{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Angiosperms are Flowering Plants

Angiosperms are Flowering Plants - efficiency of their...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Angiosperms are Flowering Plants Flowering plants, the angiosperms , were the last of the seed plant groups to evolve, appearing during the later part of the of the Age of Dinosaurs (the beginning of the Cretaceous, 140 million years ago). All flowering plants produce flowers . Within the female parts of the flower angiosperms produce a diploid zygote and triploid endosperm . Fertilization is accomplished by a variety of pollinators, including wind, animals, and water. Two sperm are released into the female gametophyte: one fuses with the egg to produce the zygote, the other helps form the nutritive tissue known as endosperm. The angiosperms ( angios = hidden) produce modified leaves grouped into flowers that in turn develop fruits and seeds.There are presently 235,000 known living species. Most angiosperms also have larger xylem cells known as vessels that improve the
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: efficiency of their vascular systems. Whence came the angiosperms? This was Darwin's "abominable mystery". Clearly angiosperms are descended from some group of Mesozoic-aged gymnosperm seed plant. ...but which one? The classical view of flowering plant evolution suggests early angiosperms were evergreen trees that produced large Magnolia-like flowers. Click here to view an illustration of suggested paths of floral evolution. However, this view has recently been contradicted by the oldest fossil yet found, a 140 million year old plant found by David Dilcher and his associates. The angiosperms underwent an adaptive radiation during the Cretaceous, and for the most part escaped the major extinctions at the end of the Cretaceous....
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern