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Biological Classification — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYBiological Classification2 Marks
Question
Mention two harmful effects of cyanobacteria.
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Answer

Cyanobacteria have the following harmful effects:
  1. They discolour the walls and roofs of buildings.
  2. Excessive growth in water bodies decreases oxygen levels, thereby killing aquatic animals.

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