If the answer is not available please wait for a while and a community member will probably answer this ANSWER Viruses spread from person to person mainly in droplets that fly out when you cough or sneeze. Both groups can unknowingly spread the virus to others. However, every STD is not sexually transmitted; they can spread through non-sexual contact also. It’s a philosophical question, but we can agree that either way they can have a huge impact on living things. Class 9 Science Chapter 13 Extra Questions Answers contains all the intext questions as well as exercises questions with suitable answers and explanation. might spread in the air and infect others in the vicinity. The most important ones to humans are the ones that infect us. The virus particles may then either end up on a new potential host or an inanimate object. This is wrapped up in a coat made of protein molecules called a capsid, which protects the genetic material. Unlike other living cells, viruses do not contain the ability to sustain life on their own. 3. Experts estimate there are around 10,000,000,000,000,000,000,000,000,000,000 of them, and if they were all lined up they would stretch from one side of the galaxy to the other. Citing new data that a “significant portion” of people infected with the novel coronavirus can spread the virus … We explain the evidence. It sounded serious, but there was a smiley face at the end of the message. ; For example, the Spanish flu of 1918-1920 infected 500 million people (about ¼ of the Earth’s population at that time) and killed an estimated 50 million people. NCERT Solutions for Class 9 Science Chapter 13 Short Answer Type Questions. Between people who are in close contact with one another (within about 6 feet). The novel coronavirus that causes COVID-19 (yellow) emerging from the surface of cells (blue/pink) cultured in the lab. Today, viruses spread via the internet. However, it does not show what the disease is. Question 9. you knew the answer didn't you? Virus, infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria. A virus that replicates like crazy and kills its host very quickly may not have an opportunity to spread to a new host. In 2003, an outbreak of SARS started in China and spread to other countries before ending in 2004. Learn about the history, types, and features of viruses. The World Health Organization and the U.S. Centers for Disease Control and Prevention (CDC) now include face masks in their recommendations for slowing the spread of the virus. That's because cybercriminals used the phrase to trick computer users into opening what turned out to be a computer virus. A pandemic is an epidemic that has spread over a large region of the world. Therefore, symptoms indicates presence of disease. Bats host many different kinds of coronavirus, one of which is believed to be the source of the novel coronavirus that causes COVID-19. Explain how the virus can be spread.? The viruses generally cannot survive for more than a few hours on surfaces outside a human host, but people can pick up a coronavirus from a contaminated surface for … Meanwhile, scientists are exploring potent… Through respiratory droplets produced when an infected person coughs, sneezes, or talks. Class 9 Science Chapter 13 Important Questions of Why do we fall ill. All the questions are helpful in the preparation of school exams as well as revising the concepts of the chapter. Viruses can mutate and combine with one another. These viruses mutate relatively often in ways that allow them to be transmitted to humans. Much is still unknown, but COVID-19 seems to spread faster than the 2003 SARS and also may cause less severe illness. How much harm a virus or other pathogen can do is often described as its virulence. The name comes from the appearance of the virus particles under a microscope: tiny protein protrusions on their surfaces mean they appear surrounded by a halo-like corona. This illustration shows the shape of a coronavirus particle. You can think of them as nature’s own nanotechnology: molecular machines with sizes on the nanometre scale, equipped to invade the cells of other organisms and hijack them to reproduce themselves. The ''ILOVEYOU'' virus as it came to be known wrote over users' system and persona… Individuals can also be infected from and touching surfaces contaminated with the virus and touching their face (e.g., eyes, nose, mouth). Viruses are like predators with a specific prey they can recognise and attack. What’s the difference between COVID-19 and the flu? 4. Viruses that do not recognise our cells will be harmless, and some others will infect us but will have no consequences for our health. (CCE 2012) Answer: Contaminated needles, syringes and tatooing. Such changes are called symptoms. By continuing, I agree that I am at least 13 years old and have read and While the great majority are harmless to humans, some can make you sick and some can even be deadly. Mostly through air,water,land , touch,contact. Confirmation is by laboratory testing to detect the virus's RNA, antibodies for the virus, or the virus itself in cell culture. Food or water that’s been contaminated by feces can spread the virus to others. The virion can “survive” in the environment for a certain period of time, which means it remains structurally intact and is capable of infecting a suitable organism if one comes into contact. This discussion on Explain how the virus can be spread.? Question bank for Class 9. The World Health Organization (WHO) has declared this rapidly spreading coronavirus outbreak a pandemic, and countries around the world are grappling with a surge in confirmed cases. Blood transfusion from infected person. Answers of Explain how the virus can be spread.? The hefty droplets fly from a person's mouth when they cough or sneeze, falling to the ground by the time they’ve traveled only a few feet. On the other hand, a virus that replicates slowly and causes little harm may have plenty of time to spread. community of Class 9. 9 Signs It's More Serious Than the Common Cold Doctors explain how to tell if you have a head cold or something more serious that … Viruses can be passed from one person to another by shaking hands, touching food, through water, or through the air when a person coughs or sneezes. That’s one reason washing your hands with soap is so effective! The first case was identified in Wuhan, China, in December 2019.It has since spread worldwide, leading to an ongoing pandemic.. What could be better than receiving an email with the subject line, ''I love you?''' COVID-19 may be spread by people who are not showing symptoms. The virus is transmitted through direct contact with respiratory droplets of an infected person (generated through coughing and sneezing). The coronavirus that causes COVID-19 is one of these these “enveloped” viruses. Apart from sexual contact, AIDS virus can be spread by which other means ? The virions make their way out of the cell, usually destroying it in the process, and then head off to infect more cells. Diagnosis based on symptoms is difficult. Soap can dissolve this fatty envelope, leading to the destruction of the whole virus particle. is done on EduRev Study Group by Class 9 Students. HIV (Human immunodeficiency virus) that causes AIDS comes into the body via., the sexual organs or any other means like blood transfusion will spread^to lymph nodes all over the body. In 2019, a new coronavirus was identified as the cause of a disease outbreak that originated in China. In the US, social distancing to slow the spread of coronavirus has created a new normal. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. COVID-19 is caused by the SARS-CoV-2 virus, which spreads between people, mainly when an infected person is in close contact with another person. However, mounting evidence suggests that aeros… When a living thing is exposed to a virus, the virus … Write an article and join a growing community of more than 120,300 academics and researchers from 3,879 institutions. This discussion on Explain how the virus can be spread.? HIV—Human Immuno Deficiency Virus. Sometimes, as in the case of COVID-19, that means they can switch species. The virus damages the immune system of the body and due to this the body can no longer fight off many minor infections. Although invisible, the water in a few of the cups has already be tainted with the "virus" (sodium carbonate). The infectious diseases are spread in the following ways: When an infected person sneezes or coughs, the droplets containing the pathogen of diseases such as influenza, common cold, etc. Viruses can also be passed on by insect bites, animals, or through bad food. Symptoms of COVID-19 are variable, but often include fever, cough, fatigue, breathing difficulties, and loss of … In other words they cannot function outside a host organism, which is why they are often regarded as non-living. Disease is a state in which, body or organs of body show variation. Students simulate the spread of a virus such as HIV through a population by "sharing" (but not drinking) the water in a plastic cup with several classmates. Viruses are the most common biological entities on Earth. CDC / Alissa Eckert, MS; Dan Higgins, MAM. The rapid spread of the virus that causes COVID-19 has sparked alarm worldwide. Bacteria also have unique viruses called bacteriophages, which in some cases can be used to fight bacterial infections. Apart from being the largest Class 9 community, EduRev has the largest solved Does this “life cycle” make viruses alive? Becoming exposed to or infected with an infectious microbe does not necessarily mean developing noticeable disease. Associate Professor Lotti Tajouri is affiliated with Dubai Police Scientist Council. This depends not only on how much harm it does to an infected person, but also on how well the virus can avoid the body’s defences, replicate itself and spread to other carriers. 2. The virus is now known as the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). When millions of people clicked on the document, a virus called Meliss… On March 26, 1999, millions of people around the world opened an email they thought was from a friend or colleague. Many animal and plant species have their own viruses. Outside a cell, a virus it wraps itself up into an independent particle called a virion. The coronavirus COVID-19 is a member of the virus family coronaviridae, or coronaviruses. Coronavirus disease 2019 (COVID-19) is a contagious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The virus is thought to spread mainly from person-to-person. Computer Virus - Computer Security & Virus, Computer Awareness, RD Sharma Solutions for Class 9 Mathematics, English Grammar (Communicative) Interact In English- Class 9, Class 9 Physics, Chemistry & Biology Tips & Tricks. is done on EduRev Study Group by Class 9 Students. Other coronaviruses were responsible for deadly outbreaks of Serious Acute Respiratory Syndrome (SARS) in China in 2003 and Middle East Respiratory Syndrome (MERS) from 2012. You can still spread the virus You can transmit, or pass on, the SARS-CoV-2 virus before you have any symptoms. over here on EduRev! Class 9 Science Chapter 13 Why do we fall ill? These discoveries led public health groups to do an about-face on face masks. Question 10. Viruses possess unique infective properties and thus often cause disease in host organisms. These contaminated objects are known as fomites, and can play an important role in the spread of disease. Tuberculosis is a dangerous bacterial infection that attacks your lungs. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Once a person is infected with a virus, their body becomes a reservoir of virus particles which can be released in bodily fluids – such as by coughing and sneezing – or by shedding skin or in some cases even touching surfaces. In order to survive, they must find a host cell, outside of which a virus can neither function nor survive. In comparison, SARS-CoV was mainly only infectious days after symptoms began. The World Health Organization still statesthat COVID-19 spreads mostly through direct contact with infected people and with infected large respiratory droplets, which measure more than 0.0002 inches in diameter. How many squares can be formed on a chessboard ? In most cases, applications that have been infected by virus code are transferred from computer to computer just like any other application. Coronaviruses are a family of viruses that can cause illnesses such as the common cold, severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS). Learn more about how it’s spread, who’s at risk, symptoms, treatment, and prevention. Gastrointestinal viruses are shed in the stool during bowel movements. The virus can spread from an infected person’s mouth or nose in small liquid particles when they cough, sneeze, speak, sing or breathe heavily. 1. agree to the. Some families of viruses, such as herpes viruses, can stay dormant in the body for long periods of time without causing negative effects. The disease it causes i… Viruses rely on the cells of other organisms to survive and reproduce, because they can’t capture or store energy themselves. This means getting a flu vaccine during 2020-2021 is … At the core of a virus particle is the genome, the long molecule made of DNA or RNA that contains the genetic instructions for reproducing the virus. Other conditions that may present similarly include Ebola, malaria, typhoid fever, and yellow fever. Well, if you were the recipient of such an email in the early 2000s, you might not have been so happy. Cats have the feline immunodeficiency virus or FIV, a cat version of HIV, which causes AIDS in humans. Acute diseases Non-contact modes include transfusion of contaminated blood and tissue, breastfeeding, sharing of syringes, etc. Some viruses also have an outer envelope made of lipids, which are fatty organic molecules. are solved by group of students and teacher of Class 9, which is also the largest student community of Class 9. You can study other questions, MCQs, videos and tests for Class 9 on EduRev and even discuss your questions like These droplets can land in the mouths or noses of people who are nearby or possibly be inhaled into the lungs. Associate Professor, Biomedical Sciences, Bond University. Diseases can be either acute or chronic. The email was one short sentence suggesting there was a private document for the viewer's eyes only. The virus particles may then either end up on a new potential host or an inanimate object. These contaminated objects are known as fomites, and can play an important role in the spread of disease. It’s likely that flu viruses and the virus that causes COVID-19 will both spread this fall and winter. The Questions and The subject line read, 'important message.' If you're seeing this message, it means we're having trouble loading external resources on our website. soon. Healthcare systems could be overwhelmed treating both patients with flu and patients with COVID-19. Bond University provides funding as a member of The Conversation AU. Spread can then occur via direct contact between people. In evolutionary terms, there is often a trade-off for a virus between replicating and doing harm to the host. Copyright © 2010–2021, The Conversation US, Inc. NIAID Rocky Mountain Laboratories (RML), U.S. NIH. A person is suffering from chest pain, breathlessness, loss of body weight, persistent cough and produces stained sputum. Explain. The structure of a virus and how it infects a cell. The virus that causes COVID-19 is similar to the one that caused the 2003 SARS outbreak: both are types of coronaviruses. Once inside, the virus “hacks” the cell to produce more virions. The Questions and Answers of Explain how the virus can be spread.? STDs like AIDS can be passed from the mother to her child during birth, or after birth through breastfeeding. When a virion attaches to a suitable host cell – this depends on the protein molecules on the surfaces of the virion and the cell – it is able to penetrate the cell. are solved by group of students and teacher of Class 9, which is also the largest student Through bad food how many squares can be spread. transmitted through direct contact between.. 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Identified as the cause of a coronavirus particle, explain how the virus can be spread class 9, typhoid fever, and features viruses! Known as fomites, and can play an important role in the case of COVID-19, that means they have. 2 ( SARS-CoV-2 ) how many squares can be spread. virus called Meliss… Mostly through air water! On living things occur via direct contact between people virus damages the immune of... Store energy themselves at the end of the virus “hacks” the cell to more! Millions of people clicked on the cells of animals, or after through... The source of the message a community member will probably Answer this soon overwhelmed treating both patients with and. 2000S, you might not have been infected by virus code are transferred computer.

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