![]() Because of the high concentration of photosynthetic accessory pigments, red tides are generated by a sudden, often dangerous growth of marine phytoplankton, particularly dinoflagellates, which color the seared, brown, or yellowish. Agricultural fertilizers, which are leached - into water systems from the soil, or sewage effluent could be the source of increasing nitrate. A rise in nitrate levels, a mineral ion required for algal and bacterial growth, causes algal blooms. The creatures’ density may prevent light from reaching lower depths in the water body. ![]() Find out what do the terms ‘algal bloom’ and ‘red tides’ signify?Īns: An algal bloom is a fast growth in populations of algae and other phytoplankton, particularly cyanobacteria, in organically rich water bodies. It may extend for hundreds of meters in some regions, from which it can be mined.Ĥ. They generate large mounds of diatomite or diatomaceous earth at the bottom of water reservoirs. Diatoms' siliceous frustules are resistant to degradation. Fine patterns, pits, pores, and ridges can be found on the outer layer. Epitheca refers to the upper half (lid), whereas hypotheca refers to the lower half (case). It is made up of two overlapping halves (or theca) that fit together like the two halves of a soapbox or a petri dish. The cell wall is primarily made up of cellulose that has been impregnated with glass, similar to silica. What is the nature of cell walls in diatoms?Īns: Diatoms' cell walls are known as frustules. Pseudomonas, Xanthomonas, and other bacteria are utilized in the production of serum, vaccines, vitamins, enzymes, antibiotics, and other products.Īrchaebacteria are used to produce gobar gas from manure and sewage, and they cause cellulose fermentation in ruminants.Īrchaebacteria can be found in the guts of ruminants like cows and buffaloes, and they aid in digestion.ģ. Symbiotic bacteria aid in nitrogen-fixing in the atmosphere.īacteria are used in the manufacturing of lactic acid, curd, cheese, butter, vinegar, and other industrial products. They also assist with sewage disposal, manure production, and other tasks. (a) Heterotrophic bacteria (b) ArchaebacteriaĪns: Some heterotrophic bacteria are decomposers they are used as natural scavengers, decomposing dead bodies and organic wastes to release raw resources, allowing organic matter to be reused. State two economically important uses of: It uses cytotaxonomy, chemotaxonomy, numerical taxonomy, and cladistic taxonomy to classify organisms.Ģ. Following that, creatures were categorized using a phylogenetic framework based on evolutionary links. Morphology, anatomy, physiology, reproduction, ontogeny, cytochemistry, and other factors were used to classify organisms back then. Aquatic (fish, whales), terrestrial (reptiles, cattle), and aerial (birds) are examples (e.g., bat, birds). Previously, Aristotle developed an artificial classification system that classified animals and plants according to their habitat. Scientists have developed various classification systems, which have undergone several revisions over time. Discuss how classification systems have undergone several changes over some time?Īns: Biological categorization is the scientific method of grouping organisms into hierarchical groups and subgroups based on their similarities and differences. If instead you fuse very light nuclei to get bigger products, energy is again released because the nucleons in the products are more tightly bound than in the original nuclei.1. Thus, if you split a nucleus that is much larger than iron into smaller fragments, you will release energy because the smaller fragments are at a lower energy than the original nucleus. It turns out that the most tightly bound atomic nuclei are around the size of iron-56. If a nuclear reaction produces nuclei that are more tightly bound than the originals, then the excess energy will be released. The key is in how tightly the nucleons are held together in a nucleus. Nuclear fission is a process in which a nucleus splits into two smaller nuclei. Nuclear fusion is a process in which two nuclei join to form a larger nucleus. Fusion and fission are similar in that they both release large amounts of energy.
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