the most numerous of the gymnosperms; woody and with vascular tissue, these are cone bearing trees and shrubs. Conifers can be found growing in all parts of the world, although they most notably dominate the boreal forestsof the northern hemisphere. Many are adapted to cold climatic conditions, with downward facing branches, which help to shed snow, and specific biochemical properties that provide resistance to freezing. Examples of co...
Cycads
The appearance of the cycads (division Cycadophyta) typically constitutes a single, stout, cylindrical, woody trunk and a crown of large, hard and stiff, evergreen compound leaves, which grow directly from the trunk in a rosette formation. The cycads are dioecious, meaning that each individual plant is either all male or all female. The cycads are partly xerophyte, which means they are adapted to survive in areas with very little liquid water, although their distribution largely centers aroun...
Gnetophytes
The gnetophyta are distinguishable within the gymnosperms because they have vessel elements, a system of channels mostly found in the angiosperms, which transport water within the plant. Covering 70 species over three genera, the gnetophyta are morphologicallyvariable, including trees, shrubs, stumps, vines and creepers with leaf shapes ranging from opposite, to whorled, scale-like and straplike. The distribution is determined by the genus: Welwitschia are unique to the Namib Desert and surro...
Gymnosperms reproduce with an alteration of generations, meaning their reproductive cycle has both haploid and diploidphases. As in all other vascular plants, gymnosperms have a sporophyte dominant life cycle (the sporophyte is the diploid multicellular stage, which comprises the body of the plant, i.e., a leafy tree). The gametophytephase is relat...
Angiosperm– The term for the group of flowering plants which reproduce via seeds contained within ovules.Vascular Plants– A large group of plants defined as those which have tissues (xylem and phloem) for conducting minerals and water throughout the plant.Non-vascular Plants– The group of plants without the xylem and phloem vascular tissues, although they usually transport water through other mechanisms.1. For a plant species to be ‘dioecious’, it must: A. Reproduce asexually B. Have both male and female organs C. Have separate male and female individuals D.Not reproduce 2. Which division of the gymnosperms is most commonly used to create paper? A. Conifers B. Cycads C. Gnetophyta D.Gingkophyta 3. What role does the cone have in the gymnosperm lif...
May 2, 2018 · Gymnosperms are vascular plants of the subkingdom Embyophyta and include conifers, cycads, ginkgoes, and gnetophytes. Some of the most recognizable examples of these woody shrubs and trees include pines, spruces, firs, and ginkgoes.
- Regina Bailey
The gymnosperms (/ ˈdʒɪmnəˌspɜːrmz, - noʊ -/ ⓘ JIM-nə-spurmz, -noh-; lit. 'revealed seeds') are a group of seed-producing plants that include conifers, cycads, Ginkgo, and gnetophytes, forming the clade Gymnospermae. The term gymnosperm comes from the composite word in Greek: γυμνόσπερμος (γυμνός, gymnos, 'naked ...
The family of gymnosperms consist of conifers, the cycads, the gnetophytes and the species of Gynkgophyta division and Ginkgo biloba. Let us have an overview of the characteristics, examples, classification and examples of gymnosperms.
Feb 28, 2021 · Gymnosperm reproduction differs from that of angiosperms in several ways (Figure 1). In angiosperms, the female gametophyte exists in an enclosed structure—the ovule—which is within the ovary; in gymnosperms, the female gametophyte is present on exposed bracts of the female cone.
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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.
