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Class 9 Exam  >  Class 9 Tests  >  Science Olympiad Class 9  >  Olympiad Test: Natural Resources- 4 - Class 9 MCQ

Olympiad Test: Natural Resources- 4 - Class 9 MCQ


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15 Questions MCQ Test Science Olympiad Class 9 - Olympiad Test: Natural Resources- 4

Olympiad Test: Natural Resources- 4 for Class 9 2024 is part of Science Olympiad Class 9 preparation. The Olympiad Test: Natural Resources- 4 questions and answers have been prepared according to the Class 9 exam syllabus.The Olympiad Test: Natural Resources- 4 MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Natural Resources- 4 below.
Solutions of Olympiad Test: Natural Resources- 4 questions in English are available as part of our Science Olympiad Class 9 for Class 9 & Olympiad Test: Natural Resources- 4 solutions in Hindi for Science Olympiad Class 9 course. Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free. Attempt Olympiad Test: Natural Resources- 4 | 15 questions in 30 minutes | Mock test for Class 9 preparation | Free important questions MCQ to study Science Olympiad Class 9 for Class 9 Exam | Download free PDF with solutions
Olympiad Test: Natural Resources- 4 - Question 1
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If there were no atmosphere around the earth, the temperature of the earth will

Detailed Solution for Olympiad Test: Natural Resources- 4 - Question 1
If there were no atmosphere around the earth, the temperature of the earth will increase during day and decrease during night. In the absence of atmosphere around the earth, it will be like a moon. There would be no life, no winds, no rains, no fires, no protection against harmful solar radiations. Due to absence of atmosphere around the moon, the temperature ranges from -190° C to 110° C. Air is a bad conductor of heat. The atmosphere has an average temperature of the earth almost steady during the day and night. It prevents sudden increase in temperature during the day time. Also, it decreases the rate of escape of heat during night time.

Thus, the correct answer is 'Increase during day and decrease during night.'

Olympiad Test: Natural Resources- 4 - Question 2
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‘Ozone - hole’ means

Detailed Solution for Olympiad Test: Natural Resources- 4 - Question 2
Ozone layer is a region of concentration of ozone molecule. O3 (O2 +O) in the earth's atmosphere. The layer lies in the stratosphere at an altitude of 18-50 kms. The ozone layer naturally Shields earth's life from the harmful effect of the Sun's ultraviolet radiations. A severe depletion of ozone (ozone hole) in a region of the ozone layer was found particularly over Antarctica. The depletion is caused by chlorofluorocarbons and by other compounds like CCI4,CF4 etc. So, the correct answer is 'Thinning of the ozone layer'.
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Olympiad Test: Natural Resources- 4 - Question 3
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One of the following factors does not lead to soil formation in nature

Detailed Solution for Olympiad Test: Natural Resources- 4 - Question 3
Polythene bags are not involved in soil formation. However, plastic bags are threat to environment, because these bags are non-degradable, i.e., do not decay and thus, do not lead to soil formation.
Olympiad Test: Natural Resources- 4 - Question 4
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One of the following processes is not a step involved in water-cycle operating in nature
Detailed Solution for Olympiad Test: Natural Resources- 4 - Question 4
Photosynthesis is the process in plants where sunlight, carbon dioxide and water are converted to organic compounds, starch, energy and oxygen. This is not involved in the water cycle and hence, it is the correct option.
Olympiad Test: Natural Resources- 4 - Question 5
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Low visibility during cold weather is due to
Detailed Solution for Olympiad Test: Natural Resources- 4 - Question 5
During winter, the water droplets condense in the air and lower visibility by forming fog. The dust particles also stick around the droplets thus lowering the visibility further. This phenomenon results in the formation of smog (smoke + fog) which lowers the visibility during cold weather seasons.
Olympiad Test: Natural Resources- 4 - Question 6
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An increase in carbon dioxide contents in the atmosphere would not cause:
Detailed Solution for Olympiad Test: Natural Resources- 4 - Question 6
Earth surface re-emits heat, obtained from the sun, in the form of infrared radiation but part of this does not escape into space as atmospheric gases (e.g., carbon dioxide, methane, etc.) absorb a major fraction of it. The molecules of these gases radiate heat energy, and a major part of which again comes to Earths surface, thus heating it up once again. This cycle is repeated many times.

The gases carbon dioxide, methane, chlorofluorocarbons and nitrous oxide are commonly known as greenhouse gases because they are responsible for the greenhouse effect. The greenhouse effect leads to global warming. Carbon dioxide is also one of the substrates used in the photosynthesis process. An increase in carbon dioxide concentration will increase the rate of photosynthesis. An increase in deserts is called desertification. Desertification will lead to the spread of desert plants. Several factors like a decrease in rainfall, atmospheric pollution, deforestation etc. are responsible for the spread of deserts but desertification is not directly linked to increasing carbon dioxide concentration.

Olympiad Test: Natural Resources- 4 - Question 7
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Which step is not involved in the carbon cycle?
Detailed Solution for Olympiad Test: Natural Resources- 4 - Question 7
Carbon-cycle is a process in which the carbon is circulated, transformed between living things and the environment. The burning of fossil fuels and respiration expels carbon dioxide in the environment which is fixed by the process of photosynthesis.

Transpiration is a process in which the moisture is carried from roots to the leaves and then evaporation occurs from the pores present on the underside of the leaves.

Olympiad Test: Natural Resources- 4 - Question 8
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Marked temperature changes in aquatic environment can affect.
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Marked temperature changes in aquatic environment can affect more breeding and the growth of aquatic plants, as the aquatic organisms and plants were highly dependent on the temperature factor.
Olympiad Test: Natural Resources- 4 - Question 9
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Ozone layer is getting depleted because of
Detailed Solution for Olympiad Test: Natural Resources- 4 - Question 9
Excessive use of man-made compounds containing both fluorine and chlorine. The ozone layer is getting depleted because of the excessive use of man-made compounds containing both fluorine and chlorine.
Olympiad Test: Natural Resources- 4 - Question 10
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Major source of mineral in soil is the
Detailed Solution for Olympiad Test: Natural Resources- 4 - Question 10
The soil minerals and organic matter can be replenished with help of decomposers. Hence, the correct answer is option D i.e., the major source of the minerals in the soil is parent rock from which soil is formed.
Olympiad Test: Natural Resources- 4 - Question 11
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Rain fall patterns depend on
Detailed Solution for Olympiad Test: Natural Resources- 4 - Question 11
Rainfall pattern will depend on number of water bodies in an area, as there will be large water bodies, (ocean, river) the rate of evaporation would be high, which will help to cause rain in the area.
Olympiad Test: Natural Resources- 4 - Question 12
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Oxygen is returned to the atmosphere mainly by
Detailed Solution for Olympiad Test: Natural Resources- 4 - Question 12
Photosynthesis is the process in which autotrophs such as green plants use carbon dioxide and water in presence of sunlight to synthesize nutrients such carbohydrates in the form of glucose and release oxygen. Hence oxygen is returned to the atmosphere by photosynthesis.
Olympiad Test: Natural Resources- 4 - Question 13
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Oxygen is harmful for
Detailed Solution for Olympiad Test: Natural Resources- 4 - Question 13
Oxygen degrades nitrogenases easily. Therefore, in the presence of oxygen, several bacteria avoid producing the enzyme.: Oxygen is this harmful for Nitrogen-fixing bacteria.
Olympiad Test: Natural Resources- 4 - Question 14
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Choose the correct sequence

in atmosphere → organic carbon in plants
Detailed Solution for Olympiad Test: Natural Resources- 4 - Question 14
Nutrient cycles circulate matter through the biosphere. The nutrients regularly alternate between living (biotic) and nonliving (abiotic) components. Hence the nutrient cycles are also called as biogeochemical cycles. The important nutrient cycles are water cycle, carbon cycle, nitrogen cycle, mineral cycle. In the carbon cycle, atmospheric carbon is fixed into organic compounds like carbohydrates by green plants during the process of photosynthesis. The organic compounds are consumed by heterotrophic organisms like animals.
Olympiad Test: Natural Resources- 4 - Question 15
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Growth of lichens on barren rocks is followed by the growth of
Detailed Solution for Olympiad Test: Natural Resources- 4 - Question 15
The process of community development over time, which involves species in one stage being replaced by other species, is called ecological succession. It is divided as primary succession and secondary succession. An area is initially colonized by certain early-successional species such as Lichens, they are often the first organism to colonize an area that will undergo primary succession. Once new soil has formed in an area it gives way over time to mild-successional species, such as mosses and grasses, which in turn give way much later to late-successional species.
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