Immense increase in the number of organisms of a species is checked by:

Related Mcqs:

1. If organisms are arranged according to predator-prey relationship one always finds more of prey species then of predator. This is called a:

   A. Food web
   B. Pyramid of numbers
   C. Succession
   D. Predator-prey relationship

2. An association between two organisms belonging to different species, which live together for mutual benefit or on partner gets benefit and other, is neither benefited nor harmed is known as:

   A. Predation
   B. Parasitism
   C. Symbiosis
   D. None of these

3. Exotic species, which brought for plantation from some other country to our country or even from one ecosystem to other ecosystem are called, as exotic species like:

   A. Pinus nigra – Japan
   B. Euralyptus – Australia
   C. Polunia – China
   D. All of the above

4. The species characteristics are an expression of the genetic make up of an animal species influencing the extend and nature of ______.

   A. Home range, breeding season
   B. Longevity, territory and the niche
   C. Both (a) & (b)
   D. None of these

5. The vertical layering of organisms corresponds to:

   A. Stratification
   B. Dominance
   C. Physiognomy
   D. Diversity

6. The earth’s atmosphere in which organisms live, is called:

   A. Ecosystem
   B. Ectosome
   C. Biosphere
   D. Bioeconomic

7. The living organisms of all ecosystems collectively constitute:

   A. Producers
   B. Decomposers
   C. Consumers and decomposers
   D. Biosphere

8. In food chain initial organisms are:

   A. Top consumers
   B. Secondary consumers
   C. Primary consumers
   D. Photo synthesizers

9. The back and forth movements of chemical elements, between organisms and environment along characteristic circular paths and known as:

   A. Biochemical cycles
   B. Ecological cycles
   C. Chemical cycles
   D. None of these

10. Which one of the following organisms is used as indicator of water quality?

    A. Beggiota
    B. Chlorella
    C. Azospirillium
    D. Escherichia