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

Related Mcqs:

1. Escherichia coli is used as an indicator organism to determine pollution of water with:

   A. Heavy metals
   B. Faecal matter
   C. Industrial effluents
   D. Pollen of aquatic plants

2. The high amount of E. coli in water in the indicator of:

   A. Hardness of water
   B. Industrial pollution
   C. Sewage pollution
   D. Presence of chlorine in water

3. Common indicator organism of water pollution is:

   A. Eichhornia crassipes
   B. Escherichia coli
   C. Entamoeba histolytica
   D. Lemna pancicostata

4. Main indicator of soil erosion is:

   A. Deforestation
   B. Afforestation
   C. Ozone layer
   D. Goats and grazing animals

5. 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

6. 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)

7. 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

8. 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

9. 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

10. The vertical layering of organisms corresponds to:

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