Lesson 6.3.2a
6.3.2a Population size and interactions Quiz: OCR Biology, Unit 9
20 questions
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Lesson 6.3.2a, Population size and interactions: 20 multiple choice questions for the OCR Biology (H020), Unit 9: Ecosystems, written with Revision Ninja.
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The 20 questions
-
What term defines the maximum stable population size an ecosystem can support?
- Biotic potential
- Climax community
- Environmental resistance
- Carrying capacity
-
Which of these is a density-dependent factor affecting population size?
- Disease
- Volcanic eruption
- Severe frost
- Tsunami
-
Which of these is a density-independent factor affecting population size?
- Disease
- Predation
- Volcanic eruption
- Interspecific competition
-
What term describes competition between individuals of the same species?
- Interspecific competition
- Intraspecific competition
- Competitive exclusion
- Resource partitioning
-
What term describes competition between individuals of different species?
- Intraspecific competition
- Interspecific competition
- Competitive exclusion
- Mutualism
-
How do predator populations typically respond following a rise in prey numbers?
- Remain completely constant
- Rise after delay
- Rise instantly
- Fall immediately
-
Which principle states that two species with identical niches cannot coexist indefinitely?
- Carrying capacity
- Competitive exclusion
- Resource partitioning
- Successional displacement
-
In the logistic growth model, at what population size is the growth rate highest when the carrying capacity is 1000?
- 500
- 750
- 250
- 1000
-
Following a sharp increase in predator numbers, what immediately happens to prey numbers?
- They double
- They decrease
- They remain constant
- They increase
-
What happens to carrying capacity when a limiting nutrient is added to an ecosystem?
- It remains unchanged
- It increases
- It drops to zero
- It decreases
-
What is the outcome when two species occupy exactly the same ecological niche?
- Both species coexist
- One species excluded
- Increased biodiversity
- Mutualistic symbiosis
-
A population of 400 lives in an environment with a carrying capacity of 500. What percentage of carrying capacity is this?
- 20%
- 400%
- 125%
- 80%
-
Which of these is a density-independent factor affecting an insect population?
- Parasitism of individuals
- Predation by birds
- Severe frost
- Competition for food
-
Which term describes an interspecific interaction where both organisms benefit?
- Predation
- Parasitism
- Mutualism
- Commensalism
-
In a predator-prey system, what increases directly after prey numbers rise?
- Predator mortality rate
- Prey birth rate
- Interspecific competition
- Predator birth rate
-
What term describes the maximum stable population size an ecosystem can support?
- Environmental resistance
- Economic yield
- Carrying capacity
- Biotic potential
-
A population of 200 has a birth rate of 0.3 per individual per year and a death rate of 0.1 per individual per year. What is the expected change in one year?
- +20
- +40
- -40
- +60
-
What causes the time lag in predator population peaks behind prey peaks?
- Rapid prey adaptation
- Instantaneous birth rates
- Time needed to reproduce
- Immediate migration of predators
-
A population of 800 has a carrying capacity of 1000 and a logistic intrinsic growth rate r = 0.2 per year. Using dN/dt = rN(1 - N/K), what is the expected change in one year?
- 32
- 160
- 200
- 8
-
What allows two competing species to coexist long-term in the same habitat?
- Identical niches
- Intraspecific competition
- Competitive exclusion
- Niche differentiation
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