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

In a population pyramid, a broad base and narrow top typically indicates:

A A young population with high birth rate and rapid growth (expansive structure)

B An ageing population with low birth rate and negative growth (constrictive structure)

C A stable population with equal proportions of all age groups (stationary structure)

D A population with equal numbers of males and females across all age groups

Class 12 Biology

Which population growth model produces a sigmoid (S-shaped) curve and is considered more realistic for natural populations:

A Logistic growth model, which accounts for environmental resistance and carrying capacity

B Exponential growth model, which assumes unlimited resources

C Malthusian growth model, which emphasizes human population pressure

D Geometric growth model, which applies only to organisms with discrete breeding seasons

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 best describes the ecological interaction known as mutualism?

A One species benefits while the other is harmed

B Both species benefit from the interaction

C One species benefits while the other is unaffected

D The two species compete for the same limited resource

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 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

Comments

No comments yet. Be the first to share your thoughts!