Pollination differs between angiosperms and gymnosperms in that most angiosperms entice animals to carry their pollen from plant to plant, while most gymnosperms rely on the wind carrying their pollen to other plants. There are many wind-pollinated angiosperms and a very few animal-pollinated gymnosperms, however. The methods angiosperms use tend to be more effective at spreading quickly, but gymnosperms, particularly conifers, are generally better adapted to cold or dry environments.
According to Tulane University, gymnosperms were the first major group of plants to emerge after ferns and their allies, displacing that earlier group as the dominant land plants. Angiosperms arose relatively soon after, however, and quickly displaced the gymnosperms in turn. Their dominance was not as complete, however, since one group of gymnosperms, the conifers, still dominate in colder regions and at higher altitudes.
Angiosperms have more advanced tissues and much more diversity than modern gymnosperms, in large part due to their more effective methods of pollination. This is particularly true in areas where insect pollinators are plentiful. However, even with wind-pollinated species, such as grasses, their ability to grow quickly allows them to be the pioneer flora in many environments, starting environmental succession even where later stages are dominated by gymnosperms.Learn More
Guava leaves are used primarily to make herbal tea, certain cosmetic and beauty products, and for medicines. Guava leaves, like the fruits and other parts of the plant, are considered safe for human consumption. The leaves of these tropical plants contain an abundance of minerals and antioxidants, which makes them suitable for adding to medicines, teas and cosmetic products.Full Answer >
The most common identifying characteristics of a black walnut tree are found in its leaves, bark, twigs and nuts. Oval, sharp-pointed leaves with indented edges alternate on the branches, with the largest leaves toward the center. The black or gray-brown bark shows heavy furrows and twigs are hollow inside.Full Answer >
Achnanthes placentuloides, Chamaepinnularia justa and Pinnuavis aleemii are three examples of the diatoms found on Earth. Scientists believe there are anywhere from 20,000 to 2 million different species of diatom on the planet, according to the University of Colorado, Boulder.Full Answer >
Quercus alba is the scientific name for the more common tree name of the white oak. The tree may also be referred to as stave oak, ridge white oak, forked-leaf white oak and the fork-leaf oak.Full Answer >