SCIENCE 8
Write 'T' for true and 'F' for false.
1. Yeast is a protozoan.
2. Nitrogen fixation is done by the rhizobium bacteria.
3. Warm and moist conditions are not suitable for the growth of microbes.
4. Vaccines contain weakened or dead disease-causing microorganisms.
5. Some mosquitoes and flies are carriers of disease-causing microbes.
Match the following.
Column A
Column B
1. Alexander Fleming
a. malaria
Answers
Answer:
1) False.
2)True.
3)True.
4) True.
5)True.
Explanation:
1)yeast is not included in Protozoan but in fungi because cell walls is made up of cellulose and reserve food materials as starch.
2)Rhizobium is symbiotic nitrogen fixer bacteria which is found in root nodules of leguminous plants.
3)Thermophilic, or heat-loving, microorganisms experience optimal growth at temperatures greater than 45°C/113°F and up to 100°C/212°F. ... Thus, decreasing temperature and moisture (relative humidity), creates a less hospitable environment for microorganisms to grow.
4)Vaccines are made from microbes that are dead or inactive so that they are unable to cause disease. The antigen in the vaccine is the same as the antigen on the surface of the disease-causing microbe. The vaccine stimulates the body to produce antibodies against the antigen in the vaccine.
5)Housefly and mosquito are the two common insects that act as carriers of disease-causing micro-organisms (or disease-causing microbes). 18. Name any two diseases spread by housefly. The two diseases spread by houseflies are holera and typhoid.
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