Bio220 Midterm |309 Questions| With Correct Answers.

what does bottlenecks and selection do to population {Ans: reduce effective population size (Ne)}when are we going to exit current interglacial period {Ans: in next 10-50 thousand years}carbon cycle and trophic webs {Ans: connects all trophic webs together}nitrogen cycle -- slow or fast {Ans: fast}where are pikas normally found, what is lethal temp {Ans: high, cold mountains - lethal: 27 degrees}how is p lost from ecosystems {Ans: runoff, erosion, over application of fertilizers, eutrophication}what makes seeds/tubers good {Ans: they were energy storage organs - built in necessary carbs and starches}LECTURE 5: ecology and evolution of harvested populations {Ans: }LECTURE 2 {Ans: }is po4 3- soluble {Ans: technically yes, but can be bound by soil components - mycorrhizal fungi can pull it into solution so plant roots can get it, often inaccessible to plants}why does selection favor smaller size {Ans: due to fishing pressure}world has lost how much of forest since last ice age {Ans: 1/3 - almost half of world's habitable land is used for agriculture}plant allocations favored in nature vs modern (3) {Ans: - grow tall to compete for light, enhance pollination, seed dispersal VS competition