Q) Algal bloom in polluted water body is formed by -
1) Archaebacteria
2) Cyanobacteria
3) Chemosynthetic bacteria
4) Heterotrophic bacteria

The bacteria forming blooms in polluted water bodies are nutritionally

[A] : Algal blooms deplete dissolved O_(2) levels in polluted water bodies . [R] : Bioproductivity of water bodies increases due to algal blooms .

Which of the following statements are true about heterocyst? 1. They are formed in blue - green algae. 2. Heterocysts are nitrogen - fixing cells. 3. Heterocyts are formed during nitrogen starvation . 4. Anabaena and Nostoc are examples of heterocyst forming bacteria.

Algal bloom cause a. fish mortality. b. deterioration of water quality. c. increased oxygen in water body. d. control of water pollution.

Match the lists {:(,"I" ,,"II"),(,(a),"Nitrosomonas",(1)"Denitrifying bacteria "),(,(b),"Nitrobacter",(2)"Soil bacteria"),(,(c),"Pseudomonas",(3) "Nitrate bacteria"),(,(d),"Azotobacter",(4)"Nitrite bacteria"):}