Organisms And Population Mock Tests

22 questions available

Organisms And Population Mock Test 1

Questions: 22

Sample Questions

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

In the context of population ecology, the carrying capacity (K) of an environment refers to:

A The maximum population size that the environment can sustain indefinitely

B The rate at which a population grows exponentially

C The minimum number of individuals needed to avoid extinction

D The total biomass of all organisms in an ecosystem

Class 12 Biology

Which of the following is an example of commensalism (an interaction where one species benefits and the other is unaffected):

A Barnacles attached to the skin of whales — barnacles gain mobility and access to food, while the whale is neither harmed nor benefited

B Opuntia (cactus) epiphytes growing on other tree branches in the Amazon — epiphytes benefit from better light, while the host tree is unaffected

C Both a and b

D Cleaner fish removing parasites from larger fish — both species benefit

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

In ecology, the interaction between a sea anemone and a hermit crab, where the anemone gets mobility and access to more food while the crab gets protection from predators through stinging nematocysts, is an example of:

A Mutualism — both species benefit

B Commensalism — one benefits, the other is unaffected

C Parasitism — one benefits, the other is harmed

D Amensalism — one is harmed, 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

Class 12 Biology

An age pyramid with a broad base and a narrow top indicates a:

A Growing population with a high proportion of young individuals (pre-reproductive and reproductive age groups)

B A stable population with roughly equal proportions of all age groups

C A declining population with a high proportion of older individuals

D A population with equal birth and death rates

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

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