Monday, February 23, 2009
Photosynthesis in a metabollic pathway of which plants take Carbon dioxide and convert it into organic compounds, especially glucose, using the energy from sunlight. Photosynthesis occurs in plants, algae, and many species of bacteria, but not in Archaea. Photosynthetic organisms are called photoautotrophs, but not all organisms that use light as a source of energy carry out photosynthesis, since photoheterotrophs use organic compounds, rather than carbon dioxide, as a source of carbon. In plants, algae and cyanobacteria photosynthesis uses carbon dioxide and water, releasing oxygen as a waste product.
A fungus is a eukaryotic organism that is a member of kingdom. The fungi are monophylatic group, also called the Eumycota ("true fungi" or eumycetes), that is phylogenetically distinct from the morphologically similar slime molds (myxomycetes) and water molds (oomycetes). The fungi are heterotropic organisms possessing chitinous cell wall, with the majority of fungal species growing as multicellular filaments called hyphae a mycelium; some fungal species also grow as cells. Sexual and asexual reproduction of the fungi is commonly via spores, often produced on specialized structures or fruiting bodies. Some species have lost the ability to form reproductive structures, and propagate solely by vegetative growth.
Generally, the plants which do not grow flowers are said Non-flowering plants. Some famous non flowering plants are ferns and horsetails. Often horsetails are seen growing as weeds in gardens and fields. They can also grow on rocky slopes of mountains. Non flowering plants have survived for so long because they have been able to adapt to all the changes that have taken place on earth. Vascular plants (Psylotophyta, Equisetophyta & Lycopodiophyta); Ferns (Polypodiophyta); Gymnosperms(Pinophyta) are some important families of Non-Flowering plants.