Bio 182 Exam 3 Review Questions With Complete Solutions

The atmosphere is changing because: correct answer: carbon is being added faster than it is removed exponential growth curve correct answer: j-shaped curve showing the rapid increase in an exponentially growing population There are 1000 rabbits in a population that grows 10% per month. How many rabbits would you have after 120 months? correct answer: General Formula (exponential growth--no limit) Pop=(population)(growth rate)^number of months At 0 months, start with 1000 rabbits. At 1 month, you have 1000 rabbits plus the 10%, so multiply by 1.1, and each month multiply by 1.1. By, 120 months --> Population=(1000)(1.1)^120 Population=92,709,068 rabbits General formula for exponential growth correct answer: Pop=(population)(growth rate)^number of months Difference between exponential growth and logistic growth correct answer: Exponential growth: When resources are unlimited, populations exhibit exponential growth, resulting in J-shaped curve Logistic growth: Population expansion decreases as resources become scarce; population levels off when carrying capacity of environment is reached, resulting in an S-shaped curve Define population correct answer: Dr. Plowes Video: "A group of organisms of the same species that inhabit a designated location. Ex. Coyotes that inhabit south mountain; or the students of Bio 182 that are online" Define community correct answer: Dr. Plowes Video: "Multiple species that interact and are found in the same location. Ex. Human body is a community; pores and eyelashes, have demodex mites that live there; bacteria that live in digestive system. Can have interactions that don't negatively affect the players, sometimes they're mutually beneficial interactions, and sometimes one of the players benefits and the other one doesn't" Sampling Quadrats correct answer: Count individuals in a few small areas and extrapolate to the whole area. Scientists find random places to place quadrats to get samplings and estimate population size. The more quadrats, the more representative of the population. Mark and Recapture correct answer: Capture, mark, and release individuals. Then resample and use proportion of marked individuals to infer the total population. In a large population, when you recapture, you should have a mix of marked and unmarked. If you maybe marked 10% of the population the 1st time, then when you captured them the 2nd time, then you should expect that only 10% of the recaptured should be marked. Mark and Recapture Math correct answer: # Marked 1st time = # Marked 2nd time________ Population Size Total Captured 2nd time Assuming that the animals are not afraid of the scientists for capturing and marking them... True/False Sampling quadrats would be the better method for estimating the number of whales in a population. correct ans