a) Species require broader ecological tolerances to survive the harsher conditions of high latitudes. Analyze changes in population sizes and biodiversity resulting from natural causes, changes in climate, human activity, or introduction of a non-native species. How does the current rate of Extinction compared to the background Extinction rate? Interactions between two or more of these drivers increase the pace of biodiversity loss. Ask your question Login with google. The world is full of different and biologically diverse ecosystems, each providing its own set of values and uniqueness. Human action has triggered a vast cascade of environmental problems that now threaten the continued ability of both natural and human systems to flourish. As human populations grow, the terrestrial and aquatic ecosystems they use may be transformed by the efforts of human beings to find and produce food, adapt the landscape to human settlement, and create opportunities for trading with other communities for the purposes of building wealth. Traditionally, ecologists have measured biodiversity, a general term for the number of species present in the biosphere, by taking into account both the number of species and their relative abundance to each other.Biodiversity can be estimated at a number of levels of organization of living organisms. Our editors will review what you’ve submitted and determine whether to revise the article. Let's see if you can get them right or not. Environmental Value 2. The primary drivers of biodiversity loss are influenced by the exponential growth of the human population, increased consumption as people strive for more affluent lifestyles, and reduced resource efficiency. 1. 6. Convention on Biological Diversity, also called Biodiversity Treaty, international treaty designed to promote the conservation of biodiversity and to ensure the sustainable use and equitable sharing of genetic resources. ecosystem is healthy when it has a variety of species? C. As land is cleared for grazing, valuable topsoil can wash away more easily. adminstaff. Likewise, biodiversity loss describes the decline in the number, genetic variability, and variety of species, and the biological communities in a given area. forces and motion Biodiversity, or biological diversity, is a term that refers to the number of genes, species, individual organisms within a given species, and biological communities within a defined geographic area, ranging from the smallest ecosystem to the global biosphere. Seasonal changes, such as the onset of spring, create opportunities for feeding and breeding, increasing biodiversity as the populations of many species rise. a temperate forest with average biodiversity that loses many types of trees due to a fire. Economic Value 5. Ecological diversity . Cause #6 Introduction of Exotic Species: Any species which is not a natural inhabitant of the locality … Biodiversity and its conservation Questions: MCQs Test - 01, Total Questions 15 Which of the following environments would you expect to have the most biodiversity? (a) Food: A large number of wild plants are consumed by human beings as food. Consumptive use Value: These are direct use values where the biodiversity products can be harvested and consumed directly e.g. Declines in genetic diversity that accompany rapid falls in population may increase inbreeding (mating between closely related individuals), which could produce a further decline in genetic diversity. Biodiversity provides numerous direct and indirect service to human beings. Which of the following statements explains portability in non-functional requirements? Biology. Species diversity: It refers to the variety of species within a region. While Earth’s biodiversity is so rich that many species have yet to be discovered, many species are being threatened with extinction due to human activities, putting the Earth’s magnificent biodiversity at … SCI COMMUN> “Neanderthals … are resilient, resourceful. Biodiversity is the part of nature which includes the difference in genes among the individuals of a species, the variety and richness of all the plant and animal species at different scales in space, locally in a region, in the country and the world and various types of … While Earth’s biodiversity is so rich that many species have yet to be discovered, many species are being threatened with extinction due to human activities, putting the Earth’s magnificent biodiversity at risk. Agricultural biodiversity is the outcome of the interactions among genetic resources, the environment and the management systems and practices used by farmers. Sudden population declines may upset social structures in some species, which may keep surviving males and females from finding mates, which may then produce further population declines. Solving the critical environmental problems of global warming, water scarcity, pollution, and biodiversity loss are perhaps the greatest challenges of the 21st century. The planet's biomass is classified by kingdom of life and other major groupings, and the size of each group's relative footprint is displayed using gigatons of carbon as the common measure. Get a Britannica Premium subscription and gain access to exclusive content. These changes may also provide new opportunities for invasive species, which could further add to the stresses on species struggling to adapt to changing environmental conditions. The most important of them are 1. However, associating biodiversity loss with species loss alone overlooks other subtle phenomena that threaten long-term ecosystem health. Many ecologist support the idea that more diverse ecosystems could be less affected by major environmental change the in Last of Us ecosystems. 21. As forests are managed for sustainability, some tree species may be lost. 3. (1) Tropical latitudes receive more solar energy than temperate regions, which leads to high productivity and high species diversity. More diverse ecosystems have a broader mix of species, including some that are more likely to be able to tolerate changes such as drought, floods, or other extreme environmental events. These birds survive and produce Offspring with large beaks. 1. Evolution and Biodiversity Test Review DRAFT. Habitat loss combined with hunting pressure is hastening the decline of several well-known species, such as the Bornean orangutan (Pongo pygmaeus), which could become extinct by the middle of the 21st century. Please select which sections you would like to print: While every effort has been made to follow citation style rules, there may be some discrepancies. Answers Mine. (a) … Which of the following is an example of alien species invading a new ecosystem resulting in biodiversity ... (ii) Loss of habitat and fragmentation, considered to be the major cause of loss of biodiversity? Which of the following statements explains why diversity actually makes good business sense? Download png. Will we rise to meet them? This massive conversion of forests, wetlands, grasslands, and other terrestrial ecosystems has produced a 60 percent decline (on average) in the number of vertebrates worldwide since 1970, with the greatest losses in vertebrate populations occurring in freshwater habitats (83 percent) and in South and Central America (89 percent). ; Biodiversity forms the foundation of the vast array of ecosystem services that critically contribute to human well-being. Biodiversity refers to the variety of living species on Earth, including plants, animals, bacteria, and fungi. If the niches filled by a single species or a group of species are critical to the proper functioning of the ecosystem, a sudden decline in numbers may produce significant changes in the ecosystem’s structure. a. Humans (Homo sapiens), their crops, and their food animals take up an increasing share of Earth’s land area. 7. 1 Answers. 1! D. As trees are cut down, less water vapor is released into the atmosphere. There are three levels of biodiversity: 1. Can you explain this answer? Identify it. Biodiversity is typically a measure of variation at the genetic, species, and ecosystem level. Some species may not able to cope with environmental changes from global warming. Aesthetic Value. Which of the following statements is true? The Areas guide provides short articles about selected areas of importance for biodiversity conservation. As forests are managed for sustainability, some tree species may be lost. But environmental organisations believe that even exploratory drilling would be a serious blow to the rich biodiversity of the region. What is the snake an example of in the food chain given below? 2. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. A Small Mouse population found in the Front Range of Colorado looks and acts very much like other mice in the area yet, this particular group of mice is thought by many to deserve protection under the US Endangered Species Act. Middle School. To date, the most significant causes of extinction are habitat loss, introduction of exotic species, and overharvesting. Researchers estimate that the current rate of species loss varies between 100 and 10,000 times the background extinction rate (which is roughly one to five species per year when the entire fossil record is considered). What would you need to know to estimate when a fossilized fish lived, the characteristics of the rock in which the fossil was found, Evolutionarily speaking, which of the following groups of organisms appeared most recently, What major impacts of photosynthetic bacteria have on Earth's atmosphere, They began to produce oxygen which accumulate in the atmosphere, Domain Eukarya includes all of the following except, If there were a hundred million species on Earth, how many species might be reasonably predict to become extinct annually assuming background Extinction rates, Mass extinction events are characterized by The Disappearance of 20% of the _____ in the fossil record, The fossil record indicates the occurrence of how many mass extinction events, Today's Global Extinction rate is _____ times greater than Earth's background Extinction rate, Which of the following groups of organisms has the greatest percent of species at risk of Extinction today, A species classified as ____ by the IUCN is likely to become endangered unless threats to its existence or reduced, I threatened habitat that has high levels of species diversity and a large number of endemic species, All the following are major causes of biodiversity loss except, Which of the following is the major cause of biodiversity loss on land, Which of the following is the major cause of biodiversity loss in Earth's oceans, Which of the following roles do plants play in an intact ecosystem, Plants provide Energy ecosystems in the form of sugars, Which of the following accurately describes current trends in biodiversity and crop production, Crop diversity has declined, as have populations of pollinators needed to pollinate our crops, Which of the following statements about biodiversity is true, Use of only a handful of species for the vast majority of our crops has made our food supply more vulnerable to pests and disease, Which of the following statements regarding the benefits of biodiversity is true, Traditional cost and benefit analysis of economic activity largely ignore the benefits of ecosystems and biodiversity, and therefore Global ecosystems and biodiversity are in serious peril, How is it possible that we don't currently know how many species are present on Earth.
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