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. It belongs to phylum Bacillariophyta. Modes of Nutrition # 2. Composed of the cell walls/shells of single cell diatoms, it easily crumbles to a fine powder. Diatoms produce long-chain fatty acids. Diatomaceous earth (DE) is a natural product made up of fossilized remains of tiny, aquatic organisms called diatoms. The female cells tend to bend, and create an opening in the cell wall. Diatoms can be solitary or live in colonies that might be shaped like long chains, stars or zigzags. Diatoms are eukaryotic organisms belonging to the Kingdom protista. The vegetative cells of diatoms are diploid (2n), and hence, they undergo meiosis. It has a particle size ranging from less than 3 μm to more than 1 mm, but typically 10 to 200 μm. The physical form of the diatom is how scientists classify these organisms. The walls are made up of silica. Diatoms, one of the largest groups of organisms on Earth, are unicellular algae. 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. Diatoms are a major group of eukaryotic micro algae and are one of the most common types of phytoplankton. In the ocean they form the main part of phytoplankton, the photosynthetic organisms that float with the current. Diatoms feed the oceans, lakes and rivers. In fact, the cell wall of a diatom is made of silica, the main ingredient of glass. ə t ə ˌ m eɪ ʃ ə s ˈ ɜːr θ /, DE), diatomite or kieselgur/kieselguhr is a naturally occurring, soft, siliceous sedimentary rock that has been crumbled into a fine white to off-white powder. Scientists estimate there could be as many as 2 million species of diatoms — new species are discovered every year. Because diatoms have a transparent cell wall, you can see the chloroplasts inside the cell. In fresh water most diatoms you will see are of the pennate type. When the diatoms die, the silica is deposited in the form of diatomaceous earth. In marine waters the variety of body shapes is much greater. We breathe the oxygen that diatoms release. The process is called photosynthesis. The diatoms in diatomaceous earth are largely made up of a chemical compound called silica. Most scientists break up diatoms into two major groups: Centrales, the centric diatoms, and Pennales, the pennate diatoms. The cells produce sexual gametes that fuse to form a zygote. In fact, the composition of the diatom cell walls are biogenic silica. The cell walls of diatoms consists of two thin overlapping shells. Modes of Nutrition # 1. Diatomaceous earth (/ ˌ d aɪ. 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