Q4 of 19 Page 143

Find the odd one out:

i) bioalcohol, green diesel, brothers, petroleum


ii) cholera, typhoid, scabies, dysentery

i) Petroleum

Petroleum is the odd one out among the given options. This is because petroleum is a fossil fuel while bioalcohol, bioethers, green diesel are bio-fuels. Fossil fuels are non-renewable sources of energy while bio-fuels are developed by humans from vegetables/crops/seeds which can be cultivated as per our need.


ii) Scabies


Scabies is a water-washed disease while cholera, typhoid and dysentery are water-borne diseases. Water-washed diseases are infections caused due to poor personal hygiene which may result from lack of water availability while water-borne diseases are those diseases which are transmitted by drinking contaminated water.


More from this chapter

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2

The pie diagram represents a survey result of infectious diseases in a village during

2008 – 2009. Analyse it and answer the following:



i) Which diseases affect the majority of the population?


ii) How are these diseases transmitted?


iii) Mention any three measures that can control the other two diseases.

 3

Match the suitable renewable and non-renewable sources.

 5

A non-renewable resource is a natural resource if it is replaced by the natural process at a rate equal to or faster than its rate of consumption by humans.

Read this statement and say whether it is correct or incorrect. If it is incorrect, give the correct statement.

 6

Pick out the appliances that can conserve electric energy.

Florescent bulbs, copper choke, solar water heater, electric water heater, tungsten bulbs, electronic choke.