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The green scum seen in the freshwater bo...

The green scum seen in the freshwater bodies is

A

blue green algae

B

red algea

C

green algae

D

Both (b) and ( c)

Text Solution

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The green scum seen in the fresh water bodies mainly consists of green algea and blue - green algae, while the red algae is mostly marine.
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NCERT EXEMPLAR-ENVIRONMENTAL ISSUES -Environmental Issues
  1. Choose the incorrect statement.

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  2. Among the following which one causes more indoor chemical pollution ?

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  3. The green scum seen in the freshwater bodies is

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  4. The loudness of a sound that a person can withstand without discomfort...

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  5. The major source of noise pollution, world wide is due to:

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  6. Match correctly the following and choose the correct option. {:("Env...

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  7. Catalytic converters are fitted into automobiles to reduce emission of...

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  8. Why is it necessary to remove sulphur from petroleum products ?

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  9. Which one of the following impuritites is easiest to remove from waste...

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  10. Which one of the following diseases is not due to contamination of wat...

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  11. Nuisance growth of aquatic plants and bloom-forming algae in natural w...

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  12. Algal blooms impart a distinct colour to water due to

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  13. Match the items in column I and column II and choose the correct optio...

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  14. In the textbook you came acroos Three Mile Island and Chernobyl disast...

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  15. Use of lead- free petrol or diesel is recommended to reduce the pollot...

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  16. In which year was the Air (Prevention and Control of pollution) Act am...

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  17. Name the city in our country where the entire public road transport ru...

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  18. It is a common practice to undertake of the overhead water tanks. What...

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  19. What is cultural eutrophicetion?

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  20. List any two adverse effects of particulate matter on human health.

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