Balbharati solutions for Geography (Social Science) [English] 11 Standard chapter 7 - Indian Ocean - Relief and Strategic Importance [Latest edition]

Look at the figure and answer the following questions:

1. What does this map show?
2. Which continents and sub-continents are visible on this map?
3. What lies between the continents?
4. Chagos Plateau, Sunda Trench, Central Mountain range are a part of what?
5. What are the conclusions you can draw after looking at the map?

Why Ninety East ridge name has been given to this north-south extending range in the eastern Indian Ocean (Bay of Bengal)?

Given below are the names of some ocean basins in the Indian Ocean. Identify these in figure Write a note on their locations, their separators, and the rivers entering into them. Rank these according to their size on the basis of your perception.

1. Oman basin
2. Arabian basin
3. Somali basin
4. Mauritius basin
5. Mascarene basin
6. Agulhas-Natal basin
7. West Australian basin
8. MidIndian basin
9. Ganga basin

Study maps given in the figure carefully. These maps are showing the portion of the Indian Ocean lying north of the equator. Maps in the figure depict the temperature conditions in three seasons:

1. pre-SW monsoon,
2. NE monsoon
3. during SW monsoon.

Answer the following questions.

1. Why are isotherms not drawn on the continental part?
2. Why is the temperature in the Arabian Sea lower than in the Bay of Bengal?
3. Why is the temperature higher in the southern portion of the Indian Ocean during pre SW monsoon?

Given below are the maps depicting the salinity distribution of the northern Indian Ocean. Study the maps.

1. NE monsoon,
2. pre-SW monsoon
3. SW monsoon
   given in figure carefully and answer the following questions.

1. Why does the Arabian Sea record higher salinity than the Bay of Bengal?
2. What is the minimum salinity in the Bay of Bengal? In which seasons do we find it?
3. Account for the high salinity in the Arabian Sea throughout the year?

See the maps in Figures A and B. They show the pattern of ocean currents in the Indian Ocean during different seasons.
Study the maps carefully and answer the following questions.

1. Identify the season each map is representing and name them accordingly.
2. What difference do you notice in the direction of currents between winter and summer in the Northern part of the Indian Ocean?
3. How many cold currents are there in the Indian Ocean? Name them.
4. Why do you think the cold currents are fewer in the Indian Ocean.
5. Which currents maintain the direction in both the season?
6. Can you see any circulation in the currents of the Indian Ocean? What are such circulations called? If yes name the currents sequentially.

1. Name the Gulf countries
2. In which direction do they lie in the Asian content.

Complete the chain:

Give a geographical reason:

Salinity is less in the Bay of Bengal in the Indian Ocean.

Give a geographical reason:

The eastern coastal part of the Indian Ocean is seismically active.

Give a geographical reason:

Gyre develops in the Southern Indian Ocean.

Give a geographical reason:

Temperatures are high in the pre-monsoon season in the equatorial region in the northern Indian ocean.

Write a short note on:

The width of the continental shelf in the Bay of Bengal and the Arabian Sea.

Write a short note on:

Mineral resources in the Indian ocean

Write a short note on:

Ocean currents in the Indian ocean

Write a short note on:

Oil and natural gas in the Indian ocean

Answer in detail:
Outline the importance of the Indian ocean with respect to trade and transport routes.

Answer in detail:

Evaluate the strategic location of India with respect to its location in the Indian Ocean.

Explain the Indian ocean with respect to the following aspects :

Ocean Trenches

Explain the Indian ocean with respect to the following aspects :

Abyssal Plains

Explain the Indian ocean with respect to the following aspects :

ridges

Explain the Indian ocean with respect to the following aspects :

Ocean Currents

On an outline map of the world, locate the following, and make an index:

1. Sunda Trench
2. Diego Garcia
3. SW Monsoon
4. Agulhas Current
5. West Australian Current
6. Ninety East ridge
7. Strait of Holmuz
8. Chabahar port