Beetle Spider A Spider B Spider C Leafhopper Bug Beetle Herbs Bug Competition fo
ID: 118192 • Letter: B
Question
Beetle Spider A Spider B Spider C Leafhopper Bug Beetle Herbs Bug Competition for food among herbivorous insects Meadow food web Q1.9. Imagine all the Grasshoppers are removed and excluded from a large area of the meadow ecosystem. Which of the following predictions is LEAST likely to occur, according to the diagrams? Spider B will go extinct. The Spider C population size will decrease The Beetle population size will increase The diagrams indicate that all of the above are equally likely Q1.10. According to both diagrams, the extinction of which one of the spider species would likely have a much bigger impact on community structure than the extinction of any one of the others? Spider A Spider B SpiderExplanation / Answer
Q1. 9.
Answer - Spider B will go extinct is the least likely possibilty.
Spider B feeds on Beetles, Leafhoppers and Grasshoppers. Therefore reduction in Grasshopper population will not have a drastic impact on Spider B population. Its extinction in such a scenario is highly unllikely.
Spider C population size may decrease if it feeds greatly on grasshoppers compared to its other feed sources viz., Bugs and Beetles. Hence it is a likely possibility.
The Beetle population size may increase. With Grasshopper out of the competition, Beetles may proliferate on herbs and increase their numbers. Hence this too is a likely possibility
Q1.10.
Answer - Spider C extinction will have a much bigger impact on community structure than any other species. This is because this is the only spider species that preys on grasshopper. If Spider C is gone, the grasshopper population will increase. This will create competition among herb eaters like Beetles, Bugs and Leafhoppers. Their numbers may eventually reduce drastically to impact the food web.
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