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
- Describe a population as a group of organisms of one species, living in the same area, at the same time
- Describe a community as all of the populations of different species in an ecosystem
- Describe an ecosystem as a unit containing the community of organisms and their environment, interacting together
- 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
- 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
- Interpret graphs and diagrams of population growth
- [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
Maelezo ya Somo
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
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.
- 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
- 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
- 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
- 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
- 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
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Populations? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
Pakua Programu Kwenye Google Playstore
Kila kitu unachohitaji ili kufaulu katika JAMB, WAEC & NECO.
