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

Related Mcqs:

1. The study of interaction between living organisms and environment in a specific area is the study of:

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

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

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

3. 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

4. The transfer of food energy from the sources in plants through a series of organisms with repeated stages of eating and being eaten is known as:

   A. Food way
   B. Food web
   C. Food link
   D. Food chain

5. Study of relationship between communities and environment is called:

   A. Autecology
   B. Ethology
   C. Ecology
   D. Syncology

6. In an aquatic environment, microscopic animals and plants are collectively known:

   A. Commensals
   B. Herbivores
   C. Fauna and flora
   D. Planktons

7. A chemical, which kills the weeds, is known as:

   A. Insecticide
   B. Pesticide
   C. Herbicide
   D. Germicide

8. Which group of three living organisms, given below is a link in food chain: Green plants …. Hawk:

   A. Grasshopper, frog, snake
   B. Grasshopper, rat, snake
   C. Millipedes, centipedes, sparrow
   D. Earthworm, hen, rat

9. 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)

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

    A. Environmental resistance
    B. Biotic potential
    C. Imigration
    D. All of these