NCERT Solutions for Class 12 Biology Chapter 10
NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare in PDF file format to free download and to Study Online without downloading updated for new academic session 2020-21.NCERT Solutions 2020-2021 for class 12 and notes are also available based on latest Curriculum 2020-21 issued by CBSE. Ask here Whatever in Your mind and Discuss it with your friends and classmates via discussion forum.
NCERT Solutions for Class 12 Biology Chapter 10
|Chapter 10:||Microbes in Human Welfare|
Class 12 Biology Chapter 10 Solutions in English
NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare are given here to download in PDF format free for new academic session 2020-2021. Download NCERT Books 2020-2021 and Offline Apps based on latest CBSE Syllabus 2020-21.
Important Terms related to Chapter 10
1. Baculovirus: Pathogens that attack insects and other arthropods. They are used to kill harmful pests and arthropods e.g., Nucleopolyhedro virus.
2. Flocs: During secondary treatment of effluent, excessive growth of aerobic bacteria and fungi form a mass of mesh like structure called flocs.
3. Bio-fertilisers: Microorganisms which produce fertilisers and enrich the soil e.g., bacteria, cyanobacteria and fungi.
4. Bioactive Molecules: Molecules produced for commercial use from microbes and used for various purposes e. g., Trichoderma polysporum (fungus) is used to obtain immunosuppressive agent cyclosporine-A.
5. Biochemical Oxygen Demand (BOD): Total amount of oxygen consumed by bacteria for oxidation of organic matter present in one litre of water.
More Terms to know
1. Immunosuppressive Agent: Chemicals which suppress the immunity against organ transplant.
2. Organic Farming: Technique of farming, in which bio-fertilisers are used to enrich the soil, without using chemical fertilizers and pesticides to reduce their harmful effect on human health.
3. Biological Control: Reduction of pest population by natural enemies minimising the use of harmful chemical pesticide. E.g. lady bird beetle can eradicate aphids.
4. Thermal vents: The sites deep inside the geysers/hot springs and oceans where the average temp is as high as 100°C.
5. Methanogens: Bacteria producing large quantity of methane during decomposition of organic matter.
GAP: Ganga Action Plan
KVIC: Khadi and Village Industries Commission
TMV: Tobacco Mosaic Virus
YAP: Yamuna Action Plan
IPM: Integrated Pest Management.
Microbes as bio-fertilizers
1. Rhizobium: Have symbiotic association with roots of leguminous plants, help in atmospheric nitrogen fixation.
2. Azospirillum and Azotobacter: Free living in soil and help in nitrogen 2-fixation enrich nitrogen 2-content of soil.
3. Mycorriza: Symbiotic association of fungi with roots of higher plants. Fungi help in absorption of phosphorous from soil. It belong to genus Glomus Provide resistance to root borne pathogens, tolerance to salinity and drought.
4. Cyanobacteria: Found in aquatic or terrestrial environment, help in nitrogen fixation, add organic matter to the soil, increase fertility of soil, e.g., Nostoc, Anabaene, Oscillatoria. In paddy fields, these acts as bio-fertilisers.
Important Questions on 12th Biology Chapter 10
Product: Bread, cake, etc.
Product: Idli, dosa
Product: Dhokla, Khandvi
Bacteria and fungi carry out the process of fermentation and during this process, they release carbon dioxide. Fermentation is the process of converting a complex organic substance into a simpler substance with the action of bacteria or yeast. Fermentation of sugar produces alcohol with the release of carbon dioxide and very little energy.
The dough used for making idli and dosa gives a puffed appearance. This is because of the action of bacteria which releases carbon dioxide. This CO2 released from the dough gets trapped in the dough, thereby giving it a puffed appearance.
Lactic acid bacteria are also found in our stomach where it keeps a check on the disease-causing micro-organisms.
The generation of biogas is an anaerobic process in a biogas plant, which consists of a concrete tank (10−15 feet deep) with sufficient outlets and inlets. The dung is mixed with water to form the slurry and thrown into the tank. The digester of the tank is filled with numerous anaerobic methane-producing bacteria, which produce biogas from the slurry. Biogas can be removed through the pipe which is then used as a source of energy, while the spent slurry is removed from the outlet and is used as a fertilizer.
Rhizobium is a symbiotic bacteria found in the root nodules of leguminous plants.
Azospirillium and Azotobocter are free living nitrogen-fixing bacteria, whereas Anabena, Nostoc, and Oscillitoria are examples of nitrogen-fixing cyanobacteria. Biofertilizers are cost effective and eco-friendly.