Maharashtra Board Class 6 Geography Chapter 6 Importance of Oceans Solutions

Importance Of Oceans Class 6 Questions And Answers

A. Find The Odd Man Out:

Question 1. Shell, fish, crab, ship
Answer: ship
In simple words: Among the given options, 'ship' is a man-made vessel for transport, while shell, fish, and crab are marine organisms.

🎯 Exam Tip: Questions asking to find the odd one out test your ability to classify and differentiate items based on their core characteristics or categories.

 

Question 2. Arabian Sea, Mediterranean Sea, Dead Sea, Caspian Sea
Answer: Dead Sea
In simple words: The Dead Sea is a salt lake, not an actual sea connected to oceans, unlike the Arabian Sea, Mediterranean Sea, and Caspian Sea.

🎯 Exam Tip: Knowing the geographical classifications of various water bodies helps in accurately identifying anomalies.

 

Question 3. Sri Lanka, India, Norway, Peru
Answer: Sri Lanka
In simple words: Sri Lanka is an island nation, whereas India, Norway, and Peru are countries with continental landmasses.

🎯 Exam Tip: Identifying the unique geographical characteristics (e.g., island nation vs. continental nation) is key to solving such questions.

 

Question 4. Southern Ocean, Indian Ocean, Pacific Ocean, Bay of Bengal
Answer: Bay of Bengal
In simple words: The Bay of Bengal is a bay, a part of the Indian Ocean, while the others are major oceans themselves.

🎯 Exam Tip: Distinguishing between large ocean bodies and smaller regional seas/bays is crucial for geographical accuracy.

 

Question 5. Natural gas, salt, gold, manganese
Answer: Natural gas
In simple words: Natural gas is a fossil fuel, whereas salt, gold, and manganese are minerals, though some are found in or extracted from oceans.

🎯 Exam Tip: Understanding the classification of natural resources (e.g., fuels vs. minerals) helps in correctly identifying the distinct item.

 

B. Write The Answers:

Question 1. Which items does man get from the oceans?
Answer: Salt, fish, shells and other products, minerals like iron, lead, cobalt, sodium, manganese, chromium, zinc, mineral oil and natural gas are the items man gets from oceans.
In simple words: Oceans provide humans with essential resources such as salt, seafood, various minerals like iron and manganese, and energy sources like mineral oil and natural gas.

🎯 Exam Tip: When listing items, try to categorize them (e.g., food, minerals, energy) to ensure a comprehensive answer and avoid omissions.

 

Question 2. Why It is economic to carry out transport by water ways.
Answer:
• Waterways is a cost-effective, fuel efficient and relatively more environment- friendly means of transportation.
• Large scale transport of goods can be carried out with the help of ships, trawlers, boats, etc. at a low cost.
• So it is economic to carry out transport by waterway.
In simple words: Water transport is economic because it allows for the large-scale, fuel-efficient, and low-cost movement of goods via ships and boats, making it environmentally friendlier than other modes.

🎯 Exam Tip: Focus on keywords like "cost-effective," "fuel efficient," and "large scale" when explaining the economic advantages of waterways.

 

Question 3. Why There is a difference in the climate of regions close to the oceans and regions far away from the oceans.
Answer:
(i) The oceans influence the climatic condition of a place. Coastal areas are cooler and wetter than regions away from the ocean.
(ii) There is a difference in the maximum and minimum temperature with the difference being less in coastal region (nearness to the sea) while it is more in the region far away from the sea (continentality).
(iii) The temperature in coastal areas remains equable due to the mixing of vapour released through evaporation of water from these water bodies into air. This vapour absorbs and stores the heat released from the land.
In simple words: Oceans moderate temperatures in coastal areas, making them cooler and wetter with less temperature variation, whereas inland regions experience greater temperature extremes due to a lack of oceanic influence. This is because water vapor from the oceans absorbs and stores heat, creating an equable climate.

🎯 Exam Tip: Remember the concept of 'continentality' and the heat-regulating capacity of large water bodies when explaining climatic differences between coastal and inland areas.

 

Question 4. Which continents are located along the coast of the Pacific Ocean?
Answer: Asia, Australia, North America and South America are the continents located along the coast of the Pacific Ocean.
In simple words: The Pacific Ocean borders the continents of Asia, Australia, North America, and South America.

🎯 Exam Tip: Visualizing a world map can help recall which continents share a coastline with specific oceans.

 

Activity:

Colour the different oceans on an outline map of the world and prepare an index for the map. (See inside front cover, figure B.)

 

Project:

Group work: Make five groups. Each group should collect some information and pictures of one ocean. With the help of the information collected, each group should make a poster and make presentation.

 

Class 6 Geography Chapter 6 Importance Of Oceans Intext Questions And Answers

Think A Little!

Question 1. Where does the water flowing through the rivers go in the end?
Answer: The water flowing through the rivers goes into the oceans in the end.
In simple words: All rivers eventually flow into the oceans, completing a crucial part of the water cycle.

🎯 Exam Tip: This question relates to the global water cycle; linking rivers to oceans is a fundamental geographical concept.

 

Question 2. Are there volcanic eruptions in the seas?
Answer: Yes, volcanic eruptions take place in the seas.
In simple words: Volcanic eruptions occur beneath the sea, often forming mid-ocean ridges and islands.

🎯 Exam Tip: Remember that geological activities like volcanic eruptions are not limited to land but also occur extensively on the ocean floor.

 

Question 3. What would have happened if man had not discovered sea routes?
Answer:
• If there were no sea routes, we would lose out on the most economic option of transportation.
• Large scale transport of goods would become inconvenient.
• International trade too would suffer.
In simple words: Without sea routes, global transportation would be less economic and efficient, making large-scale goods movement inconvenient and severely impacting international trade.

🎯 Exam Tip: Focus on the economic and logistical implications when discussing the importance of sea routes for trade and transport.

 

Use Your Brain Power!

Question 1. Where did all this water on the earth come from?
Answer: While some scientists believe that water was created due to the impact of comets there are others who believe that Earth's waters have existed since the birth of planet earth.
In simple words: Scientists propose two main theories for Earth's water origin: either from comet impacts or as an inherent component present since the planet's formation.

🎯 Exam Tip: When discussing scientific theories, acknowledging multiple perspectives shows a broader understanding of the topic.

 

Find Out:

Question 1. Collect information about how a natural pearl is formed.
Answer:
• Natural pearls form when an irritant- usually a parasite and not the proverbial grain of sand - works its way into an oyster, mussel, or clam.
• As a defense mechanism, a fluid is used to coat the irritant.
• Layer upon layer of this coating called 'nacre' is deposited until a pearl is formed.
In simple words: A natural pearl forms when an irritant, often a parasite, enters a mollusk like an oyster, which then coats the irritant with layers of nacre as a defense, eventually forming a pearl.

🎯 Exam Tip: Focus on the irritant, the mollusk's defense mechanism, and the substance 'nacre' when explaining pearl formation.

 

Question 2. Which oceanic organism develops in it?
Answer: The oceanic organism oyster develops in it.
In simple words: Oysters are the primary marine organisms known for producing natural pearls.

🎯 Exam Tip: Knowing specific examples of marine life related to economic or ecological significance is beneficial.

 

Question 3. In which sea is it found in India?
Answer: The Arabian Sea.
In simple words: Pearl-producing oysters are historically found in the Arabian Sea region near India.

🎯 Exam Tip: Geographical location can be important for resources; connect specific resources to their relevant regions.

 

What Will You Do?

Question 1. Different marine animals like the blue whale, turtle, starfish, etc. appear before you in your dream and complain to you. They say, "You humans are not allowing us to live properly. You throw the waste and chemicals that you do not want into our house. The youngsters in our house are falling ill due to this. Some are getting killed. You must think about this situation and remove the pollution from the seas." Now tell what you will do.
Answer: "Environmental problems begin with people as the cause and end with people as the victims." Different ways to remove pollution from sea are:
• Creating awareness amongst people.
• Organising a clean-up operation.
• Insisting that government take steps to prevent marine pollution caused due to waste disposal.
• Following the principle of recycling waste and proper treatment of sewage before its disposal into water bodies.
• Generating a sense of responsibility amongst the citizens.
In simple words: To address marine pollution, I would promote public awareness, organize clean-up drives, advocate for government action on waste disposal, encourage waste recycling and sewage treatment, and foster a sense of civic responsibility.

🎯 Exam Tip: For action-oriented questions, provide a multi-faceted approach, including individual, community, and governmental responsibilities.

 

Can You Do It?

Question 1. Sameer and Sania are playing a game of showing the waterways on a map of the world. Their routes are going in opposite directions. One of the following the eastern route while the other is making a route that takes to the west. From Mumbai port some goods are to be taken to London in UK. On a map of the world, show at least two such routes with a pencil. Write down the names of the ports of different nations that fall on the route followed by each.

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र विश्व मानचित्र पर दो काल्पनिक समुद्री व्यापार मार्गों को दर्शाता है: 'समीर का मार्ग' (पश्चिमी मार्ग, बिंदीदार रेखा) और 'सानिया का मार्ग' (पूर्वी मार्ग, ठोस रेखा)। समीर का मार्ग भारत से पश्चिम की ओर यूरोपीय देशों तक जाता है, जबकि सानिया का मार्ग भारत से पूर्व की ओर एशियाई देशों से होते हुए पश्चिमी प्रशांत क्षेत्र तक जाता है। यह छात्रों को वैश्विक समुद्री व्यापार और मार्गों को समझने में मदद करता है।
Answer:
Ports on the route followed by Sameer:
• JNPT - India
• Nish tun - Yemen
• Salal - Oman
• Port of Berbera - Somalia
• Port of A1 Qusayr - Egypt
• Port of Said - Egypt Suez
• port - Egypt
• Port of Tenes - Algeria
• Port of Tunis - Tunisia
• Port of Bone facia - France
• Port of Aguilas - Spain
• Port of Adra - Spain
• Port of Gibraltar - Gibraltar
• Port of Sines - Portugal
• Swange Pier - UK
• Whitstable harbour - UK
• Purfleet Thames Terminal - UK
• Port of London - UK
Ports on the route followed by Sania:
• Port of Mergui - Myanmar
• Port of Ramong - Thailand
• Port of Krueng Raya - Indonesia, etc.
In simple words: To transport goods from Mumbai to London, Sameer's western route would involve passing through the Indian Ocean, Suez Canal, Mediterranean Sea, and Atlantic Ocean, stopping at ports like JNPT, Salal, Said, Gibraltar, and London. Sania's eastern route would go through the Indian Ocean, Pacific Ocean, and North Atlantic Ocean, with ports like Mergui, Ramong, and Krueng Raya on the way, eventually reaching London.

🎯 Exam Tip: For questions involving routes and geographical features, listing key waypoints (ports, canals, oceans) in order is important for a complete answer.

 

Question 2. Which of the routes you feel is shorter? That of Sameer's or Sania's?
Answer: Sameer's route is shorter.
In simple words: Sameer's route, likely utilizing the Suez Canal, is generally shorter for travel between Mumbai and London compared to Sania's route, which would probably involve circumnavigating the globe via eastern seas.

🎯 Exam Tip: Geographical knowledge of major canals (like Suez and Panama) and their impact on global shipping routes is crucial.

 

Question 3. Which oceans does one have to pass through if one follows Sameer's route or Sania's route?
Answer: If one follows Sameer's route one has to pass through the Indian Ocean and North Atlantic Ocean. If Sania's route is taken she has to pass through the Pacific and North Atlantic Ocean.
In simple words: Sameer's route (western) mainly traverses the Indian and North Atlantic Oceans, while Sania's route (eastern) involves the Pacific and North Atlantic Oceans.

🎯 Exam Tip: Tracing the path on a world map helps confirm the oceans involved in each route.

 

Question 4. What are Panama and Suez? For what purpose were they constructed?
Answer:
• Panama and Suez are the canals in the sea built for commercial purpose.
• It helped in saving time, money and energy and gave a fillip to international trade due to the shorter distance and easy accessibility.
In simple words: The Panama and Suez Canals are man-made waterways constructed to shorten sea routes, thereby saving time, money, and fuel for commercial shipping and boosting international trade.

🎯 Exam Tip: Highlight both the "what" (canals) and the "why" (commercial purpose, efficiency, international trade) in your answer.

 

Question 5. Have they been used in Sameer's and Sania's routes?
Answer: Yes, Suez Canal is used in Sameer's route while Panama Canal is used in Sania's route.
In simple words: Yes, the Suez Canal is part of Sameer's western route from Mumbai to London, while the Panama Canal would be utilized in Sania's route if she were to circumnavigate the Americas.

🎯 Exam Tip: Understand the geographical placement of these canals to correctly assign them to appropriate global routes.

 

Class 6 Geography Chapter 6 Importance Of Oceans Additional Important Questions And Answers

Fill The Blanks Choosing The Correct Alternatives From The Brackets:

Question 1. The ________ includes all the water bodies like oceans, seas, rivers and their tributaries, lakes, reservoirs and also ground water that exist on the earth. (lithosphere, atmosphere, hydrosphere)
Answer: hydrosphere
In simple words: The hydrosphere encompasses all the water on Earth, including oceans, rivers, lakes, and groundwater.

🎯 Exam Tip: Clearly distinguish between the Earth's main spheres: lithosphere (land), atmosphere (air), and hydrosphere (water).

 

Question 2. Total global water 97.7% is contained in ________ (lakes, oceans, seas)
Answer: oceans
In simple words: The vast majority (97.7%) of Earth's total water is found in its oceans.

🎯 Exam Tip: Knowing the approximate percentages of Earth's water distribution (e.g., oceans vs. freshwater) is a common general knowledge point.

 

Question 3. The ocean with an area 166,240,977 sq. km is the ________ ocean. (Indian, Atlantic, Pacific)
Answer: Pacific
In simple words: The Pacific Ocean is the largest ocean by area, spanning approximately 166,240,977 square kilometers.

🎯 Exam Tip: Memorizing the relative sizes of major oceans can help in answering such factual questions.

 

Question 4. All rivers flowing from mountains or hilly areas finally meet in the ________.(lakes, seas, oceans)
Answer: oceans
In simple words: Rivers, originating from high elevations, ultimately discharge their water into the oceans.

🎯 Exam Tip: This question reiterates the concept of river systems flowing towards the largest water bodies, the oceans.

 

Question 5. Salinity is expressed in terms of ________ (mils, ml, gms)
Answer: mils
In simple words: Salinity, the measure of salt content in water, is typically expressed in parts per thousand, often denoted as "mils."

🎯 Exam Tip: Understand the standard units of measurement for scientific concepts; "mils" refers to parts per thousand for salinity.

 

Question 6. The average salinity of oceanic water is ________ (80%, 332%, 35%)
Answer: 35%
In simple words: On average, the salinity of ocean water is about 35 parts per thousand, or 3.5%.

🎯 Exam Tip: It's important to know the approximate average values for key oceanic properties like salinity.

 

Question 7. The salinity of the Dead Sea is ________.(332 %, 35%, 60%)
Answer: 332%
In simple words: The Dead Sea has an extremely high salinity of approximately 332 parts per thousand, making it one of the saltiest water bodies on Earth.

🎯 Exam Tip: The Dead Sea is an exception to average ocean salinity; remember its uniquely high salt concentration.

 

Question 8. About ________ of the surface of the earth is occupied by water. (90%, 95%, 70.8%)
Answer: 70.8%
In simple words: Approximately 70.8% of the Earth's surface is covered by water, primarily by oceans.

🎯 Exam Tip: Knowing the proportion of Earth's surface covered by water is a basic geographical fact often tested.

 

Question 9. Salt as a substance is obtained by constructing ________ (sea bed, salt pan, river bunds)
Answer: salt pan
In simple words: Salt is primarily harvested from seawater by evaporating water in shallow pools known as salt pans.

🎯 Exam Tip: Understand the traditional methods of extracting resources like salt from the ocean.

 

Question 10. ________ is conducted on a much higher scale as compared to the other modes of transport. (Water transport, Air transport, Road transport)
Answer: Water transport
In simple words: Water transport handles a significantly larger volume of goods globally compared to air or road transport, especially for heavy and bulky items.

🎯 Exam Tip: Compare the capacities and efficiencies of different transport modes to understand why water transport is favored for large-scale logistics.

 

Question 11. Pollution of ________ water is caused due to oil spills. (river, lake, oceanic)
Answer: oceanic
In simple words: Oil spills primarily cause pollution in oceanic waters, posing significant threats to marine ecosystems.

🎯 Exam Tip: Associate specific types of pollution (e.g., oil spills) with the environments they most commonly affect (e.g., oceans).

 

Question 12. Winds blowing due to pressure difference in the belts is called ________ (planetary winds, oceanic winds, minerals)
Answer: planetary winds
In simple words: Large-scale, consistent winds driven by global pressure differences are known as planetary winds.

🎯 Exam Tip: Recognize that global wind patterns are primarily caused by atmospheric pressure differences, leading to terms like 'planetary winds'.

 

Match The Pairs Correctly:

Question 1.

Oceans	The area in sq. km
(1) Pacific	(a) 20,327,000
(2) Atlantic	(b) 73,426,163
(3) Indian	(c) 166,240,977
(4) Southern	(d) 13,224,479
(5) the Arctic	(e) 86,557,402

Answer:
1-c
2-e
3-b
4-a
5-d
In simple words: This match correctly pairs each major ocean (Pacific, Atlantic, Indian, Southern, Arctic) with its corresponding surface area in square kilometers.

🎯 Exam Tip: Familiarize yourself with the relative and absolute sizes of the world's oceans for accurate matching exercises.

 

Find The Odd Man Out:

Question 1. Pearls, corals, diamonds, medicinal plants
Answer: diamonds
In simple words: Pearls, corals, and medicinal plants can be found in or near oceanic environments, while diamonds are primarily mined from terrestrial geological formations.

🎯 Exam Tip: Categorize items by their source (marine vs. terrestrial) to identify the odd one out correctly.

 

Question 2. Spain, Norway, Japan, India
Answer: India
In simple words: Spain, Norway, and Japan are countries with extensive coastlines heavily reliant on maritime activities, while India, though having a coastline, is often more recognized for its diverse inland geography and economy.

🎯 Exam Tip: Consider the primary geographical and economic characteristics that distinguish countries in a given list.

 

Question 3. Blue whale, sea turtles, seerfish, dolphins
Answer: seerfish
In simple words: Blue whales, sea turtles, and dolphins are marine mammals or reptiles, while seerfish is a type of bony fish, making it the odd one out in terms of biological classification.

🎯 Exam Tip: Differentiating between marine mammals, reptiles, and fish is key to answering biological classification questions.

 

Name The Following:

Question 1. Water bodies which are a part of the . hydrosphere.
Answer: Oceans, seas, rivers and their tributaries, lakes, reservoirs, ground water.
In simple words: The hydrosphere includes all forms of water on Earth, such as oceans, seas, rivers, lakes, reservoirs, and groundwater.

🎯 Exam Tip: When defining a broad geographical term like 'hydrosphere,' provide a comprehensive list of its constituent components.

 

Question 2. Percentage of global waters contained in oceans.
Answer: 97.7%
In simple words: Oceans hold 97.7% of all the water on Earth.

🎯 Exam Tip: Numerical facts like these are often directly tested; precise recall is important.

 

Question 3. Two aquatic animals found in the ocean.
Answer:
• Microscopic planktons
• Huge whales
In simple words: Two examples of aquatic animals found in the ocean are microscopic plankton and large whales.

🎯 Exam Tip: When asked for examples, choose diverse options that highlight the range of life forms, from microscopic to very large.

 

Question 5. Places where volcanic eruptions occur.
Answer:
• Land
• Ocean
In simple words: Volcanic eruptions can occur on land, forming mountains and volcanoes, as well as on the ocean floor, creating mid-ocean ridges and islands.

🎯 Exam Tip: Remember that volcanic activity is not exclusive to landmasses; underwater volcanoes are common and significant.

 

Question 6. Two minerals obtained from the sea.
Answer:
• Phosphates
• Sulphates
In simple words: Phosphates and sulphates are two examples of minerals that can be extracted or found in the sea.

🎯 Exam Tip: List specific mineral names rather than generic terms to demonstrate precise knowledge.

 

Question 7. Two uses of marine animals.
Answer:
• Production of fertilisers
• Production of pharmaceuticals
In simple words: Marine animals are utilized in industries for producing fertilizers and for developing various pharmaceuticals.

🎯 Exam Tip: Focus on distinct applications, such as agricultural (fertilizers) and medical (pharmaceuticals), when listing uses.

 

Question 8. Two countries with coastline which largely depends on the sea for their livelihood.
Answer:
• Seychelles
• Mauritius
In simple words: Seychelles and Mauritius are island nations whose economies and livelihoods are heavily dependent on marine resources and activities like tourism and fishing.

🎯 Exam Tip: Small island nations often exhibit the highest dependence on the sea for their economy and sustenance.

 

Question 9. The controller of global temperature and source of rains.
Answer: Oceans.
In simple words: Oceans play a critical role in regulating global temperatures and are the primary source of atmospheric moisture, leading to rainfall.

🎯 Exam Tip: The moderating effect of oceans on climate and their role in the water cycle are fundamental concepts.

 

Question 10. The beginning and end of the water cycle takes place here.
Answer: Oceans.
In simple words: Oceans are the starting point for evaporation and the ultimate destination for precipitation and runoff in the water cycle.

🎯 Exam Tip: Understand the continuous nature of the water cycle and the central role oceans play in it.

 

Question 11. Two minerals obtained from the ocean floor.
Answer:
• Cobalt
• Sodium
In simple words: Cobalt and sodium are two examples of minerals that can be found and extracted from the ocean floor.

🎯 Exam Tip: Be specific with mineral names; many valuable minerals exist on or under the seabed.

 

Question 12. Precious items obtained from the seas.
Answer:
• Pearls
• Corals
In simple words: Pearls and corals are two precious items harvested from the seas, valued for their beauty and use in jewelry.

🎯 Exam Tip: Focus on items considered valuable or luxurious when asked for "precious items."

 

Question 13. Mode of transport used for large scale transportation of goods.
Answer:
• Ships
• Trawlers
In simple words: Ships and trawlers are vessels commonly used for the large-scale transportation of goods across oceans and seas.

🎯 Exam Tip: Identify the specific types of vessels associated with large-scale water transport.

 

Question 14. Two actions by man which has lead to large scale pollution in oceanic waters.
Answer:
• Oil spills
• Exploitative fishing
In simple words: Two human actions that cause significant oceanic pollution are oil spills and unsustainable, exploitative fishing practices.

🎯 Exam Tip: Connect human activities directly to their negative environmental impacts, such as pollution.

 

Answer The Following In One Sentence Each:

Question 1. What happens when aquatic animals die?
Answer: When aquatic animals die, their remains accumulate in the oceans.
In simple words: The dead bodies of aquatic animals settle and gather on the ocean floor.

🎯 Exam Tip: Consider the immediate physical consequence of death for marine organisms in the context of the ocean environment.

 

Question 2. What enters the ocean with the rain water?
Answer: Sediments from eroded lands, trees and bushes flowing with water, dead remains, etc. enter the ocean with the river water.
In simple words: Rainwater carries eroded sediments, organic matter from plants, and other debris from land into the oceans via rivers.

🎯 Exam Tip: Focus on the types of terrestrial materials that are transported by water runoff into the marine environment.

 

Question 3. What happens when the dead remains in the ocean decompose?
Answer: When the dead remains in the oceans decompose it releases various minerals and salts in the ocean water.
In simple words: Decomposing dead remains in the ocean release minerals and salts, enriching the water with nutrients.

🎯 Exam Tip: Understand decomposition as a natural process that recycles nutrients and minerals back into the ecosystem.

 

Question 10. How does oceanic pollution affect the aquatic animals?
Answer: Due to oceanic pollution many aquatic animals are under the threat of being extinct. For example, the blue whale, some types of sea turtles, dolphins, etc.
In simple words: Oceanic pollution threatens many sea animals like whales and dolphins with extinction.

🎯 Exam Tip: Focus on specific examples of endangered marine life when discussing pollution impacts.

 

Question 11. Which items does man get from the oceans?
Answer: Salt, fish, shells and other products, minerals like iron, lead, cobalt, sodium, manganese, chromium, zinc, mineral oil and natural gas are the items man gets from oceans.
In simple words: Oceans provide humans with resources such as salt, fish, shells, various minerals (iron, lead, cobalt), and energy sources like oil and natural gas.

🎯 Exam Tip: Remember a diverse range of resources, from food and minerals to energy and bioproducts.

 

Question 12. Which continents are located along the coast of the Pacific Ocean?
Answer: Asia, Australia, North America and South America are the continents located along the coast of the Pacific Ocean.
In simple words: The continents bordering the Pacific Ocean are Asia, Australia, North America, and South America.

🎯 Exam Tip: Memorizing the major continents bordering each ocean is fundamental geographical knowledge.

Give Geographical Reasons For The Following Statements:

 

Question 1. The ocean water is saltier than drinking water.
Answer:
(i) In drinking water, the proportion of salts is quite low. Water from oceans and seas has a greater amount of salt. Hence it tastes salty.
(ii) Volcanic eruptions leads to increase in the level of salts and minerals in ocean water.
(iii) Volcanic eruptions takes place in the oceans. During volcanic eruptions different minerals, ashes, salts and gases are added to the water. This increases the level of salts and minerals in ocean water.
(iv) Due to continuous evaporation of oceanic water, the proportion of salt increase.
In simple words: Ocean water is saltier than drinking water because it contains a higher concentration of dissolved salts and minerals, which increase through volcanic activity and continuous evaporation.

🎯 Exam Tip: Note the two main reasons for ocean salinity: dissolved minerals from eruptions and increased concentration due to evaporation.

 

Question 2. The temperature in coastal areas remains equable.
Answer:
(i) In regions close to the oceans, seas or large reservoirs, there is not much of a difference in the temperature throughout the day.
(ii) The main reason for this is the mixing of vapour released through evaporation of water from these water bodies into air.
(iii) This vapour in the air absorbs and stores the heat released from the land.
(iv) Hence, the temperature in coastal regions remain equable.
In simple words: Coastal areas experience stable temperatures because the large water bodies moderate the climate by releasing vapor that absorbs and stores heat, reducing extreme daily temperature differences.

🎯 Exam Tip: Explain how water's high specific heat capacity and evaporation help regulate coastal temperatures, leading to an "equable" climate.

 

Question 3. It is economic to carry out transport by water ways.
Answer:
• Waterways is a cost-effective, fuel efficient and relatively more environment friendly means of transportation.
• Large scale transport of goods can be carried out with the help of ships, trawlers, boats, etc. at a low cost.
• So it is economic to carry out transport by waterway.
In simple words: Waterways are an economical choice for transport because they are cost-effective, fuel-efficient, and allow large volumes of goods to be moved at low prices using ships and boats.

🎯 Exam Tip: When discussing the economy of waterways, emphasize cost-effectiveness, fuel efficiency, and large-scale cargo capacity.

 

Question 4. There is a difference in the climate of regions close to the oceans and regions far away from the oceans.
Answer:
(i) The oceans influence the climatic condition of a place. Coastal areas are cooler and wetter than regions away from the ocean.
(ii) There is a difference in the maximum and minimum temperature with the difference being less in coastal region (nearness to the sea) while it is more in the region far away from the sea (continentality).
(iii) The temperature in coastal areas remains equable due to the mixing of vapour released through evaporation of water from these water bodies into air. This vapour absorbs and stores the heat released from the land.
In simple words: Regions near oceans have a milder, wetter climate with smaller temperature variations, while inland regions experience more extreme temperature swings due to the ocean's moderating effect on weather.

🎯 Exam Tip: Highlight the concept of 'continentality' versus 'maritime influence' to explain temperature differences between coastal and inland areas.

 

Question 5. Oceans act as the controller of global temperature.
Answer:
(i) Winds move the oceanic water in the form of currents.
(ii) Ocean currents move from the equatorial region to polar regions and from polar regions to the equatorial region.
(iii) This leads to the redistribution of heat on the earth.
(iv) The cold currents moving towards the equatorial region making the temperature of coastal areas in that zone milder whereas the warm currents coming in the colder region cause the temperature in coastal areas to rise. Hence, the oceans act as the controller of global temperature.
In simple words: Oceans control global temperatures by distributing heat around the Earth through ocean currents, which move warm water from the equator to the poles and cold water back, moderating coastal climates worldwide.

🎯 Exam Tip: Focus on ocean currents as the primary mechanism for heat redistribution and global temperature regulation.

Answer The Following Questions In Brief:

 

Question 1. What are planetary winds?
Answer:
• Equatorial regions receives perpendicular sunrays.
• As a result these areas get more heat whereas the polar regions receive highly slant rays.
• This differential heating creates imbalance in the temperature of air in different parts leading to formation of belts of high and low pressure on earth.
• Winds blow due to the pressure differences in these belts. These winds are called Planetary Winds.
In simple words: Planetary winds are large-scale winds caused by uneven heating of the Earth's surface, which creates pressure differences between equatorial and polar regions, driving global air circulation.

🎯 Exam Tip: Relate planetary winds to the differential heating of the Earth and the resulting high and low-pressure belts.

 

Question 2. Write in brief about oceanic transport.
Answer:
• Oceans have provided us the most economic option of transportation.
• Large scale transportation of goods is carried out with the help of ships, trawlers, boats, etc.
• International trade is carried out on a large scale using waterways.
• Countries like Spain, Norway, Japan have a good coastline due to which goods are transported by ocean routes, making these countries important.
In simple words: Oceanic transport is a highly economical method for moving goods globally, facilitated by large vessels like ships, enabling extensive international trade, especially for countries with long coastlines.

🎯 Exam Tip: Mention oceanic transport's economic advantage, capacity for large-scale goods, and importance for international trade, especially for coastal nations.

 

Question 3. How do ocean currents aid water transport?
Answer:
• Ocean currents are quite important in water transport.
• As far as possible water transport is carried out along ocean currents.
• They accelerate the speed of the ships and also save fuel to a considerable extent.
In simple words: Ocean currents significantly help water transport by allowing ships to travel along them, which increases speed and reduces fuel consumption, making voyages more efficient.

🎯 Exam Tip: Explain that ocean currents act as natural "conveyor belts" for ships, increasing efficiency and saving fuel.

 

Question 4. List the causes that lead to large scale pollution of oceanic water.
Answer: The causes that lead to large scale pollution of oceanic water are:
• Oil spills.
• Releasing the waste produced in the coastal cities into the seas.
• Materials thrown out from ships.
• Exploitative fishing.
• Cutting of mangrove forests in coastal areas.
• Disasters caused by the water mines.
• Sewage released by industries and cities.
• Excavation carried out in the seas.
In simple words: Major causes of ocean pollution include oil spills, untreated waste from coastal cities, discarded materials from ships, overfishing, destruction of mangroves, and impacts from underwater mining.

🎯 Exam Tip: Categorize pollution causes into industrial (oil, sewage), domestic (waste from cities, ships), and environmental destruction (mangroves, overfishing, mining).

Do It Yourself!

 

Question 1. Calculate the difference between the mean maximum and minimum temperature and write in the last column

Place	Country	Mean Max. Temp. °C	Mean Min. Temp. °C	Range of Temperature
Beijing	China	18.4	08.4	10
Istanbul	Turkey	18.0	10.0	08
Madrid	Spain	19.0	09.0	10
New York	United States	16.3	08.3	08
Denver	United States	16.2	02.2	14
Kabul	Afghanistan	14.7	05.2	09.5
Baghdad	Iraq	30.4	14.7	15.7

 

Question 2. Highlight the rows for the places having a range of temperatures over 10°C with red colour, other rows in blue colour (Refer the above table)
Answer: The student is expected to apply the specified color-coding to the table rows based on the calculated temperature range values to visually distinguish them. Places with a range over 10°C are Denver and Baghdad.
In simple words: Students are asked to visually distinguish data rows in the table based on temperature ranges, using red for ranges over 10°C and blue for others.

🎯 Exam Tip: This question encourages data analysis and visual representation skills, important for understanding climatic patterns.

 

Question 3. Find the locations of these places from an atlas. (Students activity)
Answer: This is a student activity. Students should use an atlas to locate the mentioned places and understand their geographical positions.
In simple words: Students should locate the listed cities on a world atlas to understand their geographical positions.

🎯 Exam Tip: Practicing atlas skills helps in building geographical awareness and spatial reasoning.

 

Question 4. Which places are closer to the oceans? Tell whether the range of temperature at these places is less or more?
Answer: Istanbul and New York are closer to the oceans. These places which are closer to the oceans have lesser range of temperature.
In simple words: Istanbul and New York, being closer to oceans, exhibit a smaller annual temperature range due to the moderating effect of large water bodies.

🎯 Exam Tip: Connect coastal proximity to temperature stability, understanding that oceans buffer extreme temperature fluctuations.

 

Question 5. What might be the main reason leading to differences in the temperature range in different places?
Answer: The main reason leading to differences in temperature range in different places is because of the location of the place on the planet earth. Other factors like latitude, altitude, atmosphere, ocean currents, planetary winds etc. too have their impact.
In simple words: Temperature range differences across places are mainly due to their geographic location, influenced by latitude, altitude, atmospheric conditions, ocean currents, and planetary winds.

🎯 Exam Tip: When analyzing temperature variations, consider multiple geographical and atmospheric factors that contribute to local climate.

 

Question 6. In which thermal zone are all these places located?
Answer: All these places are located in the temperate thermal zone.
In simple words: All the listed places fall within the temperate thermal zone, characterized by moderate temperatures between tropical and polar regions.

🎯 Exam Tip: Understand the definition and characteristics of the temperate thermal zone in relation to global climate patterns.

 

Question 7. Which places are far away from the oceans? Do these places have a greater or smaller temperature range?
Answer: Istanbul, Denver, Kabul and Baghdad are far away from the ocean as these places have a greater temperature range.
In simple words: Istanbul, Denver, Kabul, and Baghdad are located far from oceans and consequently experience a greater range of temperatures, characteristic of continental climates.

🎯 Exam Tip: Distinguish between maritime and continental climates, noting how distance from the ocean affects temperature extremes.

 

Question 8. Mention the places having the smallest and greatest temperature ranges.
Answer: Istanbul and New York have the smallest temperature range while Baghdad has the greatest temperature range.
In simple words: Istanbul and New York show the smallest temperature ranges, while Baghdad records the greatest temperature range among the given locations.

🎯 Exam Tip: Be able to identify and compare temperature ranges from data to highlight extremes and moderating influences.

 

Question 9. Draw a graph for the above data. Use a proper colour scheme.
Answer:
ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र विभिन्न देशों में औसत अधिकतम और न्यूनतम तापमान को दर्शाता है। क्षैतिज अक्ष पर शहर (बीजिंग, इस्तांबुल, मैड्रिड, न्यूयॉर्क, डेनवर, काबुल, बगदाद) हैं, जबकि ऊर्ध्वाधर अक्ष पर तापमान डिग्री सेल्सियस में है। इसमें औसत अधिकतम और औसत न्यूनतम तापमान के लिए दो रेखाएँ खींची गई हैं, जो शहरों में उनके उतार-चढ़ाव को दिखाती हैं। एक कुंजी यह भी बताती है कि कौन सी रेखा अधिकतम और न्यूनतम तापमान को दर्शाती है।
In simple words: Students are instructed to graphically represent the provided temperature data, using appropriate colors for clear visualization.

🎯 Exam Tip: This task assesses data visualization skills, emphasizing the importance of clear labeling and appropriate color coding in graphs.

6th Std Geography Questions And Answers: