Causes of water bloom is :-a)Green algaeb)Blue green algaec)Bacteriad)HydrillaCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Blue-green algae are microscopic, plant-like organisms that occur naturally in ponds, rivers, lakes and streams. Although often blue-green, they can also be olive-green or red.

Blue-green algae are not normally visible in the water, but populations can rapidly increase to form a large mass or scum called a bloom when conditions are favourable.

Blooms most commonly occur in late summer and early fall. They thrive in areas where the water is shallow, slow moving and warm, but they may be present in deeper, cooler water.

Dense blue-green algae blooms may make the water look bluish-green, or like green pea soup or turquoise paint. Very dense blooms may form solid-looking clumps.

Fresh blooms often smell like newly mown grass, while older blooms may smell like rotting garbage.

Answer

Blue green algae like microcysts, cause water bloom

Answer

These are a result of blue-green algae, which are actually bacteria (cyanobacteria). Some algal blooms are the result of an excess of nutrients (particularly phosphorus and nitrogen) into waters and higher concentrations of these nutrients in water cause increased growth of algae and green plants.

Answer

Blue green algae or cynobacteria help in nitrogen fixation and hydrilla causes water bloom

Answer

Blue green algae(Cyanobacteria) causes blooms in water.The red color of red sea is due to Trichodesmium erythraeum present in it.....

Answer

Causes of Water Bloom: Blue-Green Algae

Blue-green algae, also known as cyanobacteria, are a common cause of water bloom. These organisms are a type of bacteria that possess both plant-like and bacteria-like characteristics. They are photosynthetic, meaning they can produce their own food through photosynthesis, similar to plants. Blue-green algae are often found in freshwater environments such as lakes, ponds, and slow-moving rivers.

1. Nutrient Enrichment:
One of the main factors contributing to the growth of blue-green algae is nutrient enrichment, specifically high levels of phosphorus and nitrogen in the water. These nutrients come from various sources, including agricultural runoff, sewage discharge, and the decomposition of organic matter. When nutrient levels are high, blue-green algae can rapidly multiply and form dense colonies, leading to water bloom.

2. Warm Water Temperatures:
Blue-green algae thrive in warm water temperatures. They are most active and grow rapidly when the water temperature is between 20-30°C (68-86°F). Warmer temperatures provide optimal conditions for their growth and reproduction.

3. Still or Slow-Moving Water:
Blue-green algae prefer still or slow-moving water bodies where they can accumulate and form visible blooms. Calm waters allow the algal cells to remain suspended near the surface, where they can receive abundant sunlight for photosynthesis.

4. Low Light Penetration:
Blue-green algae can outcompete other algae and aquatic plants because they are better adapted to low light conditions. Their ability to photosynthesize even in low light gives them a competitive advantage in water bodies with reduced light penetration due to high algal densities or turbidity.

5. Algal Toxins:
Some species of blue-green algae produce toxins known as cyanotoxins. These toxins can have harmful effects on humans, animals, and aquatic life. They can cause skin irritation, respiratory problems, gastrointestinal issues, and even liver damage if ingested or exposed to for prolonged periods.

Conclusion:
Blue-green algae, or cyanobacteria, are a common cause of water bloom. Nutrient enrichment, warm water temperatures, still or slow-moving water, low light penetration, and the production of algal toxins are some of the key factors contributing to the growth and proliferation of blue-green algae in freshwater environments. Understanding these causes can help in developing strategies to prevent and manage water bloom events.

Similar NEET Doubts

Which of the following statements is not correct regarding algal blooms?

Presence of large amount of nutrients in water also causes excessive growth of planktonic (free floating) algae,called an a. Fungal bloom b. Algin c. Algal bloom d. BOD?

Which type of algea is mostly present in deep oceans ?

Which algal group have similarity in pigment composition a Red algae and brown algae b Green algae and blue green algae c kelps and diatoms d diatoms and euglenoid. ?

Which one of the following statements is wrong? [2016]

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