Conservation of Plants and Animals — Science STD 8 — Question

Explain, why does a brand new bicycle, have shining handlebar and wheel rims. What will happen if these are accidentally scratched?

In case of a fire, before the firemen use the water hoses to throw water to douse fire, they shut off the electricity supply for the area. Explain why this is done.

While driving what are the tips we must follow to save petrol/diesel/natural gas ?

Discuss the effects of deforestation on the following. Environment.

How can we prevent the following diseases? Typhoid.

For electroplating copper on an iron object, which terminal of the battery (positive or negative) is connected to the iron object? Also name the electrolyte you will use for this purpose.

Give examples to show that friction is both a friend and a foe.

Name any two common musical instruments and identify their vibrating parts.

Seeing a crowd of students in one corner of the school, the principal rushed to see the matter and found some children beating and chasing a small lizard. On seeing the principal, all children fled to their classes except Alok who requested the principal to arrange for some medical assistance for the Injured animal. The principal rewarded him for his attitude.
(i) Species of few animals are very less in number. What are these species known as ?
(ii) It is wrong to harm the animals. Give reason.
(iii) Give example of some endemic species of India.