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ENVIRONMENTAL ISSUES
Monday, March 22, 2021
Organisms and Populations | Class 12 Botany | Sample Questions and Answers
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ORGANISMS AND POPULATIONS
Biotechnology-Applications | Class 12 Botany | Sample Questions and Answers
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BIOTECHNOLOGY - APPLICATIONS
Biotechnology-Principles and Processes | Class 12 Botany | Sample Questions and Answers
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BIOTECHNOLOGY- PRINCIPLES AND PROCESSES
Strategies for Enhancement in Food Production | Class 12 Botany | Sample Questions and Answers
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STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
Sexual Reproduction in Flowering Plants | Class 12 Botany | Sample Questions and Answers
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SEXUAL REPRODUCTION IN FLOWERING PLANTS
Biodiversity and Conservation | Class 12 | Sample Questions and Answers
BIODIVERSITY AND CONSERVATION
QUESTIONS
1 Score Questions
1. ………………… popularized the term ‘biodiversity’.
Reproduction in Organisms | Class 12 Botany | Sample Questions and Answers
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REPRODUCTION IN ORGANISMS
Microbes in Human Welfare | Class 12 | Sample Questions and Answers
MICROBES IN HUMAN WELFARE
QUESTIONS
1 Score Questions
1. The bacteria that can convert milk to curd is
a. Acetobacter acetib. Lactobacillusc. Clostridium butylicumd. Streptococcus
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: EthanolClostridium butylicum: …………….
5. Name 2 enzymes used to clarify bottled juices.
6. Cyclosporin A is produced by................
6. Cyclosporin A is produced by................
a. Aspergillus nigerb. Clostridium tetanic. Trichoderma polysporumd. Acetobacter aceti
7. Penicillin is the first antibiotic discovered by …………….
8. The main ingredient of Biogas is
8. The main ingredient of Biogas is
a. Ethaneb. Hydrogen sulphidec. Methaned. Carbon dioxide
9. Select a bio-control agent from the given microbe.
a. Trichodermab. Rhinovirusc. Saccharomycesd. Streptococcus
10. The nitrogen fixing symbiotic bacteria in root nodules of leguminous plants is
a. Azotobacterb. Azospirillumc. Clostridiumd. Rhizobium
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:
12. Match the column B & C with respect to A.
|
A |
B |
C |
|
Cyanobacteria |
Biocontrol |
Antibiotic |
|
Baculoviruses |
Penicillin |
Biofertilizer |
|
Penicillium notatum |
Anabaena |
IPM
programme |
13. Complete the table given below:
|
Bioactive
molecule |
Source |
Medical
importance |
|
a |
Streptococcus |
Removes clots from blood
vessels |
|
Cyclosporine-A |
b |
c |
|
d |
Monascus purpureus |
Blood cholesterol lowering
agent |
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/LSample 2: 80mg/LSample 3: 300mg/LSample 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:
|
Methanogens |
Aspergillus niger |
|
Flocs |
Aerobic microbes |
|
Citric acid |
Anaerobic microbes |
|
Baker’s yeast |
Lactobacillus |
|
|
Saccharomyces cerevisiae |
(b) Give two examples for biofertilizer.
ANSWERS
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.
12.
13.
|
A |
B |
C |
|
Cyanobacteria |
Anabaena |
Biofertilizer |
|
Baculoviruses |
Biocontrol |
IPM
programme |
|
Penicillium notatum |
Penicillin |
Antibiotic |
a. Streptokinaseb. Trichoderma polysporumc. Immunosuppressive agentd. Statins
14. Aspergillus niger (a fungus) : Citric acid.
Acetobacter aceti (a bacterium) : Acetic acid.
15.
Acetobacter aceti (a bacterium) : Acetic acid.
15.
a. Yes. It is a measure of organic matter present in the water. Greater BOD means water is more polluted.b. Biochemical Oxygen Demand.
16.
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.
17.
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.
19.
|
Methanogens |
Anaerobic microbes |
|
Flocs |
Aerobic microbes |
|
Citric acid |
Aspergillus niger |
|
Baker’s yeast |
Saccharomyces cerevisiae |
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.
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