Question 3 :
What are the factors that help in the formation of soil?
Question 4 :
What are the factors that decide which plants will thrive on a soil?
Question 5 :
Interactions between biotic and abiotic components consist of a transfer of matter and energy between the different components
of the biosphere. True or False?
Question 7 :
The process in which water evaporates and falls on the land as rain and later flows back into the sea via rivers is known as the _______.
Question 8 :
During lightning, the high temperatures and pressures created in the air convert nitrogen into oxides of nitrogen.TRUE OR FALSE?
Question 9 :
Plants generally take up nitrates and nitrites and convert them into amino acids which are used to make proteins.TRUE OR FALSE?
Question 10 :
Once the animal or the plant dies, other bacteria in the soil convert the various compounds of nitrogen back into nitrates and nitrites.TRUE OR FALSE?
Question 15 :
An increase in the carbon dioxide content in the atmosphere would cause more heat to be retained by the atmosphere and lead to global warming.TRUE OR FALSE?
Question 17 :
The endoskeletons and exoskeletons of various animals are formed from carbonate salts.TRUE OR FALSE?
Question 18 :
Carbon is incorporated into life-forms through the basic process of photosynthesis which is performed in the presence of Sunlight by all life-forms that contain chlorophyll.TRUE OR FALSE?
Question 19 :
Carbon occurs in the combined state as _______ in the atmosphere.
Question 24 :
The process of nitrogen-fixing by bacteria does not take place in the presence of oxygen.
TRUE OR FALSE?
Question 25 :
In combined form, oxygen occurs as ____ in the Earth's crust and also in the air.
Question 26 :
In the crust,oxygen is found as the oxides of most metals and silicon, and also as carbonate, sulphate, nitrate and other minerals.TRUE OR FALSE?
Question 27 :
Oxygen is found in the elemental form in the atmosphere to the extent of 21%. TRUE OR FALSE?
Question 30 :
CFCs (carbon compounds having both fluorine and chlorine which are very stable and not degraded by any biological process) were found to persist in the atmosphere and deplete the ozone layer.TRUE OR FALSE?
Question 32 :
Ozone absorbs harmful radiations from the Sun and prevents those harmful radiations from reaching the surface of the Earth where they may damage many forms of life.TRUE OR FALSE?
Question 35 :
The air that covers the whole of the Earth like a blanket, is called?
Question 36 :
The life-supporting zone of the Earth where the atmosphere, the hydrosphere and the lithosphere interact and make life possible, is known as?
Question 38 :
What among the following can be a major source of fresh water in a city/town/village ?
Question 43 :
We need not to conserve our natural resources and use them in a sustainable manner. True or False?
Question 44 :
_______ of water from water-bodies and subsequent condensation give us rain.
Question 45 :
State true or false. The greenhouse effect is a process that occurs when gases in Earth's atmosphere trap the Sun's heat.
Question 48 :
Which of the following are biologically important compounds that contain both oxygen and nitrogen?
Question 50 :
Why do not lichens occur in Delhi whereas they commonly grow in Manali or Darjeeling?