Then, the instructor provides a few examples of how the growth model can be applied, including economic, medical, and conservation predictions and decision-making (Supporting File S1: Lesson Presentation Slides with Instructor Notes, slide 31). If desired, the instructor can write these answers on a board and identify biotic versus abiotic factors. PREDICTING AND PLOTTING POPULATION GROWTH (~10 MINUTES). I love teaching about population growth (ecology is one of my favorite subjects to teach). ACTIVITY: Graphing Population Growth (article. Nigeria's population is projected to nearly quadruple and four other African nations are expected to enter the world's most populated countries-the Democratic Republic of Congo (DRC), Egypt, Ethiopia, and Tanzania. Population Growth Worksheet.
Student responses to in-class questions are provided in the Progressing Through the Activity Section. In this human population growth lab, students simulate the exponential growth of an infectious disease in a population. Ask them to predict when a population will reach a given number in a certain sized environment. Population growth activity pdf answer key. Then, take a look at someone else's answers and think about whether you agree or disagree with one of their answers – be sure to point out why you agree or disagree. By altering these factors one at a time, and observing the results, students are able to clearly see the effect of each one. Students also performed well on the end-of-unit exam questions. What affects barnacle population size? SCIENTIFIC TEACHING THEMES.
Growth Patterns: Put a few example graphs on the board, some of which show unusual or "impossible" patterns (such as a graph in which the population is larger than the actual size of an average Petri dish, and a graph that shows the population is declining below zero; see Figures 1 and 2) and some of which show standard logistic growth curves. The ____-shaped curve is, by far, the most common in nature. In our first activity, K and N0 were kept constant: K = 20 and N0 = 10. Click to view other curriculum aligned to this Performance Expectation|. Ehrlich suggested methods such as increased taxation on larger families as a means of mitigating population growth. After small group discussion, the instructor can ask students to describe how they arrived at their answer. Do you think the human population on Earth has ever been more than it is now? This lesson is designed for a 50-minute lecture and is intended to introduce students to quantitative skills used in population ecology. Complete the activities on the Student activity sheet shown below. Teacher PowerPoint with diagrams and answer key provided directly onto the slides or in the notes section of each slide. Investigating population growth answer key. After restating different problem-solving techniques, the instructor provides an explanation of how to calculate density and abundance using mathematical equations (Supporting File S1: Lesson Presentation Slides with Instructor Notes, slides 9-10). To compare to some of the epidemics of the past, the percentage of the world's population killed between 1993 and 2002 decreased from 0. How does the population size change over time when r=4? By the end of this section, you will be able to do the following: - Discuss exponential human population growth.
In regards to question number one, the human growth looks to be rather slow. Inclusive teaching strategies. University of Maine, University of Calgary. To transition to the next section of the lecture, the instructor focuses students' attention to the variable of interest on the summary slide - the number of barnacles. For example, the instructor can highlight looking at the y-axis to determine if abundance or density is measured, the importance of considering population size and rate of growth separately, and the role of carrying capacity in producing the logistic growth curve. As innovations and collective learning increases these cycles began to vanish. Students were required to complete the pre-test in the 24-hours preceding the lesson. 4.5: Human Population Growth. A diversity of inclusive teaching practices are used throughout the lesson, including clicker questions with the think-pair-share model, worksheets, and instructor led discussions. The age structure of these populations is more conical, with an even greater percentage of middle-aged and older individuals. In an unlimited environment when the population is low, exponential growth of a population occurs. The population is projected to grow until the pressure of numerous limiting factors becomes too great, presumably at some point between the middle and end of the 21st Century. Density and abundance.
Exponential: Related to an exponent. Describe what r, K, and N0 are in a population. DP Biology: Population growth curves. On the post-test, students performed well on a question that asked them to compare the growth rate between two points on a linear growth curve (PPTQ6, 92% correct) and on a question that asked them to compare two points on an exponential growth curve (PPTQ7, 93% correct). Student responses are included in the lesson plan and in Supporting File 3: Clicker Questions and Student Responses.
The worksheet attached to this activity takes students through an introductory activity, but more is possible and this can be adapted to suit a class. Below are a few extra links, which may be useful in adapting the activities. Population growth activity answer key largo. Source: United Nations Population Division. Combining peer discussion with instructor explanation increases student learning from in-class concept questions. Justify this proposal in a group presentation.
Population ecology: experiments with protistans. Student performance on individual questions is discussed below. Interactive-engagement versus traditional methods: a six-thousand-student survey of mechanics test data for introductory physics courses. This combination of peer and instructor-led discussion has been shown to result in greater student gains than either peer discussion or instructor explanation alone (27). The word documents worksheets are provided in colour and grayscale. Models (e. g., physical, mathematical, computer models) can be used to simulate systems and interactions—including energy, matter, and information flows—within and between systems at different scales. After the introduction, distribute materials to the groups. Design forecasting techniques to evaluate the results of altering natural systems. Wars between powerful nations, Pandemics, over population that is until new technology was invented that raised the population barrier, I forgot what the exact name is.
Develop an understanding of a scientific concept by accessing information from multiple sources. Last modified: January 11, 2019. We report the percent correct for each question for those students who completed all components of the activity (n=433). STUDENT PERFORMANCE AND CONCEPTUAL DIFFICULTIES.
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