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Organisms and Populations Test - 18

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Organisms and Populations Test - 18
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  • Question 1
    1 / -0
    Which of the following describes the relationship between two organisms in which one benefits and neither is harmed?
    Solution

    Omnivory refers to act of feeding on plants and animals; plants and animals are negatively affected. Mutualism is an association of organisms wherein both are benefitted. Parasitism is the relationship where one organism is benefitted at the expense of other. Predation refers to the act of feeding on other animals; predator is benefitted at expense of prey. Commensalism refers to the relationship wherein one organism is benefitted while other remains unaffected. Thus, the correct answer is A.

  • Question 2
    1 / -0
    All the relationship between the two organisms or species in which both the partners derive benefit from each other is known as 
    Solution
    All the different groups of the population living in an area form population interactions between them. Symbiosis is a type of population interaction in which both groups of the population living together mutually benefit each other. For example, Rhizobium bacteria living in root nodules of leguminous plants provide the plants with their nitrogen requirements and in return, the bacteria obtain shelter and nutrition.
    In parasitism, one organism is harmed and the other is benefited, at the cost of the former. In commensalism, one is benefited and another is neither harmed nor benefited. 
    So the correct option is B.
  • Question 3
    1 / -0
    Number of births per year per 1000 individuals is 
    Solution
    The number of individuals that are born per 1000 individuals is called the natality of that population. Demography is the statisticall analysis of births, deaths, income etc in a particular population. Mortality indicates the number of deaths in a population. Whereas density of a population is the number of individuals living in a particular environment in accordance to it's area.
    So, option B is the correct answer 
  • Question 4
    1 / -0
    Find out the odd one for parasitism.
    Solution
    • Bed bugs are a type of insect parasites that feed on human blood, usually at night.
    • Lice are obligate parasites, living externally on warm-blooded hosts which include every species of bird and mammal.  Lice are vectors of diseases such as typhus.
    • Mites are small arthropods. Most species are harmless to humans but a few are associated with allergies or may transmit diseases.
    • Plasmodium is a genus of unicellular eukaryotes (protozoa) that are obligate parasites of vertebrates and insects.
    • Bed bug, lice and mites belong to phylum Arthropoda and they are insects which act as extracellular parasites of humans and other animals. Whereas, plasmodium belong to phylum Protozoa and it is an intracellular parasite.
    So, the correct answer is 'Plasmodium'.
  • Question 5
    1 / -0
      Column I  Column II
     a Mutualism  1. Tiger and Deer
     b Commensalism 2. Cuscuta on Cissus
     c Parasitism 3. Suckerfish and Shark
     d Predation 4. Crab and Sea Anemone
    Match the columns

  • Question 6
    1 / -0
    Ladybug is a predator of
  • Question 7
    1 / -0
    A relationship in which one organism benefits and the other is neither benefitted nor harmed is known as 
    Solution
    Commensalism is a type of symbiotic relation-ship where one organism benefits, while the other neither benefits nor is harmed. Barnacles growing on a whale is an example of commensalism. 
  • Question 8
    1 / -0
    Emigration is 
    Solution
    When some individuals of a population move out of a particular area, it is called emigration. Similarly, when some individuals move into a particular area, it is called immigration. Both emigration and immigration are permanent movements.
    So the correct option is C.
  • Question 9
    1 / -0
    A secondary sea anemone gets attached to the shell covering of hermit crab.The association is 
    Solution
    Hermit crabs and sea anemones share an unusual and intimate underwater relationship. Young hermit crabs will often pick up a young sea anemone to attach to their shell and they become partners for life. They even grow at roughly the same rate. Hermit crabs and sea anemones have a symbiotic relationship, meaning they live in harmony together. It’s a stable connection that sidesteps the typical prey and predator relationship found in nature. The type of symbiosis they engage in is called commensalism. Commensalism means one organism benefits and the other organism isn’t harmed by the partnership. Neither the hermit crab nor the sea anemone is negatively affected by their symbiotic and commensalism relationship. The hermit crab gains protection from predators by its relationship with the sea anemone. Since the sea anemone will eat just about anything in the sea, it gets to eat whatever tidbits the hermit crab leaves behind. The hermit crab does the work of capturing dinner and the sea anemone cleans up the leftovers. It’s a steady food supply for the sea anemone.

    So, the correct answer is 'D'.
  • Question 10
    1 / -0
    Interacting populations are 
    Solution
    • Symbiosis is any type of close and long term biological interaction between two different biological organisms which may be mutualistic, commensalistic, or parasitic. Symbiosis is living together of unlike organisms. It is also known as physical attachment, in which the organisms have bodily union known as conjunctive symbiosis.
    • Hence interacting populations are symbiotic i.e they can be mutualistic, parasitic or commensalistic..
    • So, the correct answer is 'Symbiotic',
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