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Hydrosphere Book Back Questions 9th Social Science Lesson 15

9th Social Science Lesson 15

15] Hydrosphere

Book Back Questions with Answer and Do You Know Box Content

Do You Know?

Sylvia Earle is a famous American oceanographer. She was named as the first, “Hero for the Planet” by Time magazine for her efforts towards marine life protections. Jacques-Yves Cousteau (1910-1997) was a famous French Ocean explorer, who conducted extensive under-sea investigation. He belonged to the information service of the French Navy, and was sent on missions to Shanghai and Japan (1935-1938) and in the USSR (1939) .

Finland is known as the land of thousand lakes. There are 1,87,888 lakes in Finland.

Water table is a level below the ground, where water is found collected beneath the Earth’s surface. Aquifers are porous rock strata filled with water, found below the earth’s surface.

Geo Connect: ONGC: Oil and Natural Gas Corporation is India’s largest oil and gas exploration and production company. Its latest estimate is that about 20 million tons of oil reserves are found west of Mumbai high off shore.

A Hypsometric Curve is a graphic representation which shows the height of a certain place found on land and the height of oceans features at sea. “Hypso” means height in Greek.

Fathoms: A nautical measurement of the depth of water in the ocean. Isobath: An imaginary line on a map joining the points of equal depths. Isohaline: An imaginary line on a map joining the points of equal salinity in oceans.

Abyssal plains in the Atlantic and Indian Oceans tend to be extensive than the Pacific Ocean because, majority of the world’s largest rivers empty their sediments into either Atlantic or Indian Ocean. Eg. Amazon, Ganga and Brahmaputra rivers

Dragon Hole is the deepest known underwater sink hole in the world. The local fishermen call it the “eye” of the South China Sea.

Potential tidal energy zones of India are the Gulf of Khambhat, Gulf of Kutch and Sundarbans.

The energy of the falling wave water is used to turn hydro turbines to generate power plants have been installed at Vizhinjam in Kerala coast and Andaman and Nicobar Islands of India.

Maritime Borders: Maritime boundary of most the Countries are fixed to be 12 nautical miles from the baseline. This was fixed by the U.N. Convention on the Law of the sea 2013 whereas Jordan and Palau have 3 nautical miles as their maritime boundary and Benin, Republic of Congo, EI Salvador, Peru and Somalia have 200 nautical miles.

NIO (National Institute of Oceanography) was established in 1st January 1966. The headquarters of NIO is located at Dona Paula, Goa. It conducts research and observations to understand oceanic features, Ocean engineering, marine Archaeology etc.

The Great Barrier Reef: The Great Barrier Reef is the world’s largest coral reef system composed of 2,900 individual reefs and 900 islands stretching for about 2,000 kilometres. It covers an area of about 3,50,000 km. The reef is located in the Coral Sea, off the coast of Queensland, Australia. The Great Barrier Reef can be seen from the outer space. This sprawling coral reef system is one of the most biologically diverse places on the planet. Coral reefs are built by billions of tiny organisms, known as Coral polyps. CNN labelled it as one of the seven natural wonders of the world.

The Gangetic Dolphin was declared the National Aquatic Animal in 2010. This has become an endangered species. Are the Dolphins really at risk? If so, list out the reasons.

Choose the best answers:

1. The temperature of the ocean waters generally ____________ all greater depth.

(a) Increase

(b) Decreases

(c) Remains constant

(d) Decreases

2. Ocean currents are produced due to ______________

(a) Due to rotation of earth

(b) Due to variation in temperature

(c) Due to earth’s movement

(d) All the above

3. Consider the following statements:

1. Most of the fishing grounds occur in areas where the continental shelf is wide.

2. Fishing is well developed in warm tropical waters.

3. Mixing of warm and cold currents facilitates plant nutrients for fish.

4. Inland fishing became significant in India.

(a) 1 and 2 are correct

(b) 1 and 3 are correct

(c) 2, 3 and 4 are correct

(d) 1, 2 and 3 are correct

4. The oceanic ridge comes into existence due to

(a) Convergence of tectonic plates

(b) Divergence of tectonic plates

(c) Lateral movements of plates

(d) Steering of plates

5. Which of the following indicates the correct sequence of the topography beneath the surface of the sea?

(a) Continental Shelf-Continental Slope-Sea Plain-Sea trench

(b) Continental Slope-Continental Shelf-Sea Plain-Sea trench

(c) Sea Plain-Continental Slop-Continental Shelf-Sea trench.

(d) Continental Shelf-Sea Plain-Continental Shelf-Sea trench.

6. Which of the following is not correctly matched?

(a) Gulf Stream – Pacific Ocean

(b) Labrador Current – North Atlantic Ocean

(c) Canary current – Mediterranean Sea

(d) Mozambique current – Indian Ocean

Consider the following the statements and tick the appropriate answer:

(a) Both A and R are correct and R explains A

(b) Both A and R are correct but R does not explain A

(c) A is correct but R is false

(d) A is false but R is correct

1. Assertion (A): Oceans are always shown in blue in maps.

Reason (R): It indicates the natural colour of the oceans.

2. Assertion (A): Flat topped seamounts are known as Guyot.

Reason (R): All guyot features are of volcanic origin.

3. Assertion (A): Submarine canyons are deep gorges on the ocean floor.

Reason (R): They are mainly restricted to continental shelf, slope and rise.

4. Assertion (A): Atolls are more common in the Atlantic Ocean.

Reason (R): The marine population at the depth is less.

Match the following:

1. Mariana trench – Decreases salinity in the oceans.

2. Great Barrier Reef – Along the coast of Japan

3. Spring tides – Deepest point in the pacific

4. Heavy rains – Australia

5. Kuroshio current – Second order landform

6. Continental slope – On full and new moon days

Answers:

Choose the correct answers:

1. Decreases 2. Due to rotation of earth, earth’s movement and variation in temperature. 3. Statement 1, 2, 3 are correct 4. Divergence of tectonic plates 5. Continental Shelf-Continental Slope-Sea Plain-Sea trench 6. Gulf Stream – Pacific Ocean and Canary current – Mediterranean Sea

Consider the following statement and choose the correct answer:

1.Both A and R are correct and R explains A

2.A is correct but R is false

3.Both A and R are correct but R does not explain A

4.A is false but R is correct

Match the following:

1. Deepest point in the pacific 2. Australia 3. On full and new moon days 4. Decreases salinity in the oceans 5. Along the coast of Japan 6. Second order landform

9th Social Science Lesson 15

15] Hydrosphere

Do You Know?

Sylvia Earle is a famous American oceanographer. She was named as the first, “Hero for the Planet” by Time magazine for her efforts towards marine life protections. Jacques-Yves Cousteau (1910-1997) was a famous French Ocean explorer, who conducted extensive under-sea investigation. He belonged to the information service of the French Navy, and was sent on missions to Shanghai and Japan (1935-1938) and in the USSR (1939) .

Finland is known as the land of thousand lakes. There are 1,87,888 lakes in Finland.

Water table is a level below the ground, where water is found collected beneath the Earth’s surface. Aquifers are porous rock strata filled with water, found below the earth’s surface.

Geo Connect: ONGC: Oil and Natural Gas Corporation is India’s largest oil and gas exploration and production company. Its latest estimate is that about 20 million tons of oil reserves are found west of Mumbai high off shore.

A Hypsometric Curve is a graphic representation which shows the height of a certain place found on land and the height of oceans features at sea. “Hypso” means height in Greek.

Fathoms: A nautical measurement of the depth of water in the ocean. Isobath: An imaginary line on a map joining the points of equal depths. Isohaline: An imaginary line on a map joining the points of equal salinity in oceans.

Abyssal plains in the Atlantic and Indian Oceans tend to be extensive than the Pacific Ocean because, majority of the world’s largest rivers empty their sediments into either Atlantic or Indian Ocean. Eg. Amazon, Ganga and Brahmaputra rivers

Dragon Hole is the deepest known underwater sink hole in the world. The local fishermen call it the “eye” of the South China Sea.

Potential tidal energy zones of India are the Gulf of Khambhat, Gulf of Kutch and Sundarbans.

The energy of the falling wave water is used to turn hydro turbines to generate power plants have been installed at Vizhinjam in Kerala coast and Andaman and Nicobar Islands of India.

Maritime Borders: Maritime boundary of most the Countries are fixed to be 12 nautical miles from the baseline. This was fixed by the U.N. Convention on the Law of the sea 2013 whereas Jordan and Palau have 3 nautical miles as their maritime boundary and Benin, Republic of Congo, EI Salvador, Peru and Somalia have 200 nautical miles.

NIO (National Institute of Oceanography) was established in 1st January 1966. The headquarters of NIO is located at Dona Paula, Goa. It conducts research and observations to understand oceanic features, Ocean engineering, marine Archaeology etc.

The Great Barrier Reef: The Great Barrier Reef is the world’s largest coral reef system composed of 2,900 individual reefs and 900 islands stretching for about 2,000 kilometres. It covers an area of about 3,50,000 km. The reef is located in the Coral Sea, off the coast of Queensland, Australia. The Great Barrier Reef can be seen from the outer space. This sprawling coral reef system is one of the most biologically diverse places on the planet. Coral reefs are built by billions of tiny organisms, known as Coral polyps. CNN labelled it as one of the seven natural wonders of the world.

The Gangetic Dolphin was declared the National Aquatic Animal in 2010. This has become an endangered species. Are the Dolphins really at risk? If so, list out the reasons.

Choose the best answers:

1. The temperature of the ocean waters generally ____________ all greater depth.

(a) Increase

(b) Decreases

(c) Remains constant

(d) Decreases

2. Ocean currents are produced due to ______________

(a) Due to rotation of earth

(b) Due to variation in temperature

(c) Due to earth’s movement

(d) All the above

3. Consider the following statements:

1. Most of the fishing grounds occur in areas where the continental shelf is wide.

2. Fishing is well developed in warm tropical waters.

3. Mixing of warm and cold currents facilitates plant nutrients for fish.

4. Inland fishing became significant in India.

(a) 1 and 2 are correct

(b) 1 and 3 are correct

(c) 2, 3 and 4 are correct

(d) 1, 2 and 3 are correct

4. The oceanic ridge comes into existence due to

(a) Convergence of tectonic plates

(b) Divergence of tectonic plates

(c) Lateral movements of plates

(d) Steering of plates

5. Which of the following indicates the correct sequence of the topography beneath the surface of the sea?

(a) Continental Shelf-Continental Slope-Sea Plain-Sea trench

(b) Continental Slope-Continental Shelf-Sea Plain-Sea trench

(c) Sea Plain-Continental Slop-Continental Shelf-Sea trench.

(d) Continental Shelf-Sea Plain-Continental Shelf-Sea trench.

6. Which of the following is not correctly matched?

(a) Gulf Stream – Pacific Ocean

(b) Labrador Current – North Atlantic Ocean

(c) Canary current – Mediterranean Sea

(d) Mozambique current – Indian Ocean

Consider the following the statements and tick the appropriate answer:

(a) Both A and R are correct and R explains A

(b) Both A and R are correct but R does not explain A

(c) A is correct but R is false

(d) A is false but R is correct

1. Assertion (A): Oceans are always shown in blue in maps.

Reason (R): It indicates the natural colour of the oceans.

2. Assertion (A): Flat topped seamounts are known as Guyot.

Reason (R): All guyot features are of volcanic origin.

3. Assertion (A): Submarine canyons are deep gorges on the ocean floor.

Reason (R): They are mainly restricted to continental shelf, slope and rise.

4. Assertion (A): Atolls are more common in the Atlantic Ocean.

Reason (R): The marine population at the depth is less.

Match the following:

1. Mariana trench – Decreases salinity in the oceans.

2. Great Barrier Reef – Along the coast of Japan

3. Spring tides – Deepest point in the pacific

4. Heavy rains – Australia

5. Kuroshio current – Second order landform

6. Continental slope – On full and new moon days

Answers:

Choose the correct answers:

1. Decreases 2. Due to rotation of earth, earth’s movement and variation in temperature. 3. Statement 1, 2, 3 are correct 4. Divergence of tectonic plates 5. Continental Shelf-Continental Slope-Sea Plain-Sea trench 6. Gulf Stream – Pacific Ocean and Canary current – Mediterranean Sea

Consider the following statement and choose the correct answer:

1.Both A and R are correct and R explains A

2.A is correct but R is false

3.Both A and R are correct but R does not explain A

4.A is false but R is correct

Match the following:

1. Deepest point in the pacific 2. Australia 3. On full and new moon days 4. Decreases salinity in the oceans 5. Along the coast of Japan 6. Second order landform

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