Please tell me some important questions from the chapter "Natural resources "
Answers
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Multiple Choice Questions
Major source of mineral in soil is the
(a) parent rock from which soil is formed
(b) plants
(c) animals
(d) bacteria
Total earth’s surface covered by water is
(a) 75%
(b) 60%
(c) 85%
(d) 50%
Biotic component of biosphere is not constituted by
(a) producers
(b) consumers
(c) decomposer
(d) air
An increase in carbon dioxide content in the atmosphere would not cause
(a) more heat to be retained by the environment
(b) increase in photosynthesis in plants
(c) global warming
(d) abundance of desert plants
Oxygen is returned to the atmosphere mainly by
(a) burning of fossil fuel
(b) respiration
(c) photosynthesis
(d) fungi
Low visibility during cold weather is due to
(a) formation of fossil fuel
(b) unburnt carbon particles or hydrocarbons suspended in air
(c) lack of adequate power supply
(d) none of these
Growth of Lichens on barren rocks is followed by the growth of
(a) moss
(b) ferns
(c) gymnosperms
(d) algae
Marked temperature changes in aquatic environment can affect
(a) breeding of animals
(b) more growth of aquatic plants
(c) process of digestion in animals
(d) availability of nutrients.
Soil erosion can be prevented by
(a) raising forests
(b) deforestation
(c) excessive use of fertilizer
(d) overgrazing by animals
What happens when rain falls on soil without vegetation cover?
(a) Rain water percolates in soil efficiently
(b) Rain water causes loss of surface soil
(c) Rain water leads to fertility of the soil
(d) Rain water does not cause any change in soil
Oxygen is harmful for
(a) ferns
(b) nitrogen fixing bacteria
(c) chara
(d) mango tree
Short Answer Type Questions
Rivers from land, add minerals to sea water. Discuss how?
How can we prevent the loss of top soil?
How is the life of organisms living in water affected when water gets polluted?
During summer, if you go near the lake, you feel relief from the heat, why?
In coastal area, wind current moves from the sea towards the land during day; but during night it moves from land to the sea. Discuss the reason.
Following are a few organisms
(a) lichen
(b) mosses
(c) mango tree
(d) cactus
Which among the above can grow on stones; and also help in formation of soil? Write the mode of their action for making soil.
Soil formation is done by both abiotic and biotic factors. List the names of these factors by classifying them as abiotic and biotic?
All the living organisms are basically made up of C, N, S, P, H and O. How do they enter the living forms? Discuss.
Why does the percentage of gases like oxygen, nitrogen and carbon dioxide remain almost the same in the atmosphere?
Why does moon have very cold and very hot temperature variations eg, from -190°C to 110°C even though it is at the same distance from the sun as the earth is?
Why do people love to fly kites near the seashore ?
Why does Mathura refinery pose problems to the Taj Mahal?
Why do not lichens occur in Delhi whereas they commonly grow in Manali or Darjeeling?
Why does water need conservation even though large oceans surround the land masses?
There is mass mortality of fishes in a pond. What may be the reasons ?
Lichens are called pioneer colonisers of bare rock. How can they help in formation of soil?
“Soil is formed by water.” If you agree to this statement then give reasons
Fertile soil has lots of humus. Why?
Why step farming is common in hills?
Why are root nodules useful for the plants?
Long Answer Type Questions
How do fossil fuels cause air pollution?
What are the causes of water pollution? Discuss how you can contribute in reducing water pollution.
A motor car, with its glass totally closed, is parked directly under the sun. The inside temperature of the car rises very high. Explain why?
Justify “Dust is a pollutant” ?
Explain the role of the Sun in the formation of soil.
Carbon dioxide is necessary for plants. Why do we consider it as a pollutant?