Class 8 Microorganisms Friend And Foe Short Answer Questions

Class 8 Microorganisms Friend And Foe Short Answer Questions 

1.Unscramble the jumbled words underlined in the following statements.
(a) Cells of our body produce santiidobe to fight pathogens.

(b) curbossulite is an air-borne disease caused by a bacterium.

(c) Xanrhat is a dangerous bacterial disease.

(d) Yeasts are used in the wine industry because of their property of meronettinaf.
2. Suggest a suitable word for each of the following statements. (
a) Chemicals added to food to prevent growth of microorganisms. (b) Nitrogen-fixing microorganism present in the root nodules
of legumes.
(c) Agent which spreads pathogens from one place to another.
(d) Chemicals which kill or stop the growth of pathogens. 3. Name one commercial use of yeast.
4. Name the process in yeast that converts sugars into alcohol.
5. In the soil, which nutrient is enriched by blue-green algae (cyanobacteria)?
6. Why should we avoid standing close to a tuberculosis patient while he/she is coughing?
7.Name the persons who discovered following things a.Pencillin b.Fermentation. C. Vaccination
8.Name two diseases that are caused by virus.
9.Write one important characteristic of virus
10.Classify the following into friendly and harmful microorganisms.
Yeast, malarial parasite, Lactobacillus, bread mould, Rhizobium, Bacillus anthracis
11.The two micro-organisms which live in symbiotic association in lichens are
12.The gas released during the preparation of bread is
13.he group of microorganisms where all members c ontain chlorophyll is:
14.Introduction of weak or dead microbes is known as
15.When a disease causing microbe enters into our body, defense system produces
16.Give any one example of Antibiotic
17.The process of heat and cold treatment of milk is
18.A microorganism without cellular structure