8. Define the following. (a) Chlorination (b) Algal bloom (e) Leaching (f) Clarified water (c) Dewatering (d) Incineration (g) Vermi-composting
Answers
Answer:
Which of the following chemicals is used for protecting vermi-bed from ants?
(a) DDT
(b) Griseofulvin
(c) Chloramphenicol
(d) Chlorpyriophosphate
Sol.(d) Chlorpyriophosphate.
Which of the following is a commonly used earthworm species for the vermicomposting process?
(a) Eisenia fetida
(b) Perionix excavatus
(c) Both (a) and (b)
(d) None of the above
Sol. (c) Both (a) and (b).
The highly decomposed organic matter rich in minerals like nitrogen, phosphorus, and potassium, in particular, produced from the activity of earthworms is called ________.
(a) Humus
(b) Vermicompost
(c) Worm casting
(d) Compost bedding
Sol.(b) Vermicompost.
Vermicompost is used as a biofertilizer because it is rich in__________.
(a) Calcium
(b) Nitrogen
(c) Phosphorus
(d) All of the above
Sol.(d) All of the above.
Which of the following is false about vermicomposting?
(a) Worms population doubles in 90 days
(b) Worms eat double their body weight
(c) The wooden bin is best for vermicomposting
(d) Red worms are the best for vermicomposting
Sol. (b) The worms eat double their body weight.
Which of the following is true about vermicomposting?
(a) Composting using rats
(b) Composting using birds
(c) Composting using worms
(d) All of the above
Sol. (c) Composting using worms.
Which of the following is true about vermicompost?
(a) Vermicompost is red in colour
(b) Vermicompost is black in colour
(c) Vermicompost is white in colour
(d) Vermicompost is brown in colour
Sol. (d) Vermicompost is brown in colour.
Which of the following are the best worms used for composting?
(a) Maggots
(b) Pink worms
(c) Red wigglers
(d) All of the above
Sol. (c) Red wigglers.
The moisture level required for vermicomposting should be between _______.
(a) Below 30 per cent
(b) 40 and 50 per cent
(c) 70 and 80 per cent
(d) Above 90 per cent
Sol. (c) 70 and 80 per cent.
The maximum temperature required for vermicomposting is_______.
(a) 20C to 25C
(b) 25C to 30C
(c) 30C to 35C
(d) 35C to 40C
Sol.(c) 30C to 35C.
Which of the following is not a drawback of vermicomposting?
(a) Time-consuming process
(b) Require regular monitoring
(c) Require minimum temperature
(d) Enriches soil with microorganisms
Sol. (d) Enriches soil with microorganisms.
Which of the following is not raw material required for preparing composts?
(a) Cow dung
(b) Weed biomass
(c) Dry straw and leaves
(d) All of the above
Sol. (d) All of the above.
Which of the following procedures are used by the farmers to multiply the earthworms?
(a) By adding cow dung
(b) By adding plant materials
(c) By mixing more amount of biodegradable wastes
(d) All of the above
Sol. (d) All of the above.
Which of the following products cannot be used for vermicomposting?
(a) Cow dung
(b) Plant materials
(c) Animal Wastes
(d) All of the above
Sol. (c) Animal Wastes.
Answer:
An algal bloom can result in foul-smelling scum, foam, froth, or a paint-like slick, depending on the type of bacteria or algae that cause it.
Explanation:
What is meant by chlorination, Algal bloom, Dewatering, Incineration, Leaching, Clarified water, Vermi-composting ?
(a) To kill bacteria, viruses, and parasites in drinking water, chlorine is added as part of the chlorination process. To achieve safe chlorine levels in drinking water, various techniques can be used.
(b) A bloom of microscopic algae or bacteria that resemble algae occurs in fresh, salt, or brackish waters. An algal bloom can result in foul-smelling scum, foam, froth, or a paint-like slick, depending on the type of bacteria or algae that cause it.
(c) Dewatering is the term for the removal of groundwater or surface water from places like construction sites. To enable excavation in dry and stable conditions below the natural groundwater level during construction, water is temporarily pumped from wells or sumps to temporarily lower groundwater levels.
(d) A waste treatment method called incineration involves burning the substances found in waste. The term "waste-to-energy facilities" is frequently used to describe industrial facilities for the incineration of waste. Thermal treatment includes incinerators and other high-temperature waste disposal methods.
(e) Leaching is the procedure by which a solute is separated from or extracted from its carrier substance using a solvent. Leaching is a naturally occurring process that scientists have modified using a wide range of techniques for a variety of applications.
(f) Water that has been clarified to remove suspended solids and solid particles is referred to as clarified water. Prior to further purification, drinking water must be pre-treated. Industrial effluent and municipal wastewater must also be treated using water clarification.
(g) An easy technique for turning biodegradable waste into organic manure with the aid of earthworms is vermicomposting, also known as worm composting. Farmers appreciate earthworms because, in addition to aerating the soil, they digest organic matter and create castings, which are an important source of humus.
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