http://www.potsaa.com/just-flowers/
How do flowers grow on trees and plants?
Both trees and small flowering plants evolved. My question is: which comes first, the tree or flower. If trees have evolved first, then I expect to see no flowers on the trees at all, or flowers that are radically different from those in plants. If plants have evolved flower before the trees, so I expect to see everything, or most, of flowering trees are light colored. So how is it that only a few trees have flowers, but small plants and flowers? I am not asking to prove a religious point of view. I'm honestly asking as a curiosity.
Flowers may have evolved more than once. By comparing the genomes of plants brought much of this review. If they have multiple origins and more than one current theories may be correct. The only thing they have in common is that small plants or trees in the understory where the first to develop a symbiotic relationship with insects, rather than relying only on the wind. Trees of Tall canopy as Archaeopteris progymnosperms or conifers true wind more easily invoked as with pollen altitudes could travel farther. Paleoherb or theory of "underhand grass" suggests little more herbs or grasses as it started. The plant began with separate single sex (dioecious) plants. These are the oldest known fossil evidence. A 120 million year old member of the pepper family, Piperaceae one. Small factories were weeds growing fast looking for colonizing disturbed soils. They came to this open habitat then had to find each other over long distances to mate. Large open habitats led the transition to the growth of floral structures to attract insects that aid in pollination. Thus flowers came as an adaptation to large open spaces to ensure sexual reproduction to long distances between flowers single sexed. However, another of these theories, supported by molecular studies, is the Magnoliid Woody or Euanthial theory that says small trees or woody shrubs (magnolia-like plants) with Cone flowers are as common ancestors. This syndrome of insect pollination as the driving force rather than habitat. It is suggested here that gametes exposed female conifer cone was gradually enveloped by a structure more and more protection. The structure became the ovary of the plant thereafter. The female gamete is exposed once the cone scales open for pollination and good food to feed on insects. If developed a cone shaped hollow in the female gametophyte there was more protection but has not been blocked from entering the pollen with the wind. More insects were involved in the delivery process more pollen attached the female gamete can become. Insects carrying the pollen could slip if the female gamete was when the wind does not push the male gamete are in. This shrub, short, under the trees to deal with leaves broad to capture the light penetrating the canopy and conifer Archaeopteris true. True flowering trees evolved from the first plants flowering. Like the diversity of insects increased significantly after the origin of flowering plants if the plants have adapted to all niches possible. http://palaeo.gly.bris.ac.uk/Palaeofiles/Angiosperms/coevolution.htm
Just For Laughs – Stolen Flowers
