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प्रश्न
Observe the figure and write the answers to the questions asked.
- Name the above figure.
- What is it used for?
- Which gas is formed in it?
- How is this gas formed?
- What is done with sewage?
उत्तर
- The given figure represents the Modern landfill site
- It is used for disposal of degradable waste in urban areas.
- Methane gas is formed in landfill pits.
- Microbes present in the soil decompose the waste resulting in the formation of methane gas.
- i. In villages, domestic sewage is disposed of either in nearby soil or in biogas plants, whereas in cities, sewage is carried to a processing unit and acted upon by microbial processes.
ii. This sewage is acted upon by microbes that destroy the pathogens and decompose carbon and xenobiotic compounds in the sewage.
iii. The sludge that settles down in the process can be then used as fertilizer while the water released after microbial treatment is environmentally safe.
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संबंधित प्रश्न
Give scientific reasons.
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Complete the following conceptual picture with respect to uses.
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Garbage is converted into ______ by micro-organisms.
Explain the uses of micro-organisms.
Give reasons.
Soil is turned over during tilling.
Give reasons.
Bread 'rises' during baking.
________ is a substance obtained by microbial processing that functions as an artificial sweetener.
Find an odd one out.
Biodegradable plastic used for storing the garbage.
Match the following.
| Column A | Column B |
| 1) Baker’s yeast | a) Probiotics |
| 2) Sauerkraut | b) Bread |
| 3) Ligases | c) Antibiotics |
| 4) Penicillin | d) Microbial enzyme |
Write a short note.
Bio-fuels
Explain biofuel production with the help of diagram.
Observe the figure and write the answers to the questions asked.
- Write the name of the fungus in the figure above.
- What is the source of these fungi?
- Which organic acid obtained from this organism is used in commercial production?
Match the microorganisms given in the Column A to the group to which they belong in Column B.
| Column A | Column B |
| (a) Lactobacillus | (i) Algae |
| (b) Aspergillus | (ii) Protozoa |
| (c) Spirogyra | (iii) Fungi |
| (d) Paramecium | (iv) Bacteria |
What is retting?
______ bacteria is used for industrial production of yogurt.
In the process of making bread the carbohydrates in the flour are fermented by baker's yeast and sugar is transformed into carbon dioxide and ______.
