Which of the following statements is true about...

Which of the following statements is true about cyanobacteria?
(a) It is found in fresh water only.
(b) It may be unicellular, colonial or filamentous.
(c) They often form bloom in non-polluted fresh water bodies.
(d) Colonies are not surrounded by gelatinous sheath.

Key Concepts

Cyanobacteria

Cyanobacteria are a group of photosynthetic prokaryotes commonly known as blue-green algae. They play a significant role in aquatic ecosystems by contributing to primary production and oxygen generation, and they have a long evolutionary history, including involvement in creating Earth’s early atmosphere.

Morphological Diversity

Cyanobacteria exhibit remarkable morphological diversity, existing in forms that are unicellular, colonial, or filamentous. This diversity aids in their adaptation to various environmental conditions and influences their reproduction and survival strategies.

Habitat Versatility

Rather than being restricted to one type of water body, cyanobacteria are found in a wide range of habitats including fresh water, marine environments, and even terrestrial environments. Their adaptability allows them to thrive under various environmental conditions.

Bloom Formation

Cyanobacterial blooms are rapid proliferations that often occur in nutrient-rich, polluted water bodies. These blooms can have significant ecological and economic impacts, such as producing toxins harmful to aquatic life, animals, and humans.

Extracellular Gelatinous Sheaths

Many cyanobacteria produce extracellular gelatinous sheaths that surround their cells or filaments. These sheaths provide protection against environmental stress and help in colony formation, playing a key role in their survival and ecological interactions.

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