Ecology - Organisms & Population Questions and Answers

Drag and drop the labels into the correct empty boxes to complete the concept map biofilm quorum sensing both organisms benefit protection population disease parasitism one organism benefited the other unaffected normal biota pathogens Microbial Associations one organism benefited the other harmed microbes classified as causing mutualism commensalism nonsymbiosis symbiosis synergism antagonism

Portuguese innovations included which of the following O full use of the compass full use of the astrolabe cannons on their ships O all of the above O only a and c

Based on the BLUE line which one of the following is stabilizing selection A A B B C C A B Before After

In a population of mice living in a desert if the mice are too dark or too light colored they are easily spotted by predators This has led to most of the mice having a medium colored coat that blends best with the sand This kind of selection is known as 1 Point stabilizing selection directional selection disruptive selection 6X

Migration into and out of populations results in the movement of genes from one population to another This is known as 1 Point genetic drift adaptation natural selection gene flow

A random event in a small population can lead to a change in how common you find a trait Example a flood washes away all of the brown mice in an area and only a few white mice survive This is an example of 1 Point O genetic drift adaptation gene flow mutations

Directions Take a look at the photo below and answer the questions write your thoughts on this page Then complete the Essential Question 5 Symbolism can be a very powerful force for good or for bad What does the above symbol mean to you What do you feel when you see this symbol Explain your answer

Label the chart to review the major types of microbial associations Nonsymbiotic Synergism Organisms live in close nutritional relationships required by one or both members Parasitism Commensalism Mutualism Microbial Associations Symbiotic Antagonism

16 Zebrafish a common name for several species have a high fecundity Based on this statement identify one reproductive characteristic of the zebrafish a lays many eggs at once b reproduces about once each year c feeds and protects its young for a long time d becomes sexually mature late in its life span e invests a large amount of energy in raising its young 17 A population of bacteria is growing exponentially Which of these must be true a The resources are limited b The habitat is at its carrying capacity c The birth rate is the same as the death rate d The population is growing at its biotic potential e The growth pattern can be represented by an S shaped curve 18 Which is characteristic of species with a r selected life strategy a long life span b few offspring c late maturation d high level of prenatal care e live close to biotic potential 19 Which of these is a density independent limiting factor a availability of resources b competition c population size d predation e weather

Section 11 3 Factors That Regulate Natural Populations 10 Compare and contrast density independent and density dependent factors 2 marks zoob saaril

9 One of the curves on the graph below represents a population of a certain insect capable of infesting an entire area when growing at its biotic potential The other curve represents a population of a certain mammal in a limited environment Identify the curve that represents the insect population and the one that represents the mammal population For each curve explain what is occurring in each phase and why this is occurring 3 marks Number of Organisms Growth of Populations Time ham noitslugoq

noilsluqoq tosani orll alnasengen farit eri aineeeigen tarli eno od bris 7 In a population of 5000 individuals 600 newborns are produced annually and 800 individuals die annually Determine the per capita growth rate of this population 1 mark 8 What is the growth rate of a population in a habitat that has reached carrying in your answer 2 marks

c Przewalski s horses are nearly extinct in the wild but conservation efforts hope to increase their numbers Describe some causes of extinction and make a prediction about what factors contributed to the decline of the Przewalski s horse population 2 points

Early hunters and gatherers are the likely cause of which of the following the extinction of many animals O inventing technologies to improve agriculture Ocultivating new species of plants significantly contributing to air pollution

27 Match each of the following examples with the letter to the type of evidence for evolution it best represents 6 points Although humans have no tails we still have tail bones indicating a common ancestor with other tailed vertebrates Closely related trees of the genus Nothofagus are found throughout Australia South America and Antarctica despite these continents being separated by oceans Californian and Mediterranean plants have similar adaptations to dry environments including small leaves and deep roots However they are not closely related A Fossil Record B Biogeography C Artificial Selection D Natural Selection E Convergence F Homology

16 To attract a mate male frogs produce loud croaking calls with longer and more frequent calls being more attractive to females This is an example of a intrasexual selection b intersexual selection c disruptive selection d balancing selection 17 Which conditions would be most likely to produce sexual dimorphism between males and females of a species a Resources in the area are scarce b Intersexual selection is not strong c The male and female raise their young together d The female raises her young alone