Selina solutions concise biology class 9 icse Solutions for Chapter 19 waste generation and management

Exercises in Chapter 19 waste generation and management Grade 9

Exercise

Questions in Exercise

How will you categorize the following under domestic and industrial wastes? Rags, used containers, old newspapers, mine tailing (leftovers), fly ash, kitchen waste, broken bricks

What is bagasse?

Name any two categories of chemicals which are washed off as wastes from agricultural fields.

What are the two portions into which the municipal sewage is separated?

in which category of wastes will you include the non-functioning discarded (i) Mobile phones, (ii) Thermometers, (iii) Photocopying machines.

Name the three categories of wastes under segregation

Which categories of wastes require dumping?

Is it true that composting is a useful method contributing to crop farming?

What is sludge?

Can incineration lead to a certain kind of pollution/ Yes/No

Name two types of devices used for removing particulate air pollutants.

The most convenient reusable wastes are (a) Old newspapers (b) Broken glass (c) Flash (d) Medical instruments

The most rapidly increasing and much harmful waste today is (a) Plastics (b) Pesticides (c) Municipal sewage (d) Electronic waste

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 particulate air pollutants.

Mention whether the following statements are true (T) or false (F). (a) Some of the electronic wastes may contain valuable metals such as gold and copper-T/F (b) Flyash is the gaseous waste of the cement industry T/F (c) Electricity is one of the primary needs of human society T/F

Match the items in Column I with as many items as possible in Column II. Column I Column II

Cow dung (i) Sugarcane
Bagasse (ii) Raddiwalas
Old newspapers (iii) Manure

Differentiate between the degradable and non-degradable type of waste

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?

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

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

Describe the procedure usually used to produce compost

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