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Updated June 26, 2019 By Mary Dowd
Life as we know it would not exist without plants to convert sunlight and inorganic compounds into food energy. In Kingdom Plantae, plant species are classified according to their method of reproduction.
One group is the "seed plants," which can be divided into two subgroups called angiosperms and gymnosperms.
Angiosperm derives from the Greek words for "vessel" and "seed." Angiosperms include vascular land plants and hardwood trees with flowers and fruit. They reproduce by making seeds that are enclosed in an ovary.
Gymnosperm derives from the Greek words for "naked seeds." Gymnosperms include vascular land plants and softwood trees that do not have flowers and fruit. They are cone-bearing and reproduce by making naked seeds on cone scales or leaves.
Plant life evolved millions of years ago from primitive algae in the sea. Nonvascular mosses, liverworts and hornworts then arrived on the scene. These types of living species reproduce by fragmentation or spores. Next came seedless vascular plants like ferns and horsetails.
Plants with a vascular system were stronger and able to grow taller. Gymnosperms, like conifers and ginko biloba, appeared during the Paleozoic Era and reproduced by dispersing “naked seeds” not imbedded in flowers or fruit.
Angiosperms evolved later during the Mesozoic Era. Angiosperms adapted to a challenging terrestrial ecosystem by developing a complex vascular system, flowers and fruit. They reproduced by seed and spread quickly on land.
Gymnosperms and angiosperms are more highly evolved than nonvascular plants. Both are vascular plants with vascular tissue that live on land and reproduce by making seeds.
They are also classified as eukaryotes, meaning they have a membrane-bound nucleus.
Only angiosperms are known as flowering plants. Many have beautiful petals, fragrant blossoms and fruit that contains dozens of seeds. Angiosperms typically drop their leaves when the seasons change and chlorophyll production ceases.
By contrast, gymnosperms such as pine trees produce bare, uncovered seeds, usually in pine cones. Most gymnosperms have green, needle-like leaf structures; angiosperm leaves are flat_._ Angiosperm leaves are seasonal in their life cycle while gymnosperms are generally evergreen.
The flowers of angiosperms have male and female reproductive parts. Stamens are male sex structures that make pollen on their anthers.
Pollination occurs when pollen grains from the anther reach the pistil, which is the flower’s female structure. A pollen tube in a structure called the style helps the generative cell in pollen reach the ovarian embryo sac.
The generative cell in pollen splits into two sperm cells. One fertilizes the egg, and the other one helps make endosperm through a process known as double fertilization. Fertilized eggs mature into seeds protected inside fruit.
Sporophytes in gymnosperms make male and female gametophytes. For instance, male cones have male gametophytes (pollen), and they are smaller than cones with female gametophytes.
Wind carries pollen from male to female cones. The fertilized female gametophyte produces a seed on a scale inside the cone.
Pollination methods of angiosperms differ somewhat from those of gymnosperms.
Angiosperms rely on bird, bees and other pollinators, as well as abiotic factors such as wind and water. Gymnosperms rely solely on the wind to carry pollen between male and female reproductive parts.
Unlike angiosperms, some species of gymnosperms have been around since the days of the dinosaur. For example, cycads (in the division known as Cycadophyta) look like palm trees, but they are actually close relatives of Coniferophyta (conifers) and Ginkgophyta (the division that contains Ginkgo biloba).
Gnetophyta, like the Welwitschia mirabilis desert plant, have existed for at least 145 million years based on fossil evidence. The Welwitschia can live up to 1,500 years. DNA shows that it is closely related to conifers and other gymnosperms, although the plant also has flower parts. It has been speculated that angiosperms may have evolved from gnetophytes. The plant kingdom can be classified into 5 different types. Among them, Angiosperm and gymnosperm are to be mentioned. Both Angiosperm and gymnosperm have very similar plant structures. Angiosperms vs GymnospermsThe main difference between angiosperm and gymnosperm in that the development of the seed is different. Angiosperm plants can bear flowers, whose seeds develop into fruits, but in the case of gymnosperms, there is no flower, and neither the seeds turn into fruits. Angiosperms are flowering plants. It can be said that angiosperms are the most diverse in the plant kingdom. Angiosperms develop an endless variety of fruits and vegetables. Angiosperms do not require any special conditions to grow. There are found all around the world in the form of tall trees, shrubs,etc Gymnosperms are plants that are unable to bear flowers and fruits. They do not produce the seed enclosed in the ovary, and their seeds do not develop into fruits. The seeds are henceforth called naked seeds. Gymnosperms are typically vascular plants having two conducting tissues – xylem and phloem. Comparison Table Between Angiosperms and Gymnosperms
What are Angiosperm?Angiosperms are flower-bearing plants that bear seeds in them. The seeds of Angiosperm are formed in the ovaries of the flower. So basically, The flower of the plant is the reproductive organ. The flowers contain a long slender stick-like figure called stamen which contains pollens. The Pollens of the plants are scattered by animals. Angiosperms produce fruits for consumption by living beings and provide all foods derived from plants. Angiosperm can be easily be divided into 2 classes: 1)Monocotyledon and 2)dicotyledons. Monocotyledon as the name suggests that there is only 1 seed leaves or embryonic leaves. There are generally 3 floral petals present on monocotyledons, and the arrangement of vascular bundles in the stem is scattered. They have parallel veins and usually, the leaves are long and narrow Dicotyledon as the name suggests means that there exist two seed leaves which are also called embryonic leaves. A major characteristic of Dicotyledon is, there are generally 5 floral petals present in this class of plants, also The vascular bundles in the stem are arranged in concentric circles. Dicotyledon leaves have a network in veins with broad leaves. What are Gymnosperms?The plants that do not produce flowers but directly produce seeds are called gymnosperms. The seeds remain exposed and thus gymnosperm means naked seeds. The seeds are not produced within the ovary. The seeds are produced in a cone-shaped structure. Gymnosperm reproduces by altering the male and female cones, which is the reproductive organ of gymnosperms. Gymnosperms can be divided into 4 different types – Coniferophyta, Cycadophyta, Ginkgophyta, Gnetophyta. Coniferophyta categories of plants mainly are woody trees like conifers, pine, fur. Most of the plants prefer a cold climate for survival and are evergreen trees. The Cycadophyta category has either Male cones or female cones. They have large compound leaves that generally require a tropical climate for survival. However, these plants can also adapt to surviving in a swampy environment. Ginkgophyta plants have fan-like tree leaves. Most of these plant species are extinct now. The tree provides treatment for asthma and other circulatory disorders. The plant is also known for its wonders on memory enhancement. The tree is deciduous and its height can be up to 20-30 meters. Gnetophyta consists of shrubs, vines, and also trees. These are found in a tropical or temperate climate. Main Differences Between Angiosperms and Gymnosperms
ConclusionAngiosperms and gymnosperms are a major category of the plant kingdom. In the end, both of them bear seeds with a different procedure of bearing the seeds. Generally, angiosperms are more diverse in nature than gymnosperms. Angiosperms consist of about 80% of the plant kingdom. Both Angiosperms and Gymnosperms are vascular plants that can exceed a height of 100 meters. Angiosperms provide us with grains, seeds, fruits, and vegetables. Major Gymnosperms like pine, fur provides lumber, besides that gymnosperms also provide us soaps, varnish, perfumes, medicines, et Cetra. Gymnosperms are presently more than 200 million years older than Angiosperms. However, gymnosperms have less variety of species and many of them have gone extinct. The quick extinction of gymnosperms can be because of the absence of any protective layer around the seeds. References
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