Chapter 7 Indian Ocean – Relief and Strategic Importance Solutions

A

B

C

(1) Pacific Ocean

(1) Atlantic Ocean

(1) Indian Ocean

(2) Chagos

(2) Christmas

(2) Lakshadweep

(3) Ashmore

(3) Maldives

(3) Cocos

(4) Hormuz

(4) Malacca

(4) Bab-al-Mandeb

2. Give geographical reasons.

3. Write short notes on.

The river which bring sediments to the continental shelf of the Arabian Sea are short and swift. Therefore, the sediments in the river are deposited in the Continental shelf. The rivers which bring sediments to the continental shelf of the Bay of Bengal are long, sluggish and voluminous, therefore sediments are deposited in deltas and not in the continental shelf.

There are a greater number of estuaries along the coastline of Arabian sea. There are a greater number of deltas along the coastline of the Bay of Bengal.

The beach sands along the coastline of the Arabian Sea is very rich in valuable minerals like uranium, thorium, radium, etc. Beach sands, rich in heavy minerals and offshore deposits are activity exploited by bordering countries particularly India, South Africa, Indonesia and Sri Lanka.

The Abyssal plains of Indian ocean have deposits of polymetallic nodules. These nodules are the source of nickel, copper, manganese and cobalt.

4. Answer in detail.

(b) Abyssal Plains:

(c) Ridges:

(d) Ocean Currents:

5. 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
Answer:

11th Geography Digest Chapter 7 Indian Ocean – Relief and Strategic Importance Intext Questions and Answers

Make friends with maps! (Textbook Page No. 75)

Look at the figure 7.1 and answer the following questions.

Find Out! (Textbook Page No. 77)

Why Ninety East ridge name has been given to this ridge?
Answer:

Try This. (Textbook Page No. 78)

Given below are names of some ocean basins in the Indian Ocean. Identify these in figure 7.1. 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) Mid-Indian basin (9) Ganga basin
Answer:

Can you do it?

1. Study maps given in the figure 7.2 carefully. These maps are showing the portion of Indian Ocean lying north of equator. Maps in the figure depict the temperature conditions in three seasons: (a) pre-SW monsoon (b) NE monsoon (c) during SW monsoon. Answer the following questions. (Textbook Page No. 78)

2. The given maps are depicting the salinity distribution of northern Indian Ocean. Study the maps (a) NE monsoon (b) pre-SW monsoon (c) SW monsoon given in the figure 7.3 carefully and answer the following questions. (Textbook Page No. 79)

This leads to higher salinity in the Arabian Sea as compared to the salinity of the Bay of Bengal.

This leads to higher salinity in the Arabian Sea as compared to the salinity of the Bay of Bengal.

Do you know? (Textbook Page No. 80)

See the maps in figure 7.4 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.

Can you tell? (Textbook Page No. 81)

(i) Name the Gulf countries
(ii) In which direction do they lie in the Asian continent?
Answer:
(i) The Gulf countries are Kuwait, Oman, Saudi Arabia, UAE, Qatar and Bahrain. They are called as Gulf countries because they are members of the GCC (Gulf Co-operation Council).
(ii) They lie in the western direction in the Asian continent.