Other attributes of flower Plants
Although flowers and also their components are the major innovations of angiosperms, they are not the just ones. Angiosperms likewise have an ext efficient vascular tissues. Additionally, in numerous flowering tree the ovaries ripen into fruits. Fruits are regularly brightly colored, so animals are most likely to see and also eat them and disperse their seed (see Figure below).
You are watching: What are two characteristics of angiosperms
Brightly colored fruits attract animals that may disperse their seeds. It’s tough to miss out on the bright red apples on these trees.
Evolution of flower Plants
Flowering plants space thought come have progressed at least 200 million years earlier from gymnosperms like Gnetae. The earliest well-known fossils of flowering tree are around 125 million year old. The fossil flowers have male and also female reproductive organs however no petals or sepals.
Scientists think the the earliest flowers attracted insects and other animals, which spread pollen indigenous flower come flower. This greatly increased the efficiency of fertilization end wind-spread pollen, which might or could not in reality land on one more flower. Come take far better advantage that this “animal labor,” plants progressed traits such together brightly colored petals to attract pollinators. In exchange for pollination, flowers provided the pollinators nectar.
Giving cost-free nectar come any animal that occurred to come follow me was not an efficient use of resources. Lot of the pollen might be lugged to flowers of different species and as such wasted. Together a result, many plants evolved ways come “hide” their nectar indigenous all but very specific pollinators, which would be much more likely come visit only flowers the the very same species. For their part, animal pollinators co-evolved properties that enabled them to get to the surprise nectar. Two examples of this kind of co-evolution are shown in Figure below.
See more: Weapons And Fortifications Are Not Permitted, 26 Vocabulary Flashcards
The hummingbird has a lengthy narrow invoice to with nectar in ~ the bottom that the tube-shaped flowers. The bat is active at night, therefore bright white, night-blooming flowers attract it. In each case, the flower plant and also its pollinator co-evolved come become far better suited for their functions in the symdearteassociazione.orgtic relationship.
Some the the most recent angiosperms to evolve are grasses. Humans started domesticating grasses such as wheat around 10,000 year ago. Why grasses? castle have numerous large, edible seed that save a the majority of nutritious save food. They space also relatively easy come harvest. Due to the fact that then, humans have helped shaped the evolution of grasses, as shown by the example in Figure below. Grasses supply many of the food spend by human being worldwide. What other grass seeds perform you eat?