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Organisms and Populations Test - 50

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Organisms and Populations Test - 50
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  • Question 1
    1 / -0
    Types of interaction that occur in predation and parasitism are 
  • Question 2
    1 / -0
    A successful parasite is the one which 
    Solution
    Parasites are the organisms that live inside the host and  take away their nutrition from the host. Thus they derive benefit from the host and harm them in this process. A good host creates minimum damage to its host.
    So, option D is the correct answer.
  • Question 3
    1 / -0
    Sigmoid curve is 
    Solution
    Sigmoid curve is a S shaped curve. it represents the growth of a population. It determines the increase in population and time period on two of its axis.
    So, option D is the correct answer.
  • Question 4
    1 / -0
    A rocky area, once bare, is now a green forest . The sequence of succession has 
    Solution
    The process of succession from a bare rock to a green forest is known as Xerarch or Xerosere. It involves a lot of stages, namely:
    1. Crustose lichen stage : Crustose are forms an external protective layer on the surface of the rock. Special types of lichens can grow on ,these rocks. The lichens are called crustose lichens. Examples: Licanora, Rhinodina, etc.
    1. Foliage lichen stage: Crustose lichens helps in the formation of foliage lichens. THey are leaf like structures which retains water and maintains moisture on the rock. Examples: Parmelia, Dermaticarpo, etc.
    1. Moss stage :The soil becomes more porous leading to the growth of mosses.They penetrate more in to the soil and helps for the growth of herbaceous plants. Examples: Polyerichum, Tornda, etc.
    1. Herbaceous (plant) stage: Due to the increases water and hummus, herbaceous plants are grown. Evaporation or transpiration starts taking place. Now bacteria, fungi and other animalscan be found here. Examples: perennial herbs and grass. 
    1. Shrub stage: Soil is now favourable for shrubs. They grow and become dense. Examples: Rhus, etc.
    1. Climax stage:  Now the soil allows the growth and establishment of woody plants with dense roots. Later, they are changed into woody forests.
  • Question 5
    1 / -0
    Association between entomophilous flowers and pollinating agent is 
    Solution
    Flowers which are pollinated by insects are called insect pollinated flowers. In this type of pollination, the insects suck nectar from the flower. In turn, they take away their pollen grains and deposit them over other flower's stigma. Thus, both the plants and insects are mutually benefited and the interaction is called mutualism.                
    So, option C is the correct answer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
  • Question 6
    1 / -0
    Population density of terrestrial organisms is measured in terms of individuals per _____________. 
    Solution
    • How many organisms there are per unit area is referred to as density.
    Population density is a measurement of population size per unit area, i.e., population size divided by total land area.
    • and we normally measure the area in meter square. so option B is the correct answer 
  • Question 7
    1 / -0
    Natality is 
    Solution
    • Natality and mortality are two terms that detention the population of a particular location. 
    • Natality indicates the increase in the number of individuals in a given population, at a particular time. 
    • Mortality indicates the death of the individual at a particular time.
    So, option B is the correct answer.
  • Question 8
    1 / -0
    Phase of population growth having equal natality and mortality is
    Solution
    When the birth rate and the death rate become equal, the population stops growing and attains a stage of equality. This is called the plateau phase of population growth.
    So, option B is the correct answer.
  • Question 9
    1 / -0
    Killing an organism for feeding is
    Solution
    Living organisms live by forming various food chains. Int his food chain, one organism eats another and thus the balance in the natural cycle is retained. When one organism feeds on another organism, the process is called predation.
    So. Option A is the correct answer.
  • Question 10
    1 / -0
      Column I  Column II
     (i) Mutualism (p) Beneficial to a, no effect for b
     (ii) Competition (q) Be neficial to both a and b
     (iii) Parasitism (r) Beneficial to a and inhibitory for b
     (iv) Predation (s) Beneficial to a and harmful for b
     (v) Commensalism (t) Harmful to both a and b
    March the columns and choose the correct combination

    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 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.
    So the correct option is C.
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