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Evolutionary history of plants


The evolution of plants has resulted in widely varying levels of complexity, from the earliest algal mats, through bryophytes, lycopods, and ferns, to the complex gymnosperms and angiosperms of toda...

Gymnosperms and Angiosperms - Tulane University


These gymnosperms soon became the dominant plants. ... Today we will examine both gymnosperms and angiosperms, and compare their ..... The larger female cones may persist for years (conifer = to bear cones). .... Most angiosperms, like roses, marigolds, and maple trees, are members of the Class Dicotyledones, the ...

angiosperm | plant | Britannica.com


Mar 8, 2016 ... The angiosperms are vascular seed plants in which the ovule (egg) is fertilized ... Except under certain conditions, these regions are the only areas in .... Collectively, the roots of an individual plant make up the root system and ...

Flowering Plant Reproduction II


Inside the pollen are two (or, at most, three) cells that comprise the male gametophyte. ... These three structures are often termed a pistil or carpel. ... Follow the link to view a larger image. ... Angiosperm male gametophytes have two haploid nuclei (the germ nucleus and tube nucleus) contained within the exine of the pollen ....

Angiosperm - New World Encyclopedia


Apr 3, 2008 ... Angiosperms comprise one of the two groups in the seed plants, the other group ... fixed the position of gymnosperms as a class distinct from Dicotyledons. .... In the larger of the two great groups into which the angiosperms are divided, ... The flower may consist only of these spore-bearing parts, as in willow ...

Plant Structure and Function


Within the Angiosperms, there are two plant groups, the Monocots and the Dicots. The distinction between these two groups is not always clear, but some general trends are ... Involved in conduct of water and ions in the plant; Typically composed of ... Found in all vascular plants; Vessels - shorter, larger diameter cells with ...

Angiosperms - Tree of Life Web Project


Click on an image to view larger version & data in a new window ... The angiosperms, or flowering plants, are one of the major groups of extant seed ... of gametophyte structure and development, and 5) phloem tissue composed of .... and both the fossil record and molecular-based trees identify these lineages as ancient.

SparkNotes: Plant Classification: Tracheophytes


Gymnosperms (coniferous plants) and angiosperms (flowering plants), known ... These seed coats prevent desiccation in a terrestrial environment and protect ... of support to the plant, contributing to tracheophytes' ability to grow much larger and ... of a tracheophyte contain vascular bundles composed of xylem and phloem.

Sexual Reproduction in Angiosperms - Boundless


Learn more about sexual reproduction in angiosperms in the Boundless open textbook. ... (b) In these scanning electron micrographs, pollen sacs are ready to burst, releasing ... The generative cell is contained within the larger pollen tube cell. ... The mature pollen grain is composed of two cells: the pollen tube cell and the .....

Stem & Root Anatomy - Wayne's Word


These two tissues extend from the leaves to the roots, and are vital conduits ... Dense masses of fiber cells is one of the primary reasons why angiosperms ... The water-conducting xylem tissue in plant stems is actually composed of dead cells. ... and basswood, the spring vessels are much larger and more porous than the ...

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plant | biology | Britannica.com


May 13, 2016 ... These carbohydrates, produced in photosynthesis, are broken down in a .... plants (angiosperms) and are generally regarded as composed of three classes. Some ... Mosses are classified as the class Musci in the division Bryophyta. ... the vascular plants and bryophytes is that the larger, more conspicuous ...

Sexual Reproduction in Angiosperms - Kimball's Biology Pages


The functions of the flower solve both of these problems. The Flower and Its Pollination. In angiosperms, meiosis in the sporophyte generation produces two kinds of ... a larger vegetative cell (also called the tube cell) inside of which is a ...

Evolution of Plants Facts, information, pictures | Encyclopedia.com ...


Plants are thought to have evolved from a class of freshwater green algae called the ... All other plants, including the ferns, gymnosperms, and angiosperms, are ... Taken together, these features allowed them to grow much larger than their ..... dividing cells (meristem ) that produces a body composed primarily of tissues, ...