19.4. Populations
A subsection of Biology, 0610, through 19. Organisms and their environment
Listing 10 of 167 questions
Define the term population by completing the sentence. A population is a group of organisms of one , living in the same , at the same . The human population size of one country was monitored between 1950 and 2010. shows the results. population / million year Calculate the difference in population size between 1950 and 2010. million State the year when the population size was 56 million. State three factors that can cause an increase in population size. Discuss the negative impacts on the environment of a continual increase in the size of the human population.
0610_w21_qp_32
THEORY
2021
Paper 3, Variant 2
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The boxes on the left show two terms. The boxes on the right show the descriptions of some terms. Draw one line to link each term to its description. Draw two lines. term community population description a group of organisms that can reproduce to produce fertile offspring all of the populations of different species in an ecosystem an organism that gets its energy by feeding on other organisms a group of organisms of one species, living in the same area, at the same time the position of an organism in a food chain, food web or ecological pyramid a unit containing the different species of organisms and their environment, interacting together The growth of bacteria in a flask containing nutrients was monitored for six hours. The number of live bacteria per cm3 was estimated every 30 minutes. shows the results. 0.0 10 000 20 000 30 000 40 000 50 000 60 000 70 000 0.5 1.0 1.5 2.0 2.5 time / hours 3.0 3.5 4.0 4.5 5.0 5.5 6.0 number of live bacteria per cm3 A B C D The data in the graph has been divided into four phases: A, B, C and D. The list shows the names of the four phases. death exponential lag stationary Use the words from the list to identify phases A, B, C and D shown in . A B C D Complete the sentences using the data shown in and your knowledge. The number of live bacteria in phase A remained at per cm3. In phase B the number of live bacteria doubled between 2.0 hours and hours. The maximum number of live bacteria occurred in phase . In phase the number of live bacteria decreased because the bacteria did not have enough .
0610_w23_qp_31
THEORY
2023
Paper 3, Variant 1
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Questions Discovered
167