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Natural Resources · MP Board (MPBSE) STD 9 (Madhya Pradesh - English Medium). 9 questions.

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Question 11 Mark
Atmosphere of Mars is rich in ____________.
Answer
Atmosphere of Mars is rich in Carbon dioxide.
Explanation:
Atmosphere of Mars is composed of $95.32 \% \mathrm{CO}_2, 2.7 \%$ Nitrogen, $1.6 \%$ Argon, $0.13 \%$ Oxygen and $0.8 \%$ carbon monoxide.
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Question 21 Mark
$CFCs$ are carbon compounds having both ___________ and chlorine.
Answer
$CFCs$ are carbon compounds having both Fluorine and chlorine.
Explanation: Chlorofluorocarbons are organic compounds that have carbon, fluorine and chlorine.
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Question 31 Mark
The conversion of atmosphere nitrogen into nitrates is called _____.
Answer
The conversion of atmosphere nitrogen into nitrates is called Nitrogen fixation.
Explanation:
The conversion of nitrogen gas $\left(\mathrm{N}_2\right)$ into nitrates and nitrites through atmospheric, industrial and biological processes is called nitrogen fixation.
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Question 41 Mark
Surface temperature of moon varies from $-190^\circ $ to __________.
Answer
Surface temperature of moon varies from $-190^\circ $ to $110^\circ $.
Explanation: It is $110$ degree at day and minus $170$ at night. Moon doesn’t have an atmosphere & water vapour to diminish sun at day and retain heat at night. So either moon has $100 \%$ solar energy or completely lacks it.
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Question 51 Mark
The process of photosynthesis and respiration causes the cycling of _____ through the environment.
Answer
The process of photosynthesis and respiration causes the cycling of Maintains the balance of oxygen and carbon dioxide through the environment. Explanation: The cycle of photosynthesis and respiration maintains the balance of oxygen and carbon dioxide. Photosynthesis produces the oxygen to replenish oxygen that is used up by living organisms during respiration. Carbon dioxide produced during respiration is one of the reactants plants need to perform photosynthesis.
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Question 61 Mark
__________ makes soil porous and allows water and air to peneterate deep underground.
Answer
Humus makes soil porous and allows water and air to peneterate deep underground.
Explanation: Humus is organic due to large content of organic carbon. It retains moisture in the soil and loosens the soil thus allowing water and air to penetrate deep underground thus increasing the soil organisms which provide nutrients to the plant.
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Question 71 Mark
Earthworms are __________ which are involved in paedogenesis.
Answer
Earthworms are Detritivores which are involved in paedogenesis.
Explanation: Paedogenesis is decomposition by bacteria and fungi during which organic material is broken leading to humification and mineraliation. Earthworm is a detritivore that consumes organic matter and add excretory nitrogen to soil.
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Question 81 Mark
The pollutant responsible for ozone hole is _____.
Answer
The pollutant responsible for ozone hole is Chlorofluorocarbons.
Explanation: The main cause of ozone depletion and the ozone hole is manufactured chemicals, especially manufactured halocarbon refrigerants, solvents, propellants and foam-blowing agents (chlorofluorocarbons $(CFCs)$ $HCFCs$, $halons$), referred to as ozone-depleting substances $(ODS)$.
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Question 91 Mark
Atmosphere of Earth is rich in ___________.
Answer
Atmosphere of Earth is rich in Nitrogen.
Explanation: Atmosphere of earth is $78 \%$ nitrogen, $21 \%$ oxygen, $0.9 \%$ argon and $0.3 \%$ carbon dioxide.
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