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CBSE Questions for Class 9 Biology Natural Resources Quiz 1 - MCQExams.com
CBSE
Class 9 Biology
Natural Resources
Quiz 1
Depletion of ozone layer is noticed on
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America
0%
Asia
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Australia
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All over the earth
Explanation
Depletion of ozone layer is noticed all over the earth.
Ozone is destroyed by collisions with other atoms and molecules.
Humus is found in:
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Top portion of soil
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Middle portion of soil
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Deep portion of soil
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All layers of soil
Explanation
Humus is found at the top of the soil structures. It is dark coloured and spongy, which is rich in mineral and organic matter and shows maximum biological activity. It is formed by the decomposition of leaves and other plant material by soil microorganisms.
So, the correct option is A.
Why there is a need of man-made resources?
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Comfort
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Limited natural resources
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Increase in population
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All of the above
Explanation
All the natural resources are not unlimited in number. With the advancement of civilization man has become more social and increase in population raised the demand for the natural resources. So man-made resource has come as an alternative and gave more comforts to the humankind.
Ozone hole means
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Hole in the stratosphere
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Same concentration of ozone
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Decrease in the concentration of ozone
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Increase in the concentration of ozone
Explanation
Due to the depletion
of stratospheric ozone
, a seasonal hole
in the ozone
layer at polar regions is formed in the atmosphere. This is known as the ozone hole
.
The depletion of ozone
causes harmful UV rays to reach the earth. UV radiations are responsible for causing skin cancers and various diseases in humans.
So, the correct answer is option C.
Conversion of organic nitrogenous compounds into ammonium compound is called:
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Nitrification
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Ammonification
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Denitrification
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Denaturation
Explanation
Formation of ammonia from the organic nitrogenous compounds is called as ammonification. The dead remains of plants and animals contribute to the source of amonification. It is an important step in the nitrogen cycle. Nitrification is the process of conversion of ammonia into nitrate ions through nitrites.
So, the correct answer is option B.
The instrument which measures wind velocity is:
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Lactometer
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Anemometer
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Hydrometer
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Barometer
Which is not dangerous for life?
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Nuclear blast
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Deforestation
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Biopollutants
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Ozone layer
Explanation
A nuclear blast can cause the release of radiations which can cause cancer and the radioactive materials can lead to soil pollution.
Deforestation results in soil erosion and the quality of soil is degraded in which the plants cannot grow.
Biological pollution (impacts or bio pollution) is the impact of humanity's actions on the quality of the aquatic and terrestrial environment. Specifically, biological pollution is the introduction of non-indigenous and invasive species.
Ozone layer is present in the stratosphere over the Earths surface. This is a protective layer which prevents the entry of the harmful UV rays from the sun into the atmosphere.
Thus, the correct answer is option D.
Soil is a mixture of:
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Minerals
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Dead and living organisms
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Air and water
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All the above
Explanation
Soil is the uppermost humus containing part of the Earth's surface, which can sustain terrestrial plant life.
Soil is composed of inorganic mineral particles (45 percent), water (25 percent), air (25 percent), and humus (5 percent).
Humus is composed up of dead and decaying organic material.
Thus, the correct answer is option D.
Floods can be prevented by_______.
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afforestation
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cutting the forests
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tilling the land
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removing the top soil
Explanation
Afforestation involves the planting of trees in a drainage basin to increase interception and storage while reducing surface run off. This reduces a river's discharge and so makes it less likely to flood.
On the other hand, cutting forests, tilling land and removing top soil can not stop the run off and thus can not prevent floods.
The percentage of oxygen in air is:
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78%
0%
0.03%
0%
21%
0%
80%
Explanation
Air is a mixture of gases. It contains 78-79% nitrogen, 21 % oxygen, 0.93% argon, 0.03% carbon dioxide, and traces of hydrogen, helium, and other "noble" gases. So, the correct answer is option C.
Increase of temperature due to scattering of energy is by ozone, CO$$_2$$ and water vapour, is known as
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Radioactivity
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Ozone effect
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Solar reaction
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Greenhouse effect
Explanation
Global warming is the overheating of the earth due to the increased concentration of greenhouse gasses. Greenhouse gasses generally traps the radiations of the earth which leads to increase in the temperature of the earth and global warming. The greenhouse gasses includes water vapor, carbon dioxide, methane, nitrous oxide, and ozone.
___________ is a biotic component of the biosphere.
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Air
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Water
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Plants
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Soil
Explanation
All the living components form the biotic components of the biosphere. Biotic natural resources are the type of resources like plants, animals, insects, etc. which contain materials like carbon. All other sources like air, sunlight, and minerals are abiotic resources.
So, the correct answer is option C.
The Gangotri glacier in the Himalayas has started melting because of:
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Low temperature
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Very low temperature
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Global warming
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Acid rain
Explanation
The prime reason for the melting of the Gangotri glacier is global warming which is caused by the rapid increase in industrialization, the burning of fossil fuels and deforestation.
These human activities result in the emission of greenhouse gases such as carbon dioxide resulting in global warming.
Hence, the correct option is C.
The continuous movement of water on surface of the earth is described as
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Water movement
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Natural flow
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Water cycle
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All of the above
Explanation
The water cycle involves the continuous movement of water on, above and below the surface of the Earth.
The surface water evaporates by the process of evaporation which condenses into tiny droplets which fall on the earth as rain as a source of the atmospheric cycle.
Surface waters and atmospheric cycles thus overlap in hydrological cycles.
Thus, the correct answer is option C.
UV radiation increases the chances of ________ .
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skin cancer
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lung cancer
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both $$A$$ and $$B$$
0%
none of the above
Explanation
UV is radiation increases the chances of skin cancer, which is why ozone layer is very important as it shields the surface of earth from these UV radiations of the sun.
Option "A" is correct.
The atmosphere contains .......... % of oxygen.
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0%
21
0%
13
0%
75
0%
17
Explanation
The atmosphere contains 21% oxygen. The level is maintained by respiration and photosynthesis.
So, the correct answer is option A.
Primary fuel among the following is:
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Petrol
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Diesel
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Methanol
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Natural gas
Explanation
Primary fuel is the one which is obtained directly from nature and natural gas occurs naturally in nature.
Petrol, diesel and kerosene are obtained by fractional distillation of petroleum which is a naturally occurring resource.
Hence, the correct answer is option D.
_____ are the cause of depletion of the atmospheric ozone layer.
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Chlorofluorocarbons
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$$CO_2$$
0%
$$SO_2$$
0%
none of the above
Explanation
Chlorofluorocarbons are the cause of depletion of the atmospheric ozone layer.
Which is not a characteristic of a natural resources among the following?
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They exists without action of human kind
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They can be made by humans
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They can be modified and used
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Demand is very high
Explanation
Natural resources, as the name indicates are originated naturally. It exists with or without human being intervention. It can't be created by humans but can be modified and utilized accordingly for human comfort.
Also, some of the natural resources are limited in nature hence its demand is very high.
So, the correct option is B.
Which of the following is not a man-made resource ?
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Robot
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Minerals
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Buildings
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Clothes
Explanation
Minerals are natural resources. Remaining ones are man-made.
Minerals are ........... in origin.
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Biogenic
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Abiogenic
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Epidermal
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None of the above
Explanation
Minerals are obtained from earth's crust and the layers below it. Which then enter the biotic world through plants.
So, the correct answer is '
Abiogenic'
The circulation of oxygen in various forms through nature is called
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Respiration
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Circulation
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Oxygen cycle
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All of the above
Explanation
The oxygen cycle is the cycle that helps move oxygen through the three main regions of the Earth, the Atmosphere, the Biosphere, and the Lithosphere. The Atmosphere is of course the region of gases that lies above the Earth's surface and it is one of the largest reservoirs of free oxygen on earth.
The correct option is C.
In the water cycle, the process by which water is returned to the atmosphere in the form of water vapour, is known as:
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Runoff
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Condensation
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Evaporation
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Precipitation
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None of the above
All of these are biotic factors
except:
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Trees
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Mushrooms
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Squirrels
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Soil
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Bacteria
Explanation
The environment is a complex of many factors which surround an organism. These factors are known as environmental factors or ecological factors which may be either living or biotic and non-living or biotic.
Biotic factors include plants, animals, microbes, etc.
Abiotic factors are the non-living factors, substances, and conditions of the environment which influence the physiology, survival, function, and reproduction of organisms.
Hence, trees, mushrooms, squirrels, and bacteria are biotic factors while the soil is an abiotic factor.
So, the correct answer is 'Soil'.
Water evaporates into air from oceans, rivers and lakes but not from the soil.
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True
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False
Explanation
Soil also contains water, so evaporation also takes place from the soil.
Which of the following process in the water cycle takes place due to rapid cooling of air?
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Condensation
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Evaporation
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Precipitation
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None of the above
Explanation
Condensation is the change of water from its gaseous form (water vapor) into liquid water. Condensation generally occurs in the atmosphere when warm air rises, cools and looses its capacity to hold water vapor. As a result, excess water vapor condenses to form cloud droplets.
Water cycles through the biosphere in all of the following processes except:
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Precipitation
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Condensation
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Transpiration
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Decomposition
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Runoff
Explanation
A.
When the water vapour in the atmosphere condenses and falls in the form of rain, hail, snow, etc., it is called precipitation.
B.
Condensation is the conversion of a gas into liquid when the temperature is lowered down.
C. Transpiration is the loss of water in vapour form from the surface of leaves through minute pores called stomata.
D. Decomposition is the process of the breakdown of complex organic materials into simpler ones.
E.
Runoff is the overflow or the flow of excess water over the earth's surface from any water source.
Hence, w
ater cycles through the biosphere in all of the given processes except decomposition.
So, the correct answer is 'Decomposition'.
Which method helps to conserve soil fertility?
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Rotation of crops
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Crop minimizing
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Continuous cropping
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Use of pesticides in cropping
Explanation
Crop rotation is a pattern of growing different types of crops in the same area. This method helps in the replenishment of nutrients by the regular succession over the same field and enhances the health of crops. Hence, it minimizes the amount of pest and increases crop production. Thus, the correct answer is option D.
Oxygen is returned to the atmosphere in only one major process, that is, respiration.
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True
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False
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Ambigious
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Data insufficient
Explanation
Photosynthesis is a major process which is involved in returning oxygen to the atmosphere.
The given statement is False.
Which of the following is a community of plants and animals which occupies a large geographical area within a particular climate zone?
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Biodiversity
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Biome
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Habituate
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Niche
Explanation
A biome is a community of plants and animals that have common characteristics for the environment they exist in. They can be found over a range of continents. Biomes are distinct biological communities that have formed in response to a shared physical climate.
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