Biology (9-1) - 0970 CIE

Populations

Muhtasari

Put a few yeast cells in sugar solution and come back in a week: where there were dozens, there are now millions, and then, just as suddenly, the numbers crash. Almost every population, from bacteria to buffalo, follows the same S-shaped story, racing upward and then hitting the limits of its world.

In this lesson you will define population, community and ecosystem, name the factors that drive numbers up and down, and read the four phases of the sigmoid growth curve. You will learn to explain each phase in terms of food, competition, predation and disease, the same limiting factors that decide how many of any species a habitat can hold.

Malengo

  1. Describe a population as a group of organisms of one species, living in the same area, at the same time
  2. Describe a community as all of the populations of different species in an ecosystem
  3. Describe an ecosystem as a unit containing the community of organisms and their environment, interacting together
  4. Identify and state the factors affecting the rate of population growth for a population of an organism, limited to food supply, competition, predation and disease
  5. Identify the lag, exponential (log), stationary and death phases in the sigmoid curve of population growth for a population growing in an environment with limited resources
  6. Interpret graphs and diagrams of population growth
  7. [Supplement] Explain the factors that lead to each phase in the sigmoid curve of population growth, making reference, where appropriate, to the role of limiting factors

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Maelezo ya Somo

Population growth shapes everything in ecology, including the human population itself. Knowing why numbers rise, level off and fall lets you predict the effect of a new predator, a disease outbreak or a richer food supply. Exam questions almost always show a sigmoid curve and ask you to label its phases and explain them using limiting factors, so the reasoning here is directly examinable.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Populations. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.

Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.

Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.

  1. A population is best described as: A. all the living things in an area B. a group of one species in the same area at the same time C. organisms plus their environment D. all the consumers in a food web Answer: B
  2. Which is NOT a factor affecting the rate of population growth? A. food supply B. predation C. disease D. the colour of the soil Answer: D
  3. In the sigmoid curve, the phase of most rapid growth is the: A. lag phase B. exponential phase C. stationary phase D. death phase Answer: B
  4. During the stationary phase of population growth: A. there are no births B. birth rate equals death rate C. death rate is zero D. the population doubles each hour Answer: B
  5. An ecosystem is: A. one species in an area B. all populations of different species C. a community plus its non-living environment D. only the producers Answer: C

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Vitabu Vinavyopendekezwa

Cambridge IGCSE Biology Coursebook
Cambridge IGCSE Biology Coursebook
Manukuu: Fifth edition
Mchapishaji: Cambridge University Press
Mwaka: 2021
ISBN: 978-1-108-74880-2
Maelezo: Endorsed coursebook with full coverage of the 0610/0970 syllabus, practical investigations and exam-style questions.
Cambridge IGCSE Biology
Cambridge IGCSE Biology
Manukuu: Fourth edition
Mchapishaji: Hodder Education
Mwaka: 2021
ISBN: 978-1-5104-7864-0
Maelezo: Endorsed textbook covering the Core and Supplement content with clear biological diagrams and questions.

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