Tag: biology

Gymnosperms are seed plants that lack flowers, relying primarily on wind for pollination. Wind pollination ensures efficient transfer of pollen from male to female cones over large distances. Animals and insects are typically involved in angiosperm pollination.

Progymnosperms are an extinct group of vascular plants that evolved from trimerophytes and served as precursors to seed plants and conifers. Fossil evidence indicates that they first appeared and diversified during the Devonian period. They are characterized by having fern-like foliage and secondary wood.

The wood of several Gymnosperms, particularly those of conifers is used in paper industry. Conifers wood is used as a structural timber and for making furniture.

Sequoia is the largest species on the planet. It belongs to the family Cupressaceae of Coniferales.

Conifers that belong to the largest and the economically most important component group of the gymnosperms and are known to consists of both living and fossil taxa. Represented by a number of species, the stems of conifers are composed of a woody axis containing primitive water- and mineral-conducting cells- tracheids. All living conifers are woody plants, and mostly evergreen trees, with a monopodial growth form.

Gymnosperm structural strength comes from tracheids (long tapered water-conducting cells) and wood fibers (thick-walled supportive cells). Vessels are mostly absent in gymnosperms (except Gnetum). Wood parenchyma stores nutrients but provides minimal structural support compared to fibers and tracheids.

Cycadofilicales, also known as Pteridosperms or seed ferns, are an entirely extinct order of gymnosperms.

Ephedra and Gnetum exhibit double fertilization, a process typically associated with angiosperms, making them exceptions among gymnosperms.

Ginkgo biloba is often called a living fossil because it has remained virtually unchanged for millions of years.

Deodar cedar is a conifer, evergreen, broadly pyramidal with gracefully pendulous branches, drooping central leader, spreading and flat-topped with age. Long branches bearing spur-like stems with whorled needles. Leaves are light blue or grayish green and softer. Deodar is not a dicot, fern or mosses.