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Name three parameters that decide which type of plants will thrive on that soil.
What causes global warming?
What are the different states in which water can be found during the water cycle?
Name two biologically important compounds that contain both oxygen and nitrogen.
How is our atmosphere different from the atmosphere on Venus and Mars?
Give Reason for the following:
Why do organisms need water?
Why is the atmosphere essential for life?
Why is it said that nitrogen is very important for us?
Oxygen is considered vital for all living organisms. But it is considered dangerous also in few cases. Why is it so?
Why decomposers are considered as an important part of biogeochemical cycles?
Differentiate between afforestation and deforestation.
Differentiate between nitrification and de-nitrification.
Differentiate between renewable and non-renewable natural resources.
Differentiate between biodegradable and non-biodegradable resources.
How are clouds formed ?
What causes wind?
How is soil formed?
What is soil erosion? What are the methods of preventing or reducing soil erosion?
What are the two forms of oxygen found in the atmosphere ?
What is greenhouse effect?
How forests influence the quality of our air, soil and water resources? Explain.
What is the major source of freshwater in the city/town/village where you live? Do you know of any activity which may be polluting this water source?
List any three human activities that you think would lead to air pollution.
Name the various forms of carbon found on the Earth. How the carbon cycle may get disrupted?
Which of the following is not a greenhouse gas?
Which parts/belongings of animals are particularly susceptible to temperature changes?
Which of the following is the major factor in deciding soil structure?
The factor which decides the type of soil is
The large-scale deforestation that is happening all over the world is causing:
Which type of soil is more likely to be removed very quickly?
Name an important factor that decides biodiversity in a particular area:
Carbon containing molecules present in all life forms includes:
In nature, carbon is found in elemental forms as:
The endoskeletons and exoskeletons of various animals are also formed from :
The nitrogen molecules present in air can be converted into nitrates and nitrites by:
One of the following processes is not a step involved in the water cycle operating in nature:
The term “water pollution” can be defined in several ways. Which of the following statements does not give the correct definition?
Soil erosion can be prevented by:
What happens when rain falls on soil without vegetation cover?
Oxygen is harmful for:
The atmosphere of the earth is heated by radiations which are mainly:
If there were no atmosphere around the earth, the temperature of the earth will:
Major source of mineral in soil is the:
Total earth’s surface covered by water is:
Topsoil contains the following:
Choose the correct sequences:
The process of nitrogen-fixation by bacteria does not take place in the presence of :
Rainfall patterns depend on :
Among the given options, which one is not correct for the use of large amount of fertilizers and pesticides?
Growth of Lichens on barren rocks is followed by the growth of :
Marked temperature changes in aquatic environment can affect :
Biotic component of biosphere is not constituted by :
An increase in carbon dioxide content in the atmosphere would not cause :
What would happen, if all the oxygen present in the environment is converted to ozone?
One of the following factors does not lead to soil formation in nature:
The two forms of oxygen found in the atmosphere are:
Which step is not involved in the carbon cycle?
Ozone layer is getting depleted becauseof:
Oxygen is returned to the atmosphere mainly by:
Low visibility during cold weather is due to:
Which of the following is a recently originated problem of environment?
When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?
Smog is a combination of:
Write true or false for the following statements :
Oxygen is returned to the atmosphere in only one major process, that is, respiration.
The process of nitrogen-fixing is done by bacteria in the presence of oxygen.
Oxygen is necessary to life for most of the organisms in the process of respiration but some forms of life, especially bacteria, are poisoned by elemental oxygen.
Carbon dioxide is one of the greenhouse gases.
Another process that adds to the CO2 in the atmosphere is the process of photosynthesis where fuels are burnt to provide energy for various needs.
Plants generally take up nitrates and nitrites and convert them into amino acids which are used to make carbohydrates.
Nitrogen gas makes up 78% of our atmosphere and nitrogen is also a part of many molecules essential to life like proteins, nucleic acids (DNA and RNA) and some vitamins.
All the movements of air resulting in diverse atmospheric phenomena are caused by the uneven heating of the atmosphere in different regions of the earth.
The heating of the air causes the water vapour in the air to condense in the form of tiny droplets.
Nitrogen is also found in other biologically important compounds such as alkaloids and urea.