Biology Notes for UPSC IAS Prelims (Part I). This (electrical) impulse, which travels from the dendrite tip to the cell body, and then along the axon to its end of the axon, sets off the release of some chemicals. Similar usage prevails in mathematics, 0. Biological control (biocontrol) is the use of one biological species to reduce populations of a different species. An experiment where all subjects involved in the experiment are treated exactly the same except for one deviation is an example of a control experiment. The people in the control group act as a control set-up. Eutrophication: Definition, Causes, Impacts and Control Strategies. In biology, a controlled experiment often includes restricting the environment of the organism being studied. The word ‘eutrophication’ actually comes from a Greek word meaning excessive feeding. Biology definition, the science of life or living matter in all its forms and phenomena, especially with reference to origin, growth, reproduction, structure, and behavior. How to use biological control in a sentence. Control definition is - to exercise restraining or directing influence over : regulate. Control group definition, (in an experiment or clinical trial) a group of subjects closely resembling the treatment group in many demographic variables but not receiving the active medication or factor under study and thereby serving as a comparison group when treatment results are evaluated. control gene: a gene with the function of activating the production of messenger RNA by one or more adjacent structural loci. This is necessary to minimize the random effects of the environment and the many variables that … In biology, epigenetics is the study of heritable phenotype changes that do not involve alterations in the DNA sequence. Control Mechanisms - Biology Encyclopedia; Control Mechanisms Photo by: Sven Kamin. When brain gives command, muscle moves – it happens because muscle cells have special proteins that change both their (muscle’s) shape and arrangement in the cell in response to nervous electrical impulses. Also called, (Biology) the control of destructive organisms by the use of other organisms, such as the natural predators of the pests, the control of pests by interference with their ecological status, as by introducing a natural enemy or a pathogen into the environment. Internal environment refers the interstitial fluids surrounding individual cells while external environment refers to the environment … This is the British English definition of biological control. Homeostasis-Control System. See more. A biological control is the use of organism (s) to control the population of another group of organisms. How to use control in a sentence. They do not receive the factor or active medication that the people do in the experimental group, which acts as the experimental setup. If parthenium has just arrived, regulators should facilitate the registration and promotion of, HYDERABAD -- Viewing the ever-rising mosquito population as a threat to the human health, experts have suggested taking advantage of certain fish species as a method of ', japonicus entered North America, but genetic data indicate that the parasitoid did not escape from quarantine facilities where it is being studied as a potential classical, The suitability of entomopathogenic nematodes as, Kenya will borrow from Brazil on the use of, Addressing duck distribution ceremonies, Director Livestock Rawalpindi Ghulam Hussain Bhutta said the duck raising was not only helpful for the economic empowerment of rural women, but it could also be helpful in the, The spiders belongs to order Araneae are very robust and potent predators and they are also important, But for plums, the extent of the natural flora's potential for, The national BMSB research team will be aided in its planning for deployment and evaluation of a, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content, CABI publishes recommendations to fight scourge of parthenium weed in Central West Asia, Breed fish to eliminate mosquito population, First report of Trissolcus japonicus parasitizing Halyomorpha halys in North American agriculture, BFAR runs out of mosquito fish to fight dengue, Comparing the Productivity of Five Entomopathogenic Nematodes in Galleria mellonella, 200 units of ducks distributed among poor women, ARGIOPE BILALI, A NEW SPECIES OF (ARANEIDAE, ARACHNIDA) BUGS FORM DISTRICT DADU, SINDH (SHORT COMMUNICATION), HISTORICAL PROSPECTS AND IMPORTANCE OF BIOLOGICAL CONTROL, Naturally occurring yeasts offer pathogenic protection for fruits, Seeking out stink bugs in Southern California: using citizen scientists to learn more about stink bug diversity, behavior and distribution, and track the spread of the invasive Brown Marmorated Stink Bug (Halyomorpha halys), Biological Collection Access Service for Europe, Biological Collection Information Service for Europe, Biological Control of Insects Research Laboratory, Biological Control of Pests Research Unit, Biological Data Management and Technology Center. The presence of a control group helps scientists rule out alternate causes for any observed results. They are used to compare the test results. A controlled experiment can use a control group or a controlled setup, but is designed so that only one variable is … the light on the specimen. All information, coming from our environment is detected by the specialized tips of some nerve cells, which are usually located in sense organs. n. (Biology) the control of destructive organisms by the use of other organisms, such as the natural predators of the pests. In multicellular organisms, following the general principles of body organization, some specialized tissues are used to provide the control and coordination activities. birth control. group of subject that receive no treatment or a standardized treatment Feedback, in biology, a response within a system (molecule, cell, organism, or population) that influences the continued activity or productivity of that system. The brain is categorized into three major parts or regions, namely the fore-brain, mid-brain, and hind-brain. Homeostasis is a physiological process of a body to maintain constant internal environment in response to fluctuations in outer external environment. This isolates the independent variable's effects on the experiment and can help rule out alternative explanations of the experimental results. The definition of a control experiment is a test where the person conducting the test only changes one variable at a time in order to isolate the results. Field Diaphragm Control - The base of the microscope contains the field diaphragm. The communication between the central nervous system and the other parts of the body is established by the peripheral nervous system. The cell possesses an extraordinary array of enzymes , each specialized to carry out an important function in the cell. biological control When using the scientific method to solve a problem or question, one formulates an educated guess or hypothesis which is a possible answer to the problem or question. 1. A control variable is any factor that is controlled or held constant during an experiment. “ Birth control includes a variety of devices and procedures by which conception can be prevented. The control subjects are those individuals that don't get access to whatever is being tested. There has been a substantial increase in commercialization of biocontrol products, such as beneficial insects, cultivated predators and natural or non-toxic pest control products. In essence, it is the control of a biological reaction by the end products of that reaction. Biological control definition is - the reduction in numbers or elimination of pest organisms by interference with their ecology (as by the introduction of parasites or diseases). Nervous system is specialized system that provide control and coordination in animals. Among these three parts (of the brain), fore-brain is the main thinking part of the brain; further, fore-brain are specialized for hearing, smell, sight, etc. The Greek prefix epi-(ἐπι-"over, outside of, around") in epigenetics implies features that are "on top of" or "in addition to" the traditional genetic basis for inheritance. The negative control group is a group in which no response is expected. However, in many cases it is critical that the enzymes only be active at certain times and not others. These chemicals cross the gap, or synapse, and create a similar electrical impulse in a dendrite of the next neuron (see the image given below). This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. Many classical biological control programs for insect pests and weeds are under way across the United States and Canada. Biological control or biocontrol is a method of controlling pests such as insects, mites, weeds and plant diseases using other organisms. One major type of control subject is the positive control. This controls the size of the illuminated field. The information, acquired at the end of the dendritic tip (shown in the image given below) of a nerve cell, sets off a chemical reaction that creates an electrical impulse. ‘These control experiments confirmed that the antibody penetrated well in all the samples studied.’ ‘Total absence of care or health services cannot be considered a suitable control standard.’ Synonym Discussion of control. 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