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BIO205 Exam Review Already Rated A+ Which of the following is a completely non-random process of evolution? a. mutation b. genetic drift c. natural selection d. bottleneck e. founder effect ️c. natural selection (T/F) Both a mixed deciduous forest and a healthy tree are dynamic stea...

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  • October 20, 2024
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BIO205 Exam Review Already Rated A+

Which of the following is a completely non-random process of evolution?

a. mutation

b. genetic drift

c. natural selection

d. bottleneck

e. founder effect ✔️c. natural selection



(T/F) Both a mixed deciduous forest and a healthy tree are dynamic steady states ✔️True



It is advantageous for lemurs to have a bigger tail. What type of selection is this? ✔️Directional



What type of selection did the Grant's find when they noticed a microevolutionary change in beak size
of finches after severe drought? ✔️Directional selection



Which is an example of a behavioural adaptation?

a. bright colour of butterfly indicates toxicity

b. chemicals made by plants kill off neighbouring plants

c. mating displays of birds of paradise

d. muted feather colours of female robin ✔️c. mating displays



2 species of butterflies live in the same habitat/geographic location but one is found in the late spring,
while the other is only found in the early autumn. What type of reproduction barrier is this?
✔️Prezygotic - they can't even attempt to fertilize



A small, herbaceous plant grows in the cracks of a sidewalk. Individuals are pulled and mowed by
humans. What life history strategy does this represent? ✔️Annual

,Would a population experiencing high rates of adult mortality evolve to reach sexual maturity earlier or
later in life? ✔️Earlier



In its early years, an organism with a long life expectancy and determinate growth should favour:



a. growth over offspring production; age of sexual maturity will also occur in early years

b. offspring production over growth; age of sexual maturity will be delayed to later years

c. offspring production over growth; age of sexual maturity will occur in early years

d. growth over offspring production; age of sexual maturity will be delayed to later years ✔️d. growth
over offspring production; age of sexual maturity will be delayed to later years



An environment with low rates of disturbance but unfavourable abiotic conditions should favour plants
that:



a. reach maturity quickly

b. have low seed investment

c. grow quickly

d. are short lived ✔️b. have low seed investment



(this is characteristic of most perennial plants; as you can see in the question, a plant that lives in low
disturbance but harsh abiotic conditions will be a perennial and so it does not fit with the other
characteristics of annual plants such as reaching maturity quickly, growing quickly, or being short lived)



Which is true regarding ecological niches?

a. the fundamental niche encompasses a larger geographic range than the realized niche

b. the realized niche encompasses a larger geographical range than the fundamental niche ✔️a. the
fundamental niche encompasses a larger geographical range than the realized niche



What type of dispersal pattern would be shown by an organism that lives exclusively in the carcasses of
decomposing animals? ✔️a. clustered

, The ecological envelope is most similar to what niche? ✔️realized



When performing a mark-recapture experiment, if no marked individuals are recaptured the second
time, the equation will

a. estimate the population at 1

b. estimate the population to be infinitely large

c. estimate the population to be equal to the total number of individuals marked in the initial capture

d. be undefined

e. estimate the population to be zero ✔️d. be undefined



A tree only reproduces in the early spring. What type of growth model would demonstrate this
reproductive strategy? ✔️Geometric, because the reproductive events happen in discrete annual time
intervals



What type of survivorship curve would represent a tree that produces thousands of seedlings, but only a
few of which make it to adulthood? ✔️Type III



Which of the following is not a measure of population density?

a. 9 bark beetle colonies per square km

b. 23 oak trees per square hectare

c. 17.3 dandelions per square m

d. 1200 bacteria per cubic mm ✔️a. 9 bark beetle colonies per square km - this is incorrect because
population density measures individuals within a population, and colonies would likely fit more into a
community setting



Species of aquatic gastropods can use different reproductive strategies. Some species produce large
numbers of small eggs that hatch at an early stage of development. Other species produce few eggs that
are retained for a longer time within the body of the mother and hatch at an advanced stage of
development. If an equal number of adults of both species existing in the same area over many
generations is discovered, which is most likely?

a. young that experience greater parental investment have a greater chance of survival

b. additional offspring do not result in a larger population as the carrying capacity has been reached

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