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Biochemical oxygen demand (BOD) in a riv...

Biochemical oxygen demand (BOD) in a river water

A

Increases when sewage gets mixed with river water

B

Remains unchanged when algal bloom occurs

C

Has no relationship with concentration of oxygen in the water

D

Gives a measure of salmonella in the water

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The correct Answer is:
A
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MOTION-ECOLOGY-EXERCISE -3
  1. The correct sequence of plants in a hydrosere is

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  2. Steps taken by the Government of India to control air pollution includ...

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  3. Biochemical oxygen demand (BOD) in a river water

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  4. DDT residues are rapidly passed through food chain causing biomagnific...

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  5. Global agreement in specific control strategies to reduce the release ...

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  6. Tiger is not a resident in which one of the following national park

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  7. The biomass available for consumption by the herbivores and the decomp...

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  8. Which one of the following is one of the characteristics of a biologic...

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  9. Which one of the following is an example of ex-situ conservation?

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  10. A renewable exhaustible natural resource is

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  11. The two gases making highest relative contribution to the greenhouse g...

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  12. Select the correct statement from the following :

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  13. Which two of the following changes (A-B) usually tend to occur in the ...

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  14. dB is a standard abbreviation used for the quantitative expression of

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  15. Study the four statement (i-iv) given below and select the two correct...

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  16. The figure given below is a diagrammatic representation of response of...

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  17. Which of the following representations shows the pyramid of numbers in...

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  18. Which one of the following is a xerophytic plant in which the stem is ...

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  19. When domestic sewage mixes with river water

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  20. Which one of the following is most appropriately defined?

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