ICSE /Class 9
Biology MCQ Based On Harmful role of bacteria
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ICSE Class 9 Biology Harmful role of bacteria
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Bacteria are very small living things that can only be seen with special equipment (a microscope). Bacteria exist in large numbers in air, water, soil, plants and the bodies of people and animals. Some bacteria cause disease
The process of conversion of atmospheric nitrogen into ammonia is called nitrogen fixation. Example of bacteria which have this ability can be Azotobacter and Clostridium.
Bacteria are single celled organism and have no nucleus.
Bacteria are very small living things that can only be seen with special equipment (a microscope). Bacteria exist in large numbers in air, water, soil, plants and the bodies of people and animals. Some bacteria cause disease
Bacteria are very small living things that can only be seen with special equipment (a microscope). Bacteria exist in large numbers in air, water, soil, plants and the bodies of people and animals. Some bacteria cause disease
All the above diseases are caused by bacteria.
Bacteria are very small living things that can only be seen with special equipment (a microscope). Bacteria exist in large numbers in air, water, soil, plants and the bodies of people and animals. Some bacteria cause disease
Bacteria are very small living things that can only be seen with special equipment (a microscope). Bacteria exist in large numbers in air, water, soil, plants and the bodies of people and animals. Some bacteria cause disease
Group of bacteria which are able to synthesize their own food are called Autotrophic bacteria.
Parasites - They obtain their organic food from living cells of plant and animals. Example -Salmonella typhi Sulphur bacteria - These bacteria derives energy by oxidizing hydrogen sulphide. Example - Thiobacillus Symbiotic bacteria - In this two organisms live in close association. Example - Rhizobium Nitrifying bacteria - Ammonia oxidized into nitrate or nitrite. Example - Nitrosomonas
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