2.Swiss cheese has large holes due to the production of CO2 by ………………… 3.The chemical substances produced by some microbes and can kill the pathogens are known as ……………. 4.Note the relationship between first two words and fill up the fourth place.
Saccharomyces cerevisiae: Ethanol
Clostridium butylicum: …………….
5.Name 2 enzymes used to clarify bottled juices. 6.Cyclosporin A is produced by................
a. Aspergillus niger
b. Clostridium tetani
c. Trichoderma polysporum
d. Acetobacter aceti
7.Penicillin is the first antibiotic discovered by ……………. 8.The main ingredient of Biogas is
b. Hydrogen sulphide
d. Carbon dioxide
9.Select a bio-control agent from the given microbe.
10.The nitrogen fixing symbiotic bacteria in root nodules of leguminous plants is
2 Score Questions
11.Lactic acid bacteria are beneficial microbe for our health. Justify this statement pointing two examples. 12.Match the column B & C with respect to A.
13.Complete the table given below:
Removes clots from blood
Blood cholesterol lowering
14.Many microbes are acid producers. Name any two such microbes and acids produced by them.
15.“BOD is an index of water pollution”
a. Do you agree with this statement? Justify.
b. Expand BOD.
16.BOD of some water sample is given below.
Sample 1: 200mg/L
Sample 2: 80mg/L
Sample 3: 300mg/L
Sample 4: 25mg/L
a. Which of above water sample is most polluted?
b. What is meant by flocs? Mention its role in sewage treatment.
17.Expand: (a) IARI (b) KVIC. 18.Microbes can be considered as a source of energy. Substantiate with an example. 19.Match the following:
20.(a) What are the advantages of biofertilizers over chemical fertilizers? (b) Give two examples for biofertilizer.
1.(b) Lactobacillus 2.Propionibacterium sharmani. 3.Antibiotics 4.Butyric acid 5.Pectinases & Proteases. 6.(c) Trichoderma polysporum 7.Alexander Fleming 8.(c) Methane 9.(a) Trichoderma 10.(d) Rhizobium 11.Lactic acid bacteria (LAB) increase vitamin B12 in curd. Also, it helps to check pathogens in stomach.
b. Trichoderma polysporum
c. Immunosuppressive agent
14.Aspergillus niger (a fungus) : Citric acid. Acetobacter aceti (a bacterium) : Acetic acid.
a. Yes. It is a measure of organic matter present in the water. Greater BOD means water is more polluted.
b. Biochemical Oxygen Demand.
a. Sample 3.
b. Flocs are aerobic bacteria associated with fungal filaments to form mesh-like structures. They consume the organic matter in the effluent reducing its BOD.
a) Indian Agricultural Research Institute.
b) Khadi and Village Industries Commission.
18.This statement is true. Because microbes such as Methanogens can be used to produce biogas. Biogas is an important energy source.
20.(a) Chemical fertilizers are harmful to the soil and beneficial organisms. Biofertilizers have no such problems. They can maintain the nature and quality of soil. (b) Rhizobium, Mycorrhiza.