It belongs to phylum Bacillariophyta. They are especially important in oceans, where they are estimated to contribute up to 45% of the total oceanic primary production and 25% of global oxygen output. In fresh water most diatoms you will see are of the pennate type. Diatoms can be solitary or live in colonies that might be shaped like long chains, stars or zigzags. Modes of Nutrition # 1. Diatoms are eukaryotic organisms belonging to the Kingdom protista. Most scientists break up diatoms into two major groups: Centrales, the centric diatoms, and Pennales, the pennate diatoms. Because diatoms have a transparent cell wall, you can see the chloroplasts inside the cell. Diatoms feed the oceans, lakes and rivers. Composed of the cell walls/shells of single cell diatoms, it easily crumbles to a fine powder. Scientists estimate there could be as many as 2 million species of diatoms — new species are discovered every year. Diatoms, one of the largest groups of organisms on Earth, are unicellular algae. The vegetative cells of diatoms are diploid (2n), and hence, they undergo meiosis. Modes of Nutrition # 2. In fact, the composition of the diatom cell walls are biogenic silica. Diatomaceous earth (DE) is a natural product made up of fossilized remains of tiny, aquatic organisms called diatoms. In marine waters the variety of body shapes is much greater. Diatoms produce long-chain fatty acids. In the ocean they form the main part of phytoplankton, the photosynthetic organisms that float with the current. The cell walls of diatoms consists of two thin overlapping shells. Examples are din flagellates, diatoms and euglenoids. Diatoms are non-motile organisms, and therefore the sperms have flagella. Diatoms are a major group of eukaryotic micro algae and are one of the most common types of phytoplankton. We breathe the oxygen that diatoms release. The diatoms in diatomaceous earth are largely made up of a chemical compound called silica. In fact, the cell wall of a diatom is made of silica, the main ingredient of glass. The female cells tend to bend, and create an opening in the cell wall. When the diatoms die, the silica is deposited in the form of diatomaceous earth. The cells produce sexual gametes that fuse to form a zygote. The males produce sperms and females produce eggs. Photosynthetic (Holophytic): In this mode, the organisms prepare their food from CO 2 and water by utilizing sunlight with the help of photosynthetic pigments like chloro­phyll. The CO2 is converted to organic carbon in the form of sugar, and oxygen (O2) is released. The process is called photosynthesis. Such a cell wall allows light to enter the cell. It has a particle size ranging from less than 3 μm to more than 1 mm, but typically 10 to 200 μm. The walls are made up of silica. 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