Organisms and Populations MCQ Class 12

Organisms and Populations MCQ Class 12. These 100 Multiple Choice Questions (MCQ) on “Organisms and Populations” will help you score full marks in your Class 12 Biology exam.

Population Attributes

Definition of a Population

Question 1: What constitutes a population?

A. A group of individuals of different species living in a specific geographic area.B. A group of individuals of the same species living in a well-defined geographical area, sharing or competing for similar resources, and potentially interbreeding.C. All organisms living in a particular ecosystem.D. A collection of communities interacting with each other.

Show Explanation

Correct Answer: B. A group of individuals of the same species living in a well-defined geographical area, sharing or competing for similar resources, and potentially interbreeding. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 2: Which of the following is NOT a characteristic of a population?

A. Sharing or competing for similar resourcesB. Potential for interbreedingC. Composed of different speciesD. Living in a defined geographical area

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Correct Answer: C. Composed of different species. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 3:  A population can be best described as:

A.   A random collection of organisms in an area.B.   A group of interacting communities.C.   A cohesive group of the same species in a specific location.D.   All the living and non-living components of an environment.

Show Explanation

Correct Answer: C. A cohesive group of the same species in a specific location. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 4: What factor is essential for a group of individuals to be considered a population?

A. They must be of the same species.B. They must be geographically isolated from other populations.C. They must not compete for resources.D. They must all be of the same age.

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Correct Answer: A. They must be of the same species. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 5: Which of the following examples best represents a population?

A. All the birds in a forestB. All the trees in a parkC. All the fish in a lakeD. All the deer in a specific valley

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Correct Answer: D. All the deer in a specific valle (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

Key Attributes of a Population

Question 6:  What is meant by the term ‘sex ratio’ in a population?

A. The ratio of young individuals to old individualsB. The proportion of males to femalesC. The rate of population growthD. The number of individuals per unit area

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Correct Answer: B. The proportion of males to females (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 7:  Which of the following is NOT a key attribute of a population?

A. Species diversity B. Birth rateC. Death rateD. Age distribution

Show Explanation

Correct Answer: A. Species diversit (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

Question 8:  The ‘age pyramid’ of a population provides information about:

A. The growth status of the population.B. The number of species in the population.C. The types of interactions between populations.D. The carrying capacity of the environment.

Show Explanation

Correct Answer: A. The growth status of the population. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 9:  What do birth rates and death rates represent in a population?

A. The overall health of individualsB. The per capita change in the number of individualsC. The migration patterns of individualsD. The availability of resources in the environment

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Correct Answer: B. The per capita change in the number of individuals (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 10:  A population with a high proportion of young individuals is likely to:

A. Decline rapidly.B. Remain stable.C. Grow rapidly.D. Migrate to a new location.

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Correct Answer: C. Grow rapidly. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 11:  What does a stable age pyramid indicate about a population?

A.   The population is likely to grow rapidly.B.   The population is likely to decline rapidly.C.   The population is likely to remain relatively constant in size.D.   The population is likely to experience a sudden increase in birth rate.

Show Explanation

Correct Answer: C.  The population is likely to remain relatively constant in size. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 12:  Which of the following factors can significantly influence the sex ratio of a population?

A.   Availability of foodB.   Environmental conditionsC.   Selective predationD.   All of the above

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Correct Answer: D.  All of the above (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 13:  Why is understanding the age distribution of a population important?

A.   It helps predict future population growth trends.B.   It provides insights into the reproductive potential of the population.C.   It can inform conservation efforts.D.   All of the above

Show Explanation

Correct Answer: D.  All of the above (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 14:  How do birth rates and death rates affect population size?

A.   High birth rates and low death rates lead to population growth.B.   Low birth rates and high death rates lead to population decline.C.   Equal birth rates and death rates lead to a stable population.D.   All of the above

Show Explanation

Correct Answer: D.  All of the above (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 15:  What can an age pyramid with a narrow base indicate?

A.   A high birth rateB.   A low birth rateC.   A stable populationD.   None of the above

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Correct Answer: B.  A low birth rate (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

 

  

Population Density

Question 16: What is population density?

A. The number of individuals in a population.B. The number of individuals per unit area or volume.C. The distribution of different age groups in a population.D. The rate at which a population is growing.

Show Explanation

Correct Answer: B. The number of individuals per unit area or volume. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 17: Which of the following is NOT a method for measuring population density?

A. Total number of individualsB. Percent coverC. BiomassD. Sex ratio

Show Explanation

Correct Answer: D. Sex ratio (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 18:  How might population density affect the availability of resources within a population?

A.   High population density could lead to increased competition for resources.B.   Low population density could lead to difficulty finding mates.C.   Both A and BD.   Neither A nor B

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Correct Answer: C.  Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 19:  Which method of measuring population density would be most appropriate for a population of  large trees?

A.   Total numberB.   Percent coverC.   BiomassD.   Any of the above

Show Explanation

Correct Answer: A.  Total number (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 20:  Which method of measuring population density would be most appropriate for a population of small grasses?

A.   Total numberB.   Percent coverC.   BiomassD.   Any of the above

Show Explanation

Correct Answer: B.  Percent cover (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 21:  Why might biomass be a useful measure of population density for some species?

A.   It takes into account the size of individuals.B.   It is easier to measure than total number.C.   It is more accurate than percent cover.D.   All of the above.

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Correct Answer: A.  It takes into account the size of individuals. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 22:  What factors can influence population density?

A.   Resource availabilityB.   PredationC.   CompetitionD.   All of the above

Show Explanation

Correct Answer: D.  All of the above (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 23:  How might high population density impact individuals within a population?

A.   Increased risk of disease transmissionB.   Reduced access to resourcesC.   Increased stress levelsD.   All of the above

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Correct Answer: D.  All of the above (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Estimating Population Size

Question 24: Which of the following is a direct method for estimating population size?

A. Counting pugmarksB. Counting fecal pelletsC. Direct counting of individualsD. Sampling a portion of the population

Show Explanation

Correct Answer: C. Direct counting of individuals (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 25:  What is a ‘pugmark’?

A.   A type of sampling methodB.   A direct method for counting individualsC.   An indirect method for estimating population size based on animal tracksD.   A measure of population density

Show Explanation

Correct Answer: C.  An indirect method for estimating population size based on animal tracks (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

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Question 26:  Which of the following is an indirect method for estimating population size?

A.   Quadrat samplingB.   Counting nestsC.   Mark and recaptureD.   None of the above

Show Explanation

Correct Answer: B.  Counting nests (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 27:  Why might indirect methods be preferred for estimating the size of certain populations?

A.   They are always more accurate than direct methods.B.   They are less disruptive to the population.C.   They are easier to implement for large or elusive populations.D.   Both B and C

Show Explanation

Correct Answer: D.  Both B and C (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 28:  What is the purpose of sampling methods in estimating population size?

A.   To avoid counting every individual in a large populationB.   To provide a representative estimate of the entire populationC.   To make data collection more manageableD.   All of the above

Show Explanation

Correct Answer: D.  All of the above (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Population Growth

Factors Influencing Population Growth

Question 29: What are the four primary factors influencing population density?

A. Natality, mortality, immigration, emigrationB. Birth rate, death rate, sex ratio, age distributionC. Predation, competition, parasitism, mutualismD. Exponential growth, logistic growth, carrying capacity, life history variation

Show Explanation

Correct Answer: A. Natality, mortality, immigration, emigration (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 30: Which factor contributes to an increase in population density?

A. MortalityB. EmigrationC. ImmigrationD. All of the above

Show Explanation

Correct Answer: C. Immigration (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 31: Which factor contributes to a decrease in population density?

A. NatalityB. ImmigrationC. EmigrationD. All of the above

Show Explanation

Correct Answer: C. Emigration (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 32: What is the term for the number of births in a population during a given period?

A. MortalityB. NatalityC. ImmigrationD. Emigration

Show Explanation

Correct Answer: B. Natalit (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

Question 33: What is the term for the number of deaths in a population during a given period?

A. MortalityB. NatalityC. ImmigrationD. Emigration

Show Explanation

Correct Answer: A. Mortalit (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

Question 34: What is the term for the number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration?

A. MortalityB. NatalityC. ImmigrationD. Emigration

Show Explanation

Correct Answer: C. Immigration (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 35: What is the term for the number of individuals of the population who left the habitat and gone elsewhere during the time period under consideration?

A. MortalityB. NatalityC. ImmigrationD. Emigration

Show Explanation

Correct Answer: D. Emigration (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 36: Which two factors are considered the most important in influencing population density under normal conditions?

A. Immigration and emigrationB. Natality and mortalityC. Natality and immigrationD. Mortality and emigration

Show Explanation

Correct Answer: B. Natality and mortalit (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

Question 37: Which factor can significantly contribute to population growth in a newly colonized habitat?

A. EmigrationB. ImmigrationC. MortalityD. All of the above

Show Explanation

Correct Answer: B. Immigration (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 38: How does the availability of food affect population growth?

A. Abundant food can lead to increased natality and decreased mortality.B. Scarce food can lead to decreased natality and increased mortality.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 39: How can predation affect population growth?

A. High predation pressure can lead to decreased natality and increased mortality of the prey species.B. Low predation pressure can lead to increased natality and decreased mortality of the prey species.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 40: How can adverse weather conditions affect population growth?

A. Harsh weather can lead to decreased natality and increased mortality.B. Favorable weather can lead to increased natality and decreased mortality.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 41: How do population fluctuations provide insights into the overall health of a population?

A. They can indicate responses to environmental changes.B. They can reveal the presence of limiting factors.C. They can help assess the carrying capacity of the habitat.D. All of the above

Show Explanation

Correct Answer: D. All of the above (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 42: What is the role of density-dependent factors in population regulation?

A. They affect populations regardless of their size.B. They have a greater impact on populations as density increases.C. They are primarily abiotic factors.D. They have no effect on population dynamics.

Show Explanation

Correct Answer: B. They have a greater impact on populations as density increases. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Exponential Growth

Question 43: What is the term for the maximum population size that a habitat can support?

A. Carrying capacityB. Intrinsic rate of natural increaseC. Population densityD. None of the above

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Correct Answer: A. Carrying capacit (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

Question 44: Which type of population growth occurs when resources are unlimited?

A. Logistic growthB. Exponential growthC. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: B. Exponential growth (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 45: What shape is the growth curve for a population experiencing exponential growth?

A. S-shapedB. J-shapedC. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: B. J-shaped (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Logistic Growth

Question 46: Which type of population growth occurs when resources are limited?

A. Logistic growthB. Exponential growthC. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: A. Logistic growth (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 47: What shape is the growth curve for a population experiencing logistic growth?

A. S-shapedB. J-shapedC. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: A. S-shaped (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 48: What is the term for the maximum population size that a habitat can support in logistic growth?

A. Carrying capacityB. Intrinsic rate of natural increaseC. Population densityD. None of the above

Show Explanation

Correct Answer: A. Carrying capacit (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

Question 49: What happens to the growth rate of a population as it approaches its carrying capacity?

A. It increases.B. It decreases.C. It remains constant.D. None of the above

Show Explanation

Correct Answer: B. It decreases. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 50: Which of the following factors can influence the carrying capacity of a habitat?

A. Resource availabilityB. CompetitionC. PredationD. All of the above

Show Explanation

Correct Answer: D. All of the above (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Life History Variation

Reproductive Strategies

Question 51: What is the term for the suite of traits related to reproduction that maximize an organism’s fitness in a given environment?

A. Reproductive strategyB. Life history traitsC. Population growthD. None of the above

Show Explanation

Correct Answer: A. Reproductive strateg (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

Question 52: Which of the following is NOT a component of an organism’s reproductive strategy?

A. Frequency of breedingB. Number of offspring producedC. Size of offspringD. Population density

Show Explanation

Correct Answer: D. Population densit (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

Question 53: What is the term for the number of offspring produced by an organism at a given time or during its lifetime?

A. Clutch sizeB. FecundityC. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

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Question 54: What is the relationship between the number of offspring produced and the amount of parental care provided?

A. Organisms that produce many offspring tend to provide little parental care.B. Organisms that produce few offspring tend to provide more parental care.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 55: Which of the following is an example of an organism with a high fecundity and low parental care strategy?

A. OystersB. HumansC. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: A. Oysters (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 56: Which of the following is an example of an organism with a low fecundity and high parental care strategy?

A. OystersB. HumansC. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: B. Humans (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 57: How does the size of offspring affect their survival chances?

A. Larger offspring tend to have higher survival chances.B. Smaller offspring tend to have higher survival chances.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: A. Larger offspring tend to have higher survival chances. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 58: What is the trade-off involved in producing many small offspring versus few large offspring?

A. Many small offspring have a higher individual survival chance.B. Few large offspring require more parental investment.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: B. Few large offspring require more parental investment. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 59: How does environmental stability influence reproductive strategies?

A. Stable environments favor organisms that produce many small offspring.B. Unstable environments favor organisms that produce few large offspring.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: A. Stable environments favor organisms that produce many small offspring. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 60: How does the availability of resources influence reproductive strategies?

A. Abundant resources favor organisms that produce many offspring.B. Limited resources favor organisms that produce few offspring.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Life History Traits

Question 61: What is the term for the characteristics of an organism that influence its survival and reproduction?

A. Reproductive strategiesB. Life history traitsC. Population growthD. None of the above

Show Explanation

Correct Answer: B. Life history traits (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 62: Which of the following is NOT a life history trait?

A. LongevityB. Age at first reproductionC. Number of offspringD. Population density

Show Explanation

Correct Answer: D. Population densit (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

Question 63: What is the term for the average lifespan of an organism in a population?

A. LongevityB. Age at first reproductionC. FecundityD. None of the above

Show Explanation

Correct Answer: A. Longevit (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

Question 64: How does the age at first reproduction affect population growth?

A. Early reproduction leads to faster population growth.B. Delayed reproduction leads to faster population growth.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: A. Early reproduction leads to faster population growth. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 65: What is the relationship between longevity and reproductive output?

A. Longer-lived organisms tend to have higher reproductive output.B. Shorter-lived organisms tend to have higher reproductive output.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: A. Longer-lived organisms tend to have higher reproductive output. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 66: How does environmental stability influence life history traits?

A. Stable environments favor organisms with longer lifespans and delayed reproduction.B. Unstable environments favor organisms with shorter lifespans and early reproduction.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 67: How does resource availability influence life history traits?

A. Abundant resources favor organisms with longer lifespans and higher reproductive output.B. Limited resources favor organisms with shorter lifespans and lower reproductive output.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 68: What is the role of natural selection in shaping life history traits?

A. It favors traits that maximize an organism’s fitness in its environment.B. It leads to the evolution of different life history strategies.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 69: How does the concept of trade-offs apply to life history traits?

A. Organisms must allocate limited resources among different life history traits.B. Investing in one trait may come at the expense of another trait.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 70: Why is understanding life history variation important for conservation efforts?

A. It helps predict how populations will respond to environmental changes.B. It can inform management strategies for endangered species.C. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Population Interactions

Interspecific Interactions

Question 71: What is the term for interactions that occur between populations of two different species in a community?

A. Intraspecific interactionsB. Interspecific interactionsC. Both A and BD. Neither A nor B

Show Explanation

Correct Answer: B. Interspecific interactions (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 72: Which of the following is NOT a type of interspecific interaction?

A. PredationB. CompetitionC. MutationD. Mutualism

Show Explanation

Correct Answer: C. Mutation (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 73: What is the term for an interaction in which one species benefits and the other is neither harmed nor benefited?

A. PredationB. CompetitionC. CommensalismD. Mutualism

Show Explanation

Correct Answer: C. Commensalism (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 74: What is the term for an interaction in which both species benefit from the interaction?

A. PredationB. CompetitionC. CommensalismD. Mutualism

Show Explanation

Correct Answer: D. Mutualism (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 75: What is the term for an interaction in which one species is harmed and the other is neither harmed nor benefited?

A. AmensalismB. CommensalismC. MutualismD. Competition

Show Explanation

Correct Answer: A. Amensalism (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 76: How can interspecific interactions influence the distribution and abundance of species in a community?

A. They can affect the availability of resources.B. They can alter the survival and reproduction rates of species.C. They can drive evolutionary changes in populations.D. All of the above

Show Explanation

Correct Answer: D. All of the above (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 77: What is the term for the reciprocal evolutionary changes that occur between interacting species?

A. Co-evolutionB. Natural selectionC. AdaptationD. None of the above

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Correct Answer: A. Co-evolution (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Types of Interactions

Question 78: What is the term for an interaction where one organism benefits by killing and consuming another organism?

A. PredationB. CompetitionC. ParasitismD. Commensalism

Show Explanation

Correct Answer: A. Predation (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

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Question 79: What is the term for the organism that is killed and consumed in a predation interaction?

A. PredatorB. PreyC. ParasiteD. Host

Show Explanation

Correct Answer: B. Pre (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

Question 80: What is the term for the organism that benefits in a predation interaction?

A. PredatorB. PreyC. ParasiteD. Host

Show Explanation

Correct Answer: A. Predator (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 81: Which of the following is NOT an example of a predator-prey relationship?

A. Tiger and deerB. Sparrow and seedC. Lion and zebraD. Bee and flower

Show Explanation

Correct Answer: D. Bee and flower (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 82: What is the term for an interaction where two or more species compete for the same resources?

A. PredationB. CompetitionC. ParasitismD. Commensalism

Show Explanation

Correct Answer: B. Competition (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 83: What is the term for an interaction where one species benefits at the expense of another species without killing it?

A. PredationB. CompetitionC. ParasitismD. Commensalism

Show Explanation

Correct Answer: C. Parasitism (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 84: What is the term for the organism that benefits in a parasitic interaction?

A. PredatorB. PreyC. ParasiteD. Host

Show Explanation

Correct Answer: C. Parasite (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 85: What is the term for the organism that is harmed in a parasitic interaction?

A. PredatorB. PreyC. ParasiteD. Host

Show Explanation

Correct Answer: D. Host (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 86: Which of the following is NOT an example of a parasitic relationship?

A. Tick on a dogB. Cuscuta on a hedge plantC. Mycorrhizae on plant rootsD. Liver fluke in a human

Show Explanation

Correct Answer: C. Mycorrhizae on plant roots (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 87: What is the term for an interaction where one species benefits and the other is neither harmed nor benefited?

A. PredationB. CompetitionC. ParasitismD. Commensalism

Show Explanation

Correct Answer: D. Commensalism (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 88: Which of the following is NOT an example of a commensal relationship?

A. Orchid growing on a mango treeB. Barnacles growing on a whaleC. Cattle egret and grazing cattleD. Lichen (fungus and algae)

Show Explanation

Correct Answer: D. Lichen (fungus and algae) (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 89: What is the term for an interaction where both species benefit from the interaction?

A. PredationB. CompetitionC. ParasitismD. Mutualism

Show Explanation

Correct Answer: D. Mutualism (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 90: Which of the following is NOT an example of a mutualistic relationship?

A. Lichen (fungus and algae)B. Mycorrhizae (fungi and plant roots)C. Fig tree and waspD. Abingdon tortoise and goats

Show Explanation

Correct Answer: D. Abingdon tortoise and goats (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 91: How can predation act as a natural method of pest control?

A. Predators can keep prey populations below damaging levels.B. Predators can increase the diversity of prey species.C. Both A and BD. Neither A nor B

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Correct Answer: A. Predators can keep prey populations below damaging levels. (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 92: What is the term for the camouflage that allows organisms to blend in with their surroundings?

A. Cryptic colorationB. Warning colorationC. MimicryD. None of the above

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Correct Answer: A. Cryptic coloration (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 93: What is the purpose of warning coloration in some organisms?

A. To attract matesB. To signal that they are poisonous or distastefulC. To blend in with their surroundingsD. None of the above

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Correct Answer: B. To signal that they are poisonous or distasteful (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Co-evolution

Question 94: What is the term for the reciprocal evolutionary changes that occur between interacting species?

A. Co-evolutionB. Natural selectionC. AdaptationD. None of the above

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Correct Answer: A. Co-evolution (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 95: Which of the following is NOT an example of co-evolution?

A. Predator and prey adaptationsB. Plant and pollinator interactionsC. Host and parasite interactionsD. Exponential growth of a population

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Correct Answer: D. Exponential growth of a population (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 96: How does co-evolution contribute to the diversity of life on Earth?

A. It leads to the development of specialized relationships between species.B. It drives the evolution of new traits and adaptations.C. Both A and BD. Neither A nor B

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Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 97: What is the term for the close relationship between the evolution of a flower and its pollinator?

A. Co-evolutionB. Pollination syndromeC. Both A and BD. Neither A nor B

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Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 98: How does the fig tree and wasp relationship illustrate co-evolution?

A. The fig tree provides food and shelter for the wasp larvae.B. The wasp pollinates the fig flowers.C. Both A and BD. Neither A nor B

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Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 99: How does the orchid and bee relationship illustrate co-evolution?

A. The orchid mimics the female bee to attract the male bee for pollination.B. The bee pollinates the orchid while attempting to mate with the flower.C. Both A and BD. Neither A nor B

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Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Question 100: How does co-evolution contribute to the stability of ecosystems?

A. It strengthens the relationships between species within a food web.B. It increases the resilience of ecosystems to disturbances.C. Both A and BD. Neither A nor B

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Correct Answer: C. Both A and B (Organisms and Populations MCQ Class 12 by Top100MCQ.com)

   

Most Asked Important Questions on Organisms and Populations

Read Also: 100 MCQ on Ecosystem Class 12