What are the uses of algae? Explain in detail.
Very small particles of solids and liquids suspended in air are called particulates.
58. Mention the effects of acid rain.
Oxygen cylinders contain oxygen in _______ state.
Fill in the blank:
Burning of wood and coal causes
Suggest any four activities in daily life which are eco-friendly
Why Oxygen is collected by water displacement?
To balance the collecting jar
Oxygen is less denser than water
Oxygen doesn't dissolve in water
All of the choices
Air is heavier than oxygen.
Greenhouse effect causes global warming.
What are the disadvantages of burning wood as fuel ?
Write True/False against the following statements.
(a) Oxygen in air is an exhaustible natural resource.
(b) Resources which are present in unlimited quantity in nature are called exhaustible natural resources.
(c) Wildlife is an exhaustible natural resource.
(d) Under high temperature and pressure, dead plants get slowly converted to coal.
(e) CNG is less polluting fuel than petrol and diesel.
Which of the following gas is released by refrigerators and air conditioners?
Carbon dioxide is a greenhouse gas.
Name the symptoms of heavy metal toxicity ?
What are the causes of air pollution? Name some air pollutants.
What are the adverse effects on humans due to lead poisoning?
(a) What is air? Write the names of various constituents of air.
(b) What is air pollution? What are the main sources of air pollution?
Identify the chemical formula of Ozone gas.
Name the gases which dissolve in rainwater before it reaches the ground. What harm can be caused by these gases?
By volume about __________ of air is nitrogen and about __________is oxygen.
________ is released by refrigerators and air conditioning systems into the atmosphere.
Gases responsible for green house effect are
All of the above
A hydrocarbon which is a greenhouse gas is:
Disposable plastic plates should not be used because
they are made of materials with lightweight
they are made of toxic materials
they are made of biodegradable materials
they are made of non-biodegradable materials
- carbon dioxide
- sulphur dioxide
- nitrous oxide
Fly ash in air reduces visibility.
In the following statements, the underlined words are jumbled up. Write them in their correct form.
(a) Air contains 78% ginroten and 21% gonexy.
(b) Vehicles produce high levels of pollutants like carbon dioxide, nitrogen oxides, nobrac moondexi, and mosek
(c) Carbon dioxide, thaneme, nitrous oxide, and water vapor are known as heengrouse sesga.
(d) Gangotri glacier in Himalaya has started melting because of lablog ringwam
(e) Whenever harmful substances such as wagese, toxic chemicals, silt, etc. get mixed with water, the water becomes potdulle.