CIE Biology Paper-4: Specimen Questions 66 - 67 of 120
Question number: 66
Match some diseases and their confirmatory tests?
|List-Ⅰ ( |
|List-Ⅱ ( |
R. A Factor
Lepromin skin test
Here Diasease and Test to match each other.
so here schich test is a Diphtheria. Diphtheria is an infection caused by the bacterium Corynebacterium diphtheriae
and widal Test: - Typhoid Typhoid fever, also known simply as typhoid, is a bacterial infection due to Salmonella typhi that causes symptoms.
Tourniquet Test: - Dengue fever Dengue fever (breakbone fever) is a disease transmitted by a mosquito bite.
R. A Factor: -Rheumatoid Arthritis, Rheumatoid arthritis (RA) is a long lasting autoimmune disorder that primarily affects joints.
Lepromin skin test: - Leprosy, Leprosy, also known as Hansen’s disease (HD), is a chronic infection caused by the bacteria Mycobacterium leprae and Mycobacterium lepromatosis
Question number: 67
Describe in Detail
What is the microbial ecology of the nitrogen cycle?
The nitrogen cycle is the conversion of nitrogen into its different forms by the use of microorganisms. In nitrogen fixation, atmospheric nitrogen is fixed to be used by plants. It is done by many symbiotic bacteria (diazotrophs). These bacteria have nitrogenase enzyme that combines with N2 gas with hydrogen to produce ammonia. Rhizobium and azotobactors are the example of it.
Here they form a mutualistic relationship with the plant, producing ammonia in exchange for carbohydrates. Sometimes bacteria or fungi convert the organic nitrogen within the remains back into ammonium (NH4+), a process called ammonification and the process of conversion of ammonia to nitrate is also done by soil-living bacteria such as nitrobacterium. Nitrification process is performed by bacterial species such as pseudomonas and clostridium.