Waste Generation and Management Long Answer Biology Class-9 ICSE Selina Publishers

Waste Generation and Management Long Answer Biology Class-9 ICSE Selina Publishers Solutions Chapter-19. Step By Step ICSE Selina Concise Solutions of Chapter-19 Waste Generation and Management with Exercise-19 including MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type and Structured/Application Questions SolvedVisit official Website CISCE for detail information about ICSE Board Class-9.

Waste Generation and Management Exe-19 Long Answer Biology Class-9 ICSE Concise Selina Publishers

Board ICSE
Publications Selina Publication
Subject Biology
Class 9th
Chapter-19 Waste Generation and Management
Book Name Concise
Topics Solution of D. Long Answer Type
Academic Session 2023-2024

D. Long Answer Type 

Waste Generation and Management Class-9 Biology Concise Solutions  

Page 199

Question 1.

Define electronic waste and list at least six items which come under this category.

Answer:

Electronic waste is the waste generated by discarded electrical appliances.

Items which come under the category of electronic waste:
  1. Fluorescent tubes
  2. Medical instruments
  3. Toys
  4. Lead acid batteries
  5. Mobile phones
  6. Radios

Question 2.

List some of the common wastes produced in mining operation and mention how these can be reused.

Answer:

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.

Question 3.

Describe the procedure how compost is usually produced.

Answer:

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.

Question 4.

Describe the usefulness of incineration of wastes, and also mention the precautions required in it.

Answer:

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.

—  : End of Waste Generation and Management D. Long Answer Class-9 ICSE Biology Solutions :–

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