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Organisms and Populations Test - 51

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Organisms and Populations Test - 51
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  • Question 1
    1 / -0
    Increase in number of individuals in a population represents
    Solution
    Correct Option: C

    Explanation:
    • A population refers to a group of organisms of a species that interbreed and live in the same place at the same time.
    • Population density is defined as the number of individuals per unit geographic area.
    • The increase in density is due to the increased birth rate, immigration, adaptation to the environmental changes. 
    • Natality increases birth rate, Mortality decreases death rate, Diversity is the variation in the population. 

      • Thus, the correct answer is Density.
  • Question 2
    1 / -0
    Exponential population growth is represented by 
    Solution
    Correct option: A

    Explanation:
    • When food and space for a population is unlimited, each species has the ability to fully grow up to its potential. Then the population grows in an exponential or geometric ratio. This is represented by dN/dt = rN. 
    • Let, In a population of size N, the birth rates and death rates per capita are represented by b and d respectively. The increase or decrease in N during a unit time period t (dN/dt) will be-
      dN/dt = (b-d) * N
      where (b-d) = r (intrinsic rate of natural increase)
      then, dN/dt = rN.
    • Thus, Option A is correct.
  • Question 3
    1 / -0
    Under non-limiting environmental conditions, there will be 
    Solution
    Non limiting environmental conditions are the ones which have maximum favourable factors for growth of a population. As a result, the environment will support maximum growth and will see minimum death of individuals.
    So, option A is the correct answer.
  • Question 4
    1 / -0
    In a population the rate of addition of new members is more than the members lost. The population shows
    Solution
    When in a population, the birth rate increases than the death rate, population tends to expand. So, the number of new members that can be added in a population increases than the number of members lost. This causes exponential growth of population.
    So, option A is the correct answer.
  • Question 5
    1 / -0
    Which ones are true about interdependence (a) one is benefited and other unaffected in mutualism (b) Both partners are benefited in commensalism (c) One kills and feeds on another in predation (d) Both partners are benefited in  symbiosis
    Solution
    i) Mutualism is a type of relationship which is only beneficial to both the organisms.
    ii) Competition is a type of relationship which is harmful to both the organisms.
    iii) Parasitism is a type of relationship which is beneficial for one organism but harmful to the other.
    iv) Predation is a type of relationship which is beneficial for one organism but inhibits the growth of the other.
    v) Commensalism is a type of relationship which is beneficial for one organism and has no effect on the other organism. Therefore, the options C and D are only true.
  • Question 6
    1 / -0
    Competition causes 
    Solution
    As a result of competition, the number of living organisms get distribute d here and there. So, there habitats get distribute d and so do their niches.
    So, option D is the correct answer.
  • Question 7
    1 / -0
    Which one is appropriately defined ?
    Solution

    A. A host is an animal or plant in which a parasite lives.

    B. Amensalism is a relationship between two organisms in which one is inhibited or destroyed and the other is unaffected.

    C. Predators are those that obtains food by the killing and consuming of other organisms

    D. A parasite is an organism that lives in another organism, called the host, and often harms it.


    Therefore, option C is the correct answer.

  • Question 8
    1 / -0
    A symbiotic bacterium is
    Solution
    Rhizobia are diazotrophic bacteria that fix nitrogen after becoming established inside the root nodules of legumes. Rhizobia are unique in that they are the only nitrogen-fixing bacteria living in a symbiotic relationship with legumes.

    So, the correct answer is 'Rhizobium'.
  • Question 9
    1 / -0
    Rhizosphere microflora exhibits 
    Solution
    The rhizosphere is the narrow region of soil that is directly influenced by root secretions, and associated soil microorganisms known as the root microbiome The rhizosphere contains many bacteria and other microorganisms that feed on sloughed-off plant cells, termed rhizodeposition, and the proteins and sugars released by roots. This symbiosis leads to more complex interactions, influencing plant growth and competition for resources.

    So, the correct answer is 'symbiosis'.
  • Question 10
    1 / -0
    Stronger partner is benefited and weaker partner is damaged in
    Solution
    A predator is an organism that eats another organism. The prey is the organism which the predator eats. Some examples of predator and prey are lion and zebra, bear and fish, and fox and rabbit.

    So, the correct answer is 'Predation'.
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