{"id":31549,"date":"2026-05-22T10:39:58","date_gmt":"2026-05-22T05:09:58","guid":{"rendered":"https:\/\/mycbseguide.com\/blog\/?p=31549"},"modified":"2026-05-22T11:52:49","modified_gmt":"2026-05-22T06:22:49","slug":"earth-as-a-system-energy-matter-and-life-ncert-solutions-class-9-science-exploration","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/earth-as-a-system-energy-matter-and-life-ncert-solutions-class-9-science-exploration\/","title":{"rendered":"\u00a0Earth as a System: Energy Matter and Life &#8211; NCERT Solutions Class 9 Science Exploration"},"content":{"rendered":"\n<p>Earth as a System: Energy Matter and Life &#8211; NCERT Solutions Class 9 Science Exploration includes all the questions with solutions given in NCERT Class 9 <a href=\"https:\/\/ncert.nic.in\/textbook.php?iesc1=0-13\">Science Exploration<\/a> textbook.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">NCERT Solutions Class 9<\/h2>\n\n\n<a class=\"mks_button mks_button_small rounded\" href=\"https:\/\/mycbseguide.com\/blog\/category\/ncert-solutions\/ncert-solutions-class-9\/ncert-solutions-class-9-english-kaveri\/\" target=\"_self\" style=\"color: #FFFFFF; background-color: #0066bf;\" >English Kaveri<\/a>\n\n\n<a class=\"mks_button mks_button_small rounded\" href=\"https:\/\/mycbseguide.com\/blog\/category\/ncert-solutions\/ncert-solutions-class-9\/ncert-solutions-class-9-hindi-ganga\/\" target=\"_self\" style=\"color: #FFFFFF; background-color: #0066bf;\" >Hindi Ganga<\/a>\n\n\n<a class=\"mks_button mks_button_small rounded\" href=\"https:\/\/mycbseguide.com\/blog\/category\/ncert-solutions\/ncert-solutions-class-9\/ncert-solutions-class-9-sanskrit-sharada\/\" target=\"_self\" style=\"color: #FFFFFF; background-color: #0066bf;\" >Sanskrit Sharada<\/a>\n\n\n<a class=\"mks_button mks_button_small rounded\" href=\"https:\/\/mycbseguide.com\/blog\/category\/ncert-solutions\/ncert-solutions-class-9\/ncert-solutions-class-9-maths-ganita-manjari\/\" target=\"_self\" style=\"color: #FFFFFF; background-color: #0066bf;\" >Maths Ganita Manjari<\/a>\n\n\n<a class=\"mks_button mks_button_small rounded\" href=\"https:\/\/mycbseguide.com\/blog\/category\/ncert-solutions\/ncert-solutions-class-9\/ncert-solutions-class-9-science-exploration\/\" target=\"_self\" style=\"color: #FFFFFF; background-color: #0066bf;\" >Science Exploration<\/a>\n\n\n<a class=\"mks_button mks_button_small rounded\" href=\"https:\/\/mycbseguide.com\/blog\/category\/ncert-solutions\/ncert-solutions-class-9\/ncert-solutions-class-9-social-understanding-society\/\" target=\"_self\" style=\"color: #FFFFFF; background-color: #0066bf;\" >Social Understanding Society<\/a>\n\n\n\n<h2 class=\"wp-block-heading\">Earth as a System: Energy Matter and Life \u2013 NCERT Solutions<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.1: How does the warming of Arabian Sea water affect the southwest monsoon in India?<\/strong><\/p>\n\n\n\n<p>Solution: The warming of the Arabian Sea directly affects the Southwest Monsoon because monsoon winds are driven by temperature differences (uneven heating) between land and sea.<\/p>\n\n\n\n<p>When the Arabian Sea becomes warmer:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It increases evaporation, adding more moisture to the air.<\/li>\n\n\n\n<li>Moisture-laden winds blow towards the Indian subcontinent.<\/li>\n\n\n\n<li>This leads to heavier and sometimes more intense rainfall over regions like the west coast of India.<\/li>\n\n\n\n<li>However, excessive warming can also disturb normal wind patterns, making the monsoon irregular or unpredictable.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.2: If a large forest is cleared, how can that affect the flow of a river in that area?<\/strong><\/p>\n\n\n\n<p>Solution: Clearing a large forest (deforestation) can significantly affect the flow of a river in that area:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Reduced infiltration:<\/strong> Trees and plant roots help water seep into the ground. Without them, less water is absorbed, and more flows over the surface.<\/li>\n\n\n\n<li><strong>Increased runoff:<\/strong> Rainwater quickly flows into rivers, causing <strong>sudden floods<\/strong> during heavy rainfall.<\/li>\n\n\n\n<li><strong>Soil erosion:<\/strong> Without roots to hold soil, it gets washed into the river, leading to <strong>siltation<\/strong> (mud deposition), which can make the river shallow.<\/li>\n\n\n\n<li><strong>Irregular flow:<\/strong> Rivers may have <strong>too much water during rains (floods)<\/strong> and <strong>too little during dry periods (drought-like conditions)<\/strong>.<\/li>\n\n\n\n<li><strong>Reduced groundwater recharge:<\/strong> This decreases the base flow of rivers, especially in dry seasons.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.3: What might happen to coastal cities in India if glaciers and polar ice keep melting faster?<\/strong><\/p>\n\n\n\n<p>Solution: If glaciers and polar ice continue to melt faster, it will lead to a <strong>rise in sea level<\/strong>, which can seriously affect coastal cities in India.<\/p>\n\n\n\n<p>Possible impacts include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Flooding of coastal areas:<\/strong> Cities like Mumbai, Chennai, and Kolkata may experience frequent flooding, especially during high tides and storms.<\/li>\n\n\n\n<li><strong>Submergence of low-lying regions:<\/strong> Some areas may go permanently underwater.<\/li>\n\n\n\n<li><strong>Damage to infrastructure:<\/strong> Roads, buildings, and ports near the coast can be destroyed.<\/li>\n\n\n\n<li><strong>Saltwater intrusion:<\/strong> Seawater may enter freshwater sources, making drinking water scarce and harming agriculture.<\/li>\n\n\n\n<li><strong>Displacement of people:<\/strong> Many people living in coastal areas may be forced to migrate.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.4: How would increasing carbon dioxide levels in the atmosphere affect the ocean plankton?<\/strong><\/p>\n\n\n\n<p>Solution: Increasing levels of carbon dioxide (CO<sub>2<\/sub>) in the atmosphere affect ocean plankton mainly through <strong>ocean acidification<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CO<sub>2<\/sub> dissolves in seawater<\/strong>, forming carbonic acid, which lowers the pH of the ocean.<\/li>\n\n\n\n<li>This makes it harder for <strong>plankton like phytoplankton and zooplankton<\/strong> (especially those with calcium carbonate shells) to <strong>build and maintain their shells<\/strong>.<\/li>\n\n\n\n<li>As a result, many plankton species may <strong>decline in number<\/strong> or become weaker.<\/li>\n\n\n\n<li>Since plankton form the <strong>base of the marine food chain<\/strong>, their decline can affect fish and other marine organisms.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.5: How does the cool mountain breeze benefit agriculture activity, particularly the crops and soil?<\/strong><\/p>\n\n\n\n<p>Solution: Cool mountain breeze (air flowing from mountains toward valleys, especially at night) benefits agriculture in several ways:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Reduces heat stress on crops:<\/strong> Cooler air helps plants recover from daytime heat, improving growth and preventing damage.<\/li>\n\n\n\n<li><strong>Maintains soil moisture:<\/strong> Lower temperatures reduce evaporation, so the soil retains more water for longer periods.<\/li>\n\n\n\n<li><strong>Prevents crop drying and wilting:<\/strong> Crops stay fresh and hydrated due to the cooling effect.<\/li>\n\n\n\n<li><strong>Improves air circulation:<\/strong> Gentle winds help in gas exchange (CO<sub>2<\/sub> intake and oxygen release), supporting photosynthesis and respiration.<\/li>\n\n\n\n<li><strong>Reduces pest and disease spread (in some cases):<\/strong> Cooler and well-ventilated conditions can limit certain pests and fungal growth.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.6: The CO<sub>2<\/sub> dissolved in the ocean is disturbed when the global temperature increases. What will happen to marine life?<\/strong><\/p>\n\n\n\n<p>Solution: When global temperature increases, the balance of CO<sub>2<\/sub> dissolved in the oceans gets disturbed, which affects marine life in several ways:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Reduced CO<sub>2<\/sub> absorption:<\/strong> Warmer ocean water holds less carbon dioxide, so more CO<sub>2<\/sub> remains in the atmosphere, worsening climate change.<\/li>\n\n\n\n<li><strong>Ocean acidification changes:<\/strong> Fluctuations in dissolved CO<sub>2<\/sub> can still lead to <strong>acidic conditions<\/strong>, harming marine organisms.<\/li>\n\n\n\n<li><strong>Damage to shell-forming organisms:<\/strong> Creatures like plankton, corals, and shellfish find it difficult to <strong>build and maintain calcium carbonate shells<\/strong>.<\/li>\n\n\n\n<li><strong>Disruption of food chains:<\/strong> Since plankton are the base of the marine food web, their decline affects fish and larger marine animals.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.7: What would happen to plants and animals on Earth if the biogeochemical cycles were disrupted and stopped? Explain by giving a few examples.<\/strong><\/p>\n\n\n\n<p>Solution: Biogeochemical cycles (like the carbon, oxygen, nitrogen, and water cycles) are essential for maintaining life on Earth. If these cycles were disrupted or stopped, plants and animals would not survive.<\/p>\n\n\n\n<p><strong>What would happen?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Lack of essential nutrients:<\/strong><br>Plants need nutrients like nitrogen and carbon. Without cycles, these would not be recycled, so plants would <strong>stop growing and eventually die<\/strong>.<\/li>\n\n\n\n<li><strong>No oxygen\u2013carbon balance:<\/strong><br>If the carbon and oxygen cycles stop, oxygen would not be replenished and carbon dioxide would accumulate, making it <strong>impossible for animals to breathe<\/strong>.<\/li>\n\n\n\n<li><strong>Water shortage:<\/strong><br>If the water cycle stops, there would be <strong>no rainfall<\/strong>, leading to drought and death of plants and animals.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.8: What if photosynthesis stopped, what would happen on the Earth?<\/strong><\/p>\n\n\n\n<p>Solution: If <strong>photosynthesis stopped<\/strong>, the consequences for Earth would be catastrophic:<\/p>\n\n\n\n<p><strong>What would happen?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Food chains would collapse:<\/strong><br>Plants (producers) would no longer make food. Herbivores would starve first, followed by carnivores \u2192 <strong>entire food chains collapse<\/strong>.<\/li>\n\n\n\n<li><strong>Oxygen would decrease:<\/strong><br>Photosynthesis is the main source of oxygen. Without it, oxygen levels would <strong>gradually fall<\/strong>, making survival impossible for most organisms.<\/li>\n\n\n\n<li><strong>Carbon dioxide would increase:<\/strong><br>CO<sub>2<\/sub> would not be used by plants and would <strong>build up in the atmosphere<\/strong>, causing extreme warming.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.9: Discuss how human activities increase the concentration of greenhouse gases in the atmosphere. What would you do as an individual to reduce the emission of greenhouse gas?<\/strong><\/p>\n\n\n\n<p>Solution: Human actions add large amounts of gases like CO<sub>2<\/sub>, methane (CH<sub>4<\/sub>), and nitrous oxide (N<sub>2<\/sub>O) to the atmosphere:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Burning fossil fuels:<\/strong><br>Vehicles, industries, and power plants burn coal, petrol, and diesel, releasing large amounts of <strong>carbon dioxide (CO<sub>2<\/sub>)<\/strong>.<\/li>\n\n\n\n<li><strong>Deforestation:<\/strong><br>Cutting forests reduces the number of trees that absorb CO<sub>2<\/sub>, and burning trees releases stored carbon.<\/li>\n\n\n\n<li><strong>Agriculture and livestock:<\/strong><br>Cattle and rice fields produce <strong>methane (CH<sub>4<\/sub>)<\/strong>, a powerful greenhouse gas.<\/li>\n\n\n\n<li><strong>Industrial activities:<\/strong><br>Factories release gases like CO<sub>2<\/sub> and other pollutants during production processes.<\/li>\n\n\n\n<li><strong>Waste and landfills:<\/strong><br>Decomposing garbage releases methane into the atmosphere.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.10: How much solar energy will be received by a {tex}1 {m}^2{\/tex} area in one hour, if the insolation on the surface of the Earth were {tex}1 {kWm}^{-2}{\/tex}?<\/strong><\/p>\n\n\n\n<p>Solution:<\/p>\n\n\n\n<p>{tex}{E}=\\text { Intensity } \\times \\text { area \u00d7 time }{\/tex}<br>{tex}{E}=1 \\times 1000 {~J} {~s}^{-1} {~m}^{-2} \\times 1 {~m}^2 \\times 3600 {~s}{\/tex}<br>{tex}{E}=3600000 {~J}=3.6 \\times 10^6 {~J}{\/tex}<\/p>\n\n\n\n<p>(This amount of energy is approximately equal to the energy needed to melt 5 kg of ice and heat the water obtained to 100 \u00b0C. It is also equal to one unit of electricity used in a household, as shown on an electricity bill).<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.11: What happens to the warm surface of water from the equator as it travels toward the poles? What impact does this movement have on the area?<\/strong><\/p>\n\n\n\n<p>Solution: What happens to the warm water?<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Warm surface water from the equator moves toward the poles through ocean currents.<\/li>\n\n\n\n<li>As it reaches higher latitudes, it <strong>loses heat and becomes cooler<\/strong>.<\/li>\n\n\n\n<li>The cooled water becomes <strong>denser and sinks<\/strong> into deeper ocean layers.<\/li>\n<\/ul>\n\n\n\n<p>What impact does this movement have?<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Warms nearby coastal regions:<\/strong> Places near warm currents experience a <strong>milder climate<\/strong> than expected.<\/li>\n\n\n\n<li><strong>Regulates global temperature:<\/strong> Heat is redistributed from the equator to colder regions.<\/li>\n\n\n\n<li><strong>Affects weather patterns:<\/strong> It influences winds, rainfall, and storms.<\/li>\n\n\n\n<li><strong>Supports marine ecosystems:<\/strong> The movement helps circulate nutrients, benefiting marine life.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.12: Choose the most appropriate option to describe the role of biogeochemical cycles in an ecosystem.<\/strong><\/p>\n\n\n\n<p>Options:<br>(1) To provide food directly to all organisms.<br>(2) To recycle essential nutrients between biotic and abiotic&nbsp;components. \u2705<br>(3) To create new elements for use by living things.<br>(4) To remove pollutants and toxins from the organism.<\/p>\n\n\n\n<p>Explanation: Biogeochemical cycles (like the carbon, nitrogen, and water cycles) are responsible for <strong>circulating nutrients<\/strong> between living organisms (biotic components) and the environment (abiotic components such as air, water, and soil).<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.13: Which of the following is primarily responsible for warming of the Earth?<\/strong><\/p>\n\n\n\n<p>Options:<br>(1) Solar radiation is immediately absorbed by carbon dioxide, which then releases it as heat.<br>(2) The atmosphere\u2019s tiny particles absorb incoming solar radiation, which directly heats the Earth.<br>(3) The Earth\u2019s surface absorbs solar radiation, which is then re-radiated and trapped by greenhouse gases. \u2705<br>(4) The Earth\u2019s environment is heated only by the solar radiation reflected by the clouds.<\/p>\n\n\n\n<p>Explanation:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sunlight reaches Earth and is absorbed by land and oceans.<\/li>\n\n\n\n<li>The Earth then re-emits this energy as heat (infrared radiation).<\/li>\n\n\n\n<li>Greenhouse gases (like CO<sub>2<\/sub>, methane) trap this heat, leading to warming.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.14: Explain how climate change affects the water cycle. Illustrate with examples<\/strong>.<\/p>\n\n\n\n<p>Solution: Climate change strongly alters the <strong>water cycle<\/strong> by affecting evaporation, rainfall, and water distribution.<\/p>\n\n\n\n<p>How it affects the water cycle:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Increased evaporation:<\/strong><br>Rising temperatures cause more water to evaporate from oceans, rivers, and soil.<\/li>\n\n\n\n<li><strong>Changes in rainfall patterns:<\/strong><br>Some areas receive <strong>heavy rainfall and floods<\/strong>, while others face <strong>droughts<\/strong>.<\/li>\n\n\n\n<li><strong>Melting of glaciers:<\/strong><br>Glaciers melt faster, increasing river flow initially but reducing long-term water availability.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.15: Describe how albedo affects the Earth\u2019s surface temperature and its climate.<\/strong><\/p>\n\n\n\n<p>Solution: <strong>Albedo<\/strong> is the measure of how much sunlight a surface reflects.<\/p>\n\n\n\n<p>How albedo affects temperature:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>High albedo (more reflection):<\/strong><br>Surfaces like ice, snow, and clouds reflect most sunlight back into space \u2192 <strong>less heat is absorbed \u2192 cooler temperatures<\/strong>.<\/li>\n\n\n\n<li><strong>Low albedo (more absorption):<\/strong><br>Surfaces like oceans, forests, and dark soil absorb more sunlight \u2192 <strong>more heat is retained \u2192 warmer temperatures<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>Impact on climate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Polar regions stay cold:<\/strong><br>Ice and snow have high albedo, helping maintain low temperatures.<\/li>\n\n\n\n<li><strong>Global warming feedback:<\/strong><br>When ice melts, it exposes darker surfaces (like ocean water), which absorb more heat \u2192 <strong>further warming<\/strong> (positive feedback loop).<\/li>\n\n\n\n<li><strong>Regional climate differences:<\/strong><br>Areas with low albedo (like deserts or cities) tend to be hotter compared to areas with high albedo.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.16: How are mountain and valley breezes formed? Suppose there are two mountains, one covered with grass and another covered with barren rocks; would the temperature of the two mountain breezes be different? If so, how?<\/strong><\/p>\n\n\n\n<p>Solution: Mountain and valley breezes are formed due to uneven heating of mountain slopes.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>During the day, slopes heat up faster, warm air rises, and cool air from the valley moves upward \u2192 valley breeze.<\/li>\n\n\n\n<li>At night, slopes cool quickly, cold dense air flows down into the valley \u2192 mountain breeze.<\/li>\n<\/ul>\n\n\n\n<p>Yes, the temperature differs:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A rocky mountain heats and cools faster, producing warmer daytime breezes and colder nighttime breezes.<\/li>\n\n\n\n<li>A grass-covered mountain has milder and cooler breezes due to slower heating and cooling.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.17: You have witnessed weather phenomena, such as winds, storms, rainfall, etc. Which atmospheric layer is mainly responsible for such phenomena and what is the primary reason for its occurrence?<\/strong><\/p>\n\n\n\n<p>Solution: The Troposphere is mainly responsible for weather phenomena like winds, storms, and rainfall.<\/p>\n\n\n\n<p>This is because:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It contains most of the air and water vapour, which are essential for weather changes.<\/li>\n\n\n\n<li>It is heated unevenly by the Earth\u2019s surface, causing air movement and formation of winds, clouds, and rain.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.18: Explain the processes involved in the nitrogen cycle. How would life on Earth be affected if nitrogen were not cycled?<\/strong><\/p>\n\n\n\n<p>Solution: The nitrogen cycle involves:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Nitrogen fixation:<\/strong> Conversion of atmospheric nitrogen into usable forms by bacteria.<\/li>\n\n\n\n<li><strong>Nitrification and assimilation:<\/strong> Formation of nitrates and their absorption by plants; animals obtain nitrogen by eating plants.<\/li>\n\n\n\n<li><strong>Denitrification:<\/strong> Conversion of nitrates back to nitrogen gas.<\/li>\n<\/ul>\n\n\n\n<p>If nitrogen were not cycled:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Soil would become <strong>infertile<\/strong>, plants could not grow.<\/li>\n\n\n\n<li><strong>Proteins and DNA<\/strong> could not be formed, so life processes would stop.<br>Hence, life on Earth would not survive.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.19: What are the impacts of deforestation on the Earth\u2019s oxygen and carbon cycles? What are the other consequences of deforestation?<\/strong><\/p>\n\n\n\n<p>Solution: Impact on oxygen and carbon cycles:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reduced photosynthesis: Fewer trees \u2192 less CO<sub>2<\/sub> absorbed and less oxygen released.<\/li>\n\n\n\n<li>Increase in CO<sub>2<\/sub> levels: Cutting and burning trees releases stored carbon \u2192 enhances global warming.<\/li>\n<\/ul>\n\n\n\n<p>Other consequences:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Soil erosion and loss of fertility<\/li>\n\n\n\n<li>Loss of biodiversity (plants and animals lose habitat)<\/li>\n\n\n\n<li>Disturbed water cycle leading to floods and droughts<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.20: Explain with suitable diagram the path that carbon takes to go back to the atmosphere. You may start from plants using CO<sub>2<\/sub> from the atmosphere.<\/strong><\/p>\n\n\n\n<p>Solution: <strong>Photosynthesis:<\/strong> Plants take in CO<sub>2<\/sub>&nbsp;from the atmosphere and convert it into food.<\/p>\n\n\n\n<p><strong>Transfer through food chain:<\/strong> Animals eat plants, so carbon moves into animals.<\/p>\n\n\n\n<p><strong>Return to atmosphere:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Respiration<\/strong> by plants and animals releases CO<sub>2<\/sub>&nbsp;back into the air.<\/li>\n\n\n\n<li><strong>Decomposition<\/strong> of dead organisms releases CO<sub>2<\/sub>.<\/li>\n\n\n\n<li><strong>Burning of fuels\/wood<\/strong> also releases CO<sub>2<\/sub>.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/question_images\/1777268908-rdafqz.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.21: Why is an excess of CO<sub>2<\/sub> in the atmosphere considered undesirable even though it is required by plants?<\/strong><\/p>\n\n\n\n<p>Solution:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Although CO<sub>2<\/sub>&nbsp;is needed for photosynthesis, <strong>excess CO<sub>2<\/sub>&nbsp;enhances the greenhouse effect<\/strong>, trapping more heat in the atmosphere.<\/li>\n\n\n\n<li>This leads to <strong>global warming and climate change<\/strong>, causing melting of glaciers, rising sea levels, and extreme weather.<\/li>\n\n\n\n<li>It also disturbs the <strong>balance of gases<\/strong> in the atmosphere and can harm ecosystems.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.22: How is heat lost from the surface of the Earth? What is its significance?<\/strong><\/p>\n\n\n\n<p>Solution: How heat is lost:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The Earth\u2019s surface loses heat mainly by <strong>radiation<\/strong> in the form of infrared waves to the atmosphere.<\/li>\n\n\n\n<li>Some heat is also transferred by <strong>conduction and convection<\/strong> to the surrounding air.<\/li>\n<\/ul>\n\n\n\n<p>Significance:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Helps maintain the <strong>Earth\u2019s temperature balance<\/strong>.<\/li>\n\n\n\n<li>Drives <strong>winds and weather patterns<\/strong> due to uneven heating.<\/li>\n\n\n\n<li>Prevents excessive heating of the Earth\u2019s surface.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.23: If the Earth were a flat disc instead of a sphere, how would the patterns of solar radiation and temperature be different?<\/strong><\/p>\n\n\n\n<p>Solution: If the Earth were a flat disc:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Uniform solar radiation:<\/strong> Sunlight would fall more evenly on most areas instead of being spread over a curved surface \u2192 <strong>less variation in heating<\/strong>.<\/li>\n\n\n\n<li><strong>No clear climatic zones:<\/strong> There would be little or no distinction between equatorial, temperate, and polar regions.<\/li>\n\n\n\n<li><strong>Reduced temperature differences:<\/strong> Without curvature, differences in angle of sunlight would be minimal \u2192 <strong>weaker winds and ocean currents<\/strong>.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.24: Suppose there is a rise in atmospheric temperature on Earth. How would this affect the cryosphere, hydrosphere and biosphere?<\/strong><\/p>\n\n\n\n<p>Solution:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cryosphere (ice regions):<\/strong><br>Rising temperature causes melting of glaciers and polar ice, leading to loss of ice cover.<\/li>\n\n\n\n<li><strong>Hydrosphere (water bodies):<\/strong><br>Melting ice increases sea levels and causes changes in ocean currents and rainfall patterns.<\/li>\n\n\n\n<li><strong>Biosphere (living organisms):<\/strong><br>Plants and animals face habitat loss, migration, or extinction, and ecosystems get disturbed.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.25: Explain how the Earth\u2019s atmosphere helps in maintaining a suitable temperature for life to survive on the Earth.<\/strong><\/p>\n\n\n\n<p>Solution:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The atmosphere allows sunlight to reach the Earth and warms its surface.<\/li>\n\n\n\n<li>It traps some of the outgoing heat by greenhouse gases (like CO<sub>2<\/sub>&nbsp;and water vapour), preventing excessive cooling.<\/li>\n\n\n\n<li>It also distributes heat through winds and air circulation, reducing extreme temperature differences.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Q.26: Describe the interrelationship between different spheres of the Earth. Illustrate with example how these spheres function in a delicate balance.<\/strong><\/p>\n\n\n\n<p>Solution: The Earth has four main spheres- lithosphere (land), hydrosphere (water), atmosphere (air), and biosphere (living organisms)- which are closely interconnected.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>These spheres exchange matter and energy continuously (like water, gases, and nutrients).<\/li>\n\n\n\n<li>A change in one sphere affects the others, maintaining a delicate balance.<\/li>\n<\/ul>\n\n\n\n<p><strong>Example:<\/strong><br>Plants (biosphere) take CO<sub>2<\/sub>&nbsp;from the atmosphere and water from the hydrosphere to make food, and release oxygen back into the atmosphere. Soil (lithosphere) provides nutrients.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Class 9 Science Exploration NCERT Solutions<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/exploration-entering-the-world-of-secondary-science-ncert-solutions-class-9-science-exploration\/\">Exploration: Entering the World of Secondary Science<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/cell-the-building-block-of-life-ncert-solutions-class-9-science-exploration\/\">Cell: The Building Block of Life<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/tissues-in-action-ncert-solutions-class-9-science-exploration\/\">Tissues in Action<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/describing-motion-around-us-ncert-solutions-class-9-science-exlporation\/\">Describing Motion Around Us<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/exploring-mixtures-and-their-separation-ncert-solutions-class-9-science-exploration\/\">Exploring Mixtures and Their Separation<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/how-forces-affect-motion-ncert-solutions-class-9-science-exploration\/\">How Forces Affect Motion<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/work-energy-and-simple-machines-ncert-solutions-class-9-science-exploration\/\">Work, Energy and Simple Machines<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/journey-inside-the-atom-ncert-solutions-class-9-science-exploration\/\">Journey Inside the Atom<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/atomic-foundations-of-matter-ncert-solutions-class-9-science-exploration\/\">Atomic Foundations of Matter<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/sound-waves-ncert-solutions-class-9-science-exploration\/\">Sound Waves: Characteristics and Applications<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/reproduction-how-life-continues-ncert-solutions-class-9-science-exploration\/\">Reproduction: How Life Continues<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/patterns-in-life-diversity-and-classification-ncert-solutions-class-9-science-exploration\/\">Patterns in Life: Diversity and Classification<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/earth-as-a-system-energy-matter-and-life-ncert-solutions-class-9-science-exploration\/\">Earth as a System: Energy, Matter and Life<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Earth as a System: Energy Matter and Life &#8211; NCERT Solutions Class 9 Science Exploration includes all the questions with solutions given in NCERT Class 9 Science Exploration textbook. NCERT Solutions Class 9 Earth as a System: Energy Matter and Life \u2013 NCERT Solutions Q.1: How does the warming of Arabian Sea water affect the &#8230; <a title=\"\u00a0Earth as a System: Energy Matter and Life &#8211; NCERT Solutions Class 9 Science Exploration\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/earth-as-a-system-energy-matter-and-life-ncert-solutions-class-9-science-exploration\/\" aria-label=\"More on \u00a0Earth as a System: Energy Matter and Life &#8211; NCERT Solutions Class 9 Science Exploration\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[281,2071,2072],"tags":[216],"class_list":["post-31549","post","type-post","status-publish","format-standard","hentry","category-ncert-solutions","category-ncert-solutions-class-9","category-ncert-solutions-class-9-science-exploration","tag-ncert-solutions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u00a0Earth as a System: Energy Matter and Life - NCERT Solutions Class 9 Science Exploration | myCBSEguide<\/title>\n<meta name=\"description\" content=\"Earth as a System: Energy Matter and Life - NCERT Solutions Class 9 Science Exploration includes all the questions with solutions\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mycbseguide.com\/blog\/earth-as-a-system-energy-matter-and-life-ncert-solutions-class-9-science-exploration\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00a0Earth as a System: Energy Matter and Life - NCERT Solutions Class 9 Science Exploration | myCBSEguide\" \/>\n<meta property=\"og:description\" content=\"Earth as a System: Energy Matter and Life - NCERT Solutions Class 9 Science Exploration includes all the questions with solutions\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mycbseguide.com\/blog\/earth-as-a-system-energy-matter-and-life-ncert-solutions-class-9-science-exploration\/\" \/>\n<meta property=\"og:site_name\" content=\"myCBSEguide\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/mycbseguide\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-22T05:09:58+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-22T06:22:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/question_images\/1777268908-rdafqz.jpg\" \/>\n<meta name=\"author\" content=\"myCBSEguide\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@mycbseguide\" \/>\n<meta name=\"twitter:site\" content=\"@mycbseguide\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"myCBSEguide\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"13 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/mycbseguide.com\/blog\/earth-as-a-system-energy-matter-and-life-ncert-solutions-class-9-science-exploration\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/mycbseguide.com\/blog\/earth-as-a-system-energy-matter-and-life-ncert-solutions-class-9-science-exploration\/\"},\"author\":{\"name\":\"myCBSEguide\",\"@id\":\"https:\/\/mycbseguide.com\/blog\/#\/schema\/person\/10b8c7820ff29025ab8524da7c025f65\"},\"headline\":\"\u00a0Earth as a System: Energy Matter and Life &#8211; 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