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

Related Mcqs:

1. 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

2. The lower most layer of atmosphere in which man and other living organisms exist is called:

   A. Thermosphere
   B. Mesosphere
   C. Stratospheres
   D. Troposphere

3. All the living organisms on the earth interacting with atmosphere constitute:

   A. Biosphere
   B. Community
   C. Biome
   D. Association

4. 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

5. When the number of organisms at successive levels are plotted, they assume the space of a pyramid. This is called the pyramid of:

   A. Energy
   B. Number
   C. Biomass
   D. Both (a) and (c)

6. The study of interactions between living organisms and environment is called:

   A. Ecosystem
   B. Phytogeography
   C. Ecology
   D. Phytosociology

7. A striking example of ______ is that of a ruminant animal such as a cow and the bacteria that live in its gut:

   A. Parasitism
   B. Commensalism
   C. Mutualism
   D. None of these

8. An animal which captures and readily kills live animals for its food is known as:

   A. Predator
   B. Parasite
   C. Symbionts
   D. None of these

9. The living organisms of all ecosystems collectively constitute:

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

10. In food chain initial organisms are:

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