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Organisms and Populations Test - 31

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Organisms and Populations Test - 31
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  • Question 1
    1 / -0
    Forests near equator region are called as
    Solution
    Tropical rain forests can be found in equatorial regions of central and south America, west-central Africa, and southeast Asia, including New Guinea and the northeastern coast of Australia. Tropical rain forests support a wide variety and number of plants, animals, and microorganisms, and represent the highest peak of ecosystem development on Earth.
  • Question 2
    1 / -0
    A biotic relationship between two different organisms in which one receives benefit at the cost of the other's life is called as
    Solution
    An ecosystem is composed of biotic and abiotic components of the environment which interact with each other for mutual benefit. Predation is a biological interaction where one species feeds on the other species. It is a process of major importance in influencing the distribution, abundance, and diversity of species in ecological communities. Generally, successful predation leads to an increase in the population size of the predator and a decrease in population size of the prey. These effects on the prey population may then ripple out through the ecological community, indirectly changing the abundances of other species. 
  • Question 3
    1 / -0
    The maximum growth rate occurs in
    Solution

    Solution:

    • Correct answer is option C 

    • Explanation for the correct option
    • Exponential phase or log phase is phase where maximum growth takes place in population. 
    • Maximum growth is seen here because of availability of food and requirements are in plenty amount and there is no competition in exponential phase
  • Question 4
    1 / -0
    Which ecosystem has maximum number of producers in an unit area?
    Solution
    A forest is a region which contains dense flora and is the home for an enormous variety of fauna. It contains a diverse range of producers which includes herbs, shrubs, and trees which are highly productive and contributes to large biomass.
    So, the correct answer is option C.
  • Question 5
    1 / -0
    Most successful parasites are those which do not 
    Solution

    A parasite is an organism that depends on another organism, known as a host, for food and shelter. A parasite usually gains all the benefits from this relationship and kill the host cell. But the some of the parasites which benefit from the host do not kill the host. Example stem parasites in plants.Therefore, the correct answer is option B.

  • Question 6
    1 / -0
    Choose the correct sequence of stages of growth curve for Bacteria.
    Solution
    Four characteristic phases of the growth cycle are: 
    1. Lag phase- immediately after inoculation of the cells into fresh medium, where the synthesis of enzymes, proteins, RNA takes place.
    2. Exponential (log) phase- where all the cells are dividing regularly by binary fission and are growing by geometric progression. The cells divide at a constant rate depending upon the composition of the growth medium and the conditions of incubation. 
    3. Stationary phase- exponential growth cannot be continued forever in a culture. Population growth is limited by one of three factors: exhaustion of available nutrients; accumulation of inhibitory metabolites or end products; exhaustion of space, (called a lack of biological space). 
    4. Death phase- if incubation continues after the population reaches stationary phase, a death phase follows, in which the viable cell population declines. 

  • Question 7
    1 / -0
    Acacia, Prosopis and Capparis belongs to 
    Solution
    The Northwestern thorn scrub forests are tropical dry forests, that have been degraded through intensive agriculture and grazing into stunted and open thorn scrub, dominated by trees, such as Acacia senegal and Acacia leucophloea, as well as Prosopis cineraria, Capparis zeylanica, and species of Salvadora, Gymnosporia, Grewia, and Gardenia.
  • Question 8
    1 / -0
    What will be happen if the number of organism is increased at a place?
    Solution
    If number of organisms increased at a specific place, the intra species competition will be increased as members of the same species compete for limited resources which leads to a reduction in fitness for both individuals. Increase of the number of organisms will also increase Inter species competition which occurs when members of different species compete for a shared resource. 
    Therefore, the correct answer is option C.
  • Question 9
    1 / -0
    Which one of the following ecosystem has the highest primary productivity?
    Solution
    Forests generally have the highest primary productivity, generating the highest amount of organic matter each year. Trees are large and their many leaves can trap and use a great deal of sunlight. 
    Therefore, the correct answer is option D.
  • Question 10
    1 / -0
    Decrease in number of trees may cause 
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