Organisms And Population Mock Tests

22 questions available

Organisms And Population Mock Test 1

Questions: 22

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Class 12 Biology

Which population interaction is characterized by one species benefiting while the other is neither helped nor harmed:

A Mutualism

B Commensalism

C Parasitism

D Competition

Class 12 Biology

Interference competition, amensalism, and predation are ecological interactions respectively where the involved species are:

A One harmed and one benefited; one harmed and other unaffected; both harmed

B Both harmed; one harmed and other unaffected; one harmed and one benefited

C One harmed and one benefited; both harmed; one harmed and one benefited

D Both unaffected; one harmed and one benefited; both harmed

Class 12 Biology

Population density can be measured by all of the following methods EXCEPT:

A Counting the number of individuals in a randomly selected quadrat for mobile animals like tigers

B Counting the number of bacteria in a culture flask by measuring optical density

C Counting the number of deer in a forest by direct counting in a camera trap survey

D Measuring the percentage cover of a plant species in a given area

Class 12 Biology

The exponential growth equation dN/dt = rN describes a population when resources are unlimited. In this equation, "r" represents:

A The intrinsic rate of natural increase per individual

B The carrying capacity of the environment

C The total population size at time t

D The birth rate minus the death rate of the entire population

Class 12 Biology

Which of the following statements about the logistic growth model dN/dt = rN(1 − N/K) is correct?

A When N approaches K, the population growth rate approaches zero

B The population grows exponentially regardless of the carrying capacity

C The carrying capacity K represents the maximum genetic diversity of the population

D The model predicts a J-shaped growth curve under all conditions

Class 12 Biology

According to Gause's competitive exclusion principle:

A Two species competing for the same limiting resources cannot coexist indefinitely

B Two species always benefit from sharing the same ecological niche

C Competition between species always leads to mutualism

D Predation always benefits the prey population by removing weak individuals

Class 12 Biology

Which of the following population interactions is correctly matched with its description?

A Predation — one species benefits, the other is harmed

B Commensalism — both species benefit from the interaction

C Parasitism — both species are harmed equally

D Mutualism — one species benefits, the other is unaffected

Class 12 Biology

Which of the following correctly describes the relationship between population birth rate and death rate in a rapidly growing population:

A Birth rate is significantly higher than death rate

B Death rate is higher than birth rate

C Birth rate equals death rate

D Birth and death rates are both zero

Organisms And Population Mock Tests

Organisms And Population Mock Test 1

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