What happens to a food web if the keystone species is removed?Group of answer choicesThe food web simplifies and there is lower biodiversity.The food web simplifies and there is higher biodiversity.The food web becomes more complex and there is lower biodiversity.The food web becomes more complex and there is higher biodiversity.

What happens when keystone species are removed?*Your answer

Which of the following is the most accurate description of the impact of a keystone species on the surrounding ecosystem?ResponsesA keystone species is a top predator that occupies a large territory and consumes a wide variety of primary consumers in its ecosystemA keystone species is a top predator that occupies a large territory and consumes a wide variety of primary consumers in its ecosystemThe removal of a keystone species would result in increased resource availability for other species in the ecosystemThe removal of a keystone species would result in increased resource availability for other species in the ecosystemThe removal of a keystone species would destabilize the ecosystem in its absenceThe removal of a keystone species would destabilize the ecosystem in its absenceThe addition of a keystone species to an ecosystem would generate more ecological niches for other species to occupy

BIODIVERSITY - Biodiversity is the key to managing environment An ecosystem that retains a high biodiversity (that is, a wide variety of living things) is much more likely to adapt to human-caused environment change than is one that has little. Consider the two food webs shown in the diagram. The arrows point from the organism that gets eaten to the one that eats it. These food webs are highly simplified compared with food webs in real ecosystems, but they still illustrate a key difference between more diverse and less diverse ecosystems. Food web B represents a situation with very low biodiversity, where at some levels the food path involves only a single type of organism. Food web A represents  a more diverse ecosystem with, as a result, many more alternative feeding pathways. Generally, loss of biodiversity should be regarded seriously, not only because the organisms that have become extinct represent a big loss for both ethical and utilitarian (useful benefit) reasons, but also because the organisms that remain have become more vulnerable (exposed) to extinction in the future    13) In lines given above, it is stated that “Food web A represents a more diverse ecosystem with, as a result, many more alternative feeding pathways.” Look at FOOD WEB A. Only two animals in this food web have three direct(immediate) food sources. Which two animals are they?*1 pointNative Cat and Parasitic WaspNative Cat and Butcher BirdParasitic Wasp and SpiderNative Cat and HoneyeaterOption 514) . Food webs A and B are in different locations. Imagine if Leaf Hoppers died out in both locations. Which one of these is the best prediction and explanation for the effect this would have on the food webs?*1 pointThe effect would be greater in food web A because the Parasitic Wasp has only one food source in web A.The effect would be greater in food web A because the Parasitic Wasp has several food sources in web A.The effect would be greater in food web B because the Parasitic Wasp has only one food source in web BThe effect would be greater in food web B because the Parasitic Wasp has several food sources in web B.15) Which of these statements is NOT true?*1 pointAn animal can be located at more than one type of trophic level in a food webThe position of an organism in a food chain is due to its food preferencesUnlike food chains, food webs represent multidirectional transfer of energyFood web is made due to species that occur in more than one food chain16)  Organisms of a higher trophic level which feed on several types of organisms belonging to a number of lower trophic levels constitute*1 pointFood webFood chainEcological pyramidEcosystem

Succession occurs whenMultiple choice question.a keystone species is removed.one species is harmed while another benefits.a chemical becomes more concentrated in organisms at higher levels in the food chain.a community's species composition gradually changes over time.

hat are 'keystone' species in an ecosystem?Answer choicesSelect only one optionREVISITThe species whose elimination can seriously affect the ecosystem.The species whose elimination can benefit the ecosystem.The species whose elimination would not affect the ecosystem.None of the above