Question 2:

_________ helps to create energy for plants and animals. Body cells take up ________ from blood and generate energy from food.

Question 3:

The combustion of _______ like coal, petroleum etc is a major cause of air pollution.

Question 4:

______ leads to blocking of sunlight from entering water bodies and reduces oxygen values in water, which creates an inhabitable environment.

Question 5:

The air that we breathe is present in the first zone of earth known as _______. It is 10 to 12 km from the surface of the earth.

Question 6:

__________ and agricultural activities are responsible for emission of greenhouse gases into the air. Trees clean the air by storing carbon dioxide, but due to heavy deforestation air pollution is on the rise.

Question 7:

The zone above troposphere is called the ________. It is rich in ozone gas, which forms the ozone layer. 

Question 8:

________  are also crucial for economic development of a country as they contribute to urbanisation, industrialisation, transportation and communication systems, and it becomes important that ______ are sustainably used.

Question 9:

Water exists in three forms: solid, liquid, and ________.

Question 10:

Minerals such as _______ and ______ are important sources of energy. They are widely used in different sectors such as transport, agriculture and industry.