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The graph given below represents the eff...

The graph given below represents the effect of sewage discharge of some important characteristics of river

Select the CORRECT option with respect to peaks A and B.

A

Peak A - Sharp increase in BOD , the disappearance of clean water organisms
Peak B - In crease in dissolved oxygen , the reappearance of clean water organisms.

B

Peak A - Increase in dissolved oxygen , the reappearance of clean water organisms.
Peak B - Sharp decline in dissolved oxygen , the disappearance of clean water organisms.

C

Peak A - Sharp increase in BOD , the appearance of clean water organisms.
Peak B - Increases of clean water organisms.

D

Peak A - Increased number of anaerobic bacteria, the disappearance of clean water organisms.
Peak B. Sharp decline in dissolved `O_2` , the reappearance of clean water organisms

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The correct Answer is:
A
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NTA MOCK TESTS-NTA NEET SET 107-BIOLOGY
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  2. The historic convention on Biological Diversity held in Rio de Janeiro...

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  3. Alleles that produce independent effects in their heterozygous conditi...

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  4. The increased productivity of lakes and streams brought about by nutri...

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  5. Most common abiotic pollinating agent for plant is :

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  6. In Andulassian fowl, the heterozygous condition of alleles for black p...

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  7. Identify the mismatched pair in context to eukaryotic transcription.

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  8. Cyclosporine-A: an immunosuppressive agent is produced by the fungus

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  9. Which of the following would necessarily decrease the density of a pop...

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  10. Which one is NOT correctly matched ?

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  11. Species diversity ............as we move away from the ............tow...

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  12. The graph given below represents the effect of sewage discharge of som...

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  13. The functional megaspore referred to as :

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  14. The different gametes produced by an invidual with the genotype of aaB...

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  15. How many of the following statements are true in the context of the sa...

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  16. Out of nutrient cycles sulphur - (a) , phosphorus - (b) , carbon - (c)...

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  17. Dodo, passenger pigeon and Steller's sea cow became extinct in the las...

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  20. What is ploidy of perisperm ?

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