Waste Generation and Management ICSE Class-9 Selina Boilogy
Revised Concise Biology Chapter-19 Waste Generation and Management
Waste Generation and Management ICSE Class-9 Selina Concise Boilogy Chapter-19 .We Provide Step by Step Answer of Progress Check , MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type Questions of Exercise-19 Waste Generation and Management. Visit official Website CISCE for detail information about ICSE Board Class-9
Waste Generation and Management ICSE Class-9 Concise Selina Boilogy Chapter-19
–: Select Topics :–
Note :- Before Viewing Concise Selina Solutions of Waste Generation and Management Chapter-19 . Read the whole chapter carefully with figure. Focus on Following Points.
Important of Chapter-19 Waste Generation and Management
Source of waste – domestic , industrial , agriculture , commercial
Domestic waste : paper, glass ,plastic , rags, kitchen waste , etc
Industrial : Mining operation , cements factories , oil refineries , construction unit.
Agriculture : plant remain , animal waste , processing waste.
Municipal sewage: Sewage , degradable and non degradable waste from office , etc.
E-waste: brief idea about e-waste
Method of safe disposal of waste : Segregation , dumping , composting , drainage , treatment of effluents before discharge , incineration , use of scrubbers and electrostatic precipitatiors.
Segregation of domestic waste into biodegradable and non- biodegradable by household , garden waste to be converted to compost; sewage treatment plants.
Progress Check (page-182), Chapter-19 Waste Generation and Management Selina Solutions
What is bagasse ?
Residue left after extracting the juice of sugarcane which is used as fuel or paper industry.
Pesticide and fertilizers.
1) Degradable part
2) Non Degradable part.
Progress Check (page-184), Selina Biology solutions Chapter-19 Waste Generation and Management
Non Degradable Category of waste.
Yes, Putting the waste organic matter for decay and used as fertilizers.
What is sluge?
Solid PPT produce after 2nd treatment when oxidised released carbon dioxide.
Yes, release harmful substances during incineration
A.Multiple Choice Type, Chapter 19 – Waste Generation and Management Selina Solutions
The most convenient reusable wastes are
(a) Old newspapers
(b) Broken glass
(d) Medical instruments
(a) Old newspapers
The most rapidly increasing and much harmful waste today is
(c) municipal sewage
(d) electronic waste
B. VERY SHORT ANSWER TYPE Revised Concise Selina Biology Solutions Chapter 19 – Waste Generation and Management
Name the following :
(a) The solid precipitated material produced during secondary treatment of the effluent carried out in the effluent treatment plants.
(b) The two types of devices commonly used for removing the particulate air pollutants.
(b) Scrubber, Plate type electrostatic precipitator
Mention whether the following statements are true (T) or False (F).
(a) Some of the electronic wastes may contain valuable metals such as copper. (T/F)
(b) Flyash is the gaseous waste of cement industry. (T/F)
(c) Electricity is one of the primary needs of human society. (T/F)
(c) False. Electricity is one of the secondary needs of human society.
Match the items in Column I with as many times as possible in Column II.
|Column I||Column II|
|1. Cow dung||(i) Sugarcane|
|2. Bagasse||(ii) Raddiwalas|
|3. Old newspapers||(iii) Manure|
|Column I||Column II|
|1. Cow dung||(iii) Manure
|2. Bagasse||(i) Sugarcane|
|3. Old newspapers||(ii) Raddiwalas
C. SHORT ANSWER TYPE Chapter 19 – Waste Generation and Management Selina Solutions
Differentiate between degradable and non-degradable type of waste.
|The waste that can be decomposed by micro-organisms is called degradable waste.||The waste that cannot be decomposed by micro-organisms is called non-degradable waste.|
|E.g. Vegetable peel, paper, cloth etc.||E.g. Plastic|
Give reasons for the following :
(a) Broken glass utensils are a kind of non-degradable waste.
(b) Landfills are coming up fast near large cities.
(c) Why is municipal sewage is first separated into degradable and non-degradable wastes.
Broken glass utensils are a kind of non-degradable waste as they cannot be decomposed and broken down by living micro-organisms. These need to be disposed off in deep dug out pits so that they do not cause any harm. However, sometimes broken glass in large quantities can be used in glass industries after melting them.
Landfills are coming up fast near large cities due to huge population growth and lack of using efficient and safe disposal method. As construction activities are very active, new colonies are being raised and construction units have become very active. These produce large quantities of waste stones, pebbles, broken bricks and wood waste. Mostly, these are used as landfills. One can see heaps of landfills in the suburbs.
Municipal sewage is first separated into degradable and non-degradable wastes because degradable wastes can be broken down into non-toxic waste in septic tanks, while non-degradable waste needs to be dumped or buried at safe places to avoid any hazardous effects.
D. LONG ANSWER TYPE – Waste Generation and Management Chapter-19 Selina ICSE Biology Solutions
Define electronic waste and list at least six items which come under this category.
Electronic waste is the waste generated by discarded electrical appliances.
Items which come under the category of electronic waste:
- Fluorescent tubes
- Medical instruments
- Lead acid batteries
- Mobile phones
List some of the common wastes produced in mining operation and mention how these can be reused.
Common wastes produced in mining operation:
Coal, Dust, Iron, Copper, Zinc, etc.
Reusing of wastes produced in mining operation:
During operation of getting minerals, a large quantity of waste material is produced. This waste material is called mine tailing. It is the left over. The mine tailing can be mixed with materials to produce tiles and masonry cement.
Describe the procedure how compost is usually produced.
The rotting and conversion of organic waste into manure is known as composting. The product formed after composting is called compost.
Method of preparing compost:
(i) A trench of about 5 m long, 1.5 m wide and 1.5 m deep is dug.
(ii) 30 cm thick layer of well-mixed refuse and waste is spread on it. This layer is completely wetted with a watery mixture of cow dung and some mud.
(iii) A second layer of mixed refuse is spread over the first layer, till the heap rises about half a metre.
(iv) The set-up is kept undisturbed for about 3 months, during which water is sprinkled over it at regular intervals.
(v) A trench is then dug, its material is taken out and rearranged in conical heaps and covered with a layer of soil.
(vi) After 50-60 days, compost is ready for use in cultivation fields or in garden flower beds, etc.
Describe the usefulness of incineration of wastes, and also mention the precautions required in it.
Usefulness of incineration of wastes:
It reduces the weight of the waste.
and reduces the volume of the waste.
also renders toxic wastes into less toxic or even non-toxic wastes.
Precautions required for incineration:
It should be carried out at very high temperatures.
and should be equipped with pollution control devices.
also should be installed away from residential areas.
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