This set of Environmental Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Aerobic Treatment of Solid Wastes – Vermiculture”.
1. Which of the following methods uses earthworms during composting?
a) Vermicomposting
b) Vertical composting
c) Windrow composting
d) Burning
View Answer
Explanation: Vermicomposting is a method that uses earthworms during composting by degrading the organic wastes present in the bulk waste material, in vertical reactor, waste flows vertically and that is called as Vertical composting, in windrow composting there is a direct contact between the waste and the atmosphere, whereas, burning is not a composting process.
2. Which of the following is not a major objective of Vermicomposting?
a) To elevate the value of original material
b) To accelerate the rate of degradation
c) To obtain toxic products
d) To obtain products free of any pollutants
View Answer
Explanation: Vermicomposting uses earthworms for composting by degrading the organic wastes present in the bulk waste material by various methods and the major objective is to obtain products free of any pollutants and hence, toxic products are eliminated in the process, and the other two objectives of Vermicomposting are to elevate the value of original material and to accelerate the rate of degradation.
3. Which among the following is not a major reason for choosing earthworms for Vermicomposting?
a) Low incubation time
b) Digestion rate
c) Adaptability
d) Low growth rate
View Answer
Explanation: Low growth rate is not seen in earthworms selected for Vermicomposting as they have a high growth rate, the digestion rate and absorption rate of the consumed food by earthworms is high and they can very well adapt to the changing environmental conditions, that makes them more suitable for Vermicomposting.
4. Which of the following species of earthworms is not suitable for Vermicomposting?
a) Epifilis
b) Endogens
c) Aneciques
d) Plasmodium
View Answer
Explanation: Plasmodium species is a malaria parasite and is not a species of earthworms, whereas, Epifilis, Endogens, Aneciques are the most common species of earthworms used as Vermicomposting earthworms, some with dark pigments and some with uniform coloration having high growth rate, the digestion rate and absorption rate of the consumed food by earthworms is high and they can very well adapt to the changing environmental conditions.
5. Which of the following species has a shorter body size?
a) Epifilis
b) Endogens
c) Aneciques
d) Eudrilus
View Answer
Explanation: Epifilis has a shorter body size with 10-30 cm body size, Endogens can be of larger size as well, Eudrilus vary in size and can be larger as well, most suitable for the Indian climate, Aneciques be found up to 30 cm.
6. Which of the following species is most stable in Indian conditions?
a) Perionyx
b) Epifilis
c) Endogens
d) Aneciques
View Answer
Explanation: Perionyx excavates, species is most stable in Indian conditions for temperate climatic conditions, whereas, Epifilis, Endogens, Aneciques are the most common species of earthworms used as Vermicomposting earthworms, some with dark pigments and some with uniform coloration having high growth rate, the digestion rate and absorption rate of the consumed food by earthworms is high and they can very well adapt to the changing environmental conditions.
7. Which of the following cannot be established properly in the field?
a) Eisenia foetida
b) Perionyx
c) Epifilis
d) Aneciques
View Answer
Explanation: Perionyx, Epifilis, Aneciques cannot be used for Indian conditions and are often properly established in the field, but are the most common species of earthworms used as Vermicomposting earthworms worldwide in comparatively lower temperature conditions, whereas, Eisenia foetida is the best variety of earthworm and can process the organic wastes very efficiently but they cannot be established properly in the field.
8. Earthworms subsidize to the burial of wastes?
a) True
b) False
View Answer
Explanation: In Vermicomposting, the wastes is spread over the soil surface which can be directly acted upon by the Earthworms, which can contribute to the burying of the wastes by degrading the organic wastes present in the wastes which are found in the soil surface. They can eventually lead to the decomposition of the wastes in the soil.
9. Which of the following is not a method of worm cast harvesting or manufacturing?
a) Homogenization
b) Active feeding
c) Drying under adequate light
d) Separation of cocoons
View Answer
Explanation: Homogenization would kill the earthworms as the basic principle is to break it down into simpler molecules, whereas, Active feeding for the growth of earthworms followed by watering the compost which is stopped for few days and is then dried up in the light for a few hours to make the compost ready.
10. What is the major advantage of three-tire vermi-culture technology?
a) It can be applied to both solid and liquid wastes
b) It cannot be applied to both solid and liquid wastes
c) It involves chemical treatment
d) It can degrade organic wastes
View Answer
Explanation: The three-tire vermi-culture technology developed by biotechnology resource center is so inexpensive with respect to the conventional method. Also, the operational costs are negligible. But the major advantage is it can be applied to both solid and liquid wastes. It doesn’t involve chemical treatment and degradation of organic wastes is not a specialty of vermicomposting.
Sanfoundry Global Education & Learning Series – Environmental Biotechnology.
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