Choose the right answer from the four al | Class 9 Social Science - Contemporary India Chapter Drainage, Drainage NCERT Solutions

Why are rivers important for the country’s economy?

Compare the east flowing and the west flowing rivers of the Peninsular plateau.

Discuss the significant difference between the Himalayan and the Peninsular rivers.

Below are given names of a few lakes of India. Group them under two categories – natural and created by human beings.

(a) Wular                                            (b) Dal
(c) Nainital                                         (d) Bhimtal
(e) Gobind Sagar                               (f) Loktak
(g) Barapani                                       (h) Chilika
(i) Sambhar                                        (j) Rana Pratap Sagar
(k) Nizam Sagar                                 (l) Pulicat
(m) Nagarjuna Sagar                         (n) Hirakund

Answer the following questions briefly.
(i) What is meant by a water divide? Give an example.
(ii) Which is the largest river basin in India?
(iii) Where do the rivers Indus and Ganga have their origin?
(iv) Name the two headstreams of the Ganga. Where do they meet to form the Ganga?
(v) Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?
(vi) Which two Peninsular rivers flow through trough?
(vii) State some economic benefits of rivers and lakes.

Write short notes on the following.
(i) The Indian Desert
(ii) The Central Highlands
(iii) The Island groups of India

Give reasons as to why.
(i) Seasonal reversal of wind direction takes place over the Indian subcontinent?
(ii) The bulk of rainfall in India is concentrated over a few months.
(iii) The Tamil Nadu coast receives winter rainfall.
(iv) The delta region of the eastern coast is frequently struck by cyclones.
(v) Parts of Rajasthan, Gujarat and the leeward side of the Western Ghats are drought-prone.

Describe the regional variations in the climatic conditions of India with the help of suitable examples.

Why does the rainfall decrease from the east to the west in Northern India.

The central location of India at the head of the Indian Ocean is considered of great significance. Why?

Name different types of Vegetation found in India and describe the vegetation of high altitudes.

Describe how the Himalayas were formed.

Give the characteristics and effects of the monsoon rainfall in India.

Answer the following questions briefly.
(i) What are the controls affecting the climate of India?
(ii) Why does India have a monsoon type of climate?
(iii) Which part of India does experience the highest diurnal range of temperature and why?
(iv) Which winds account for rainfall along the Malabar coast?
(v) What are Jet streams and how do they affect the climate of India?
(vi) Define monsoons. What do you understand by “break” in monsoon?
(vii) Why is the monsoon considered a unifying bond?

Discuss the mechanism of monsoons.

Write short notes on the following.
(i) The Indian Desert
(ii) The Central Highlands
(iii) The Island groups of India

Describe how the Himalayas were formed.

Answer the following questions briefly.
(i) Name the group of islands lying in the Arabian sea.
(ii) Name the countries which are larger than India.
(iii) Which island group of India lies to its south-east?
(iv) Which island countries are our southern neighbours?

What are the advantages of having a healthy population?

What is the relation between occupational structure and development?

Distinguish between population growth and population change.

Answer the following questions briefly.
(i) Why is the rate of population growth in India declining since 1981?
(ii) Discuss the major components of population growth.
(iii) Define age structure, death rate and birth rate.
(iv) How is migration a determinant factor of population change?

Answer the following questions briefly.
(i) Define an ecosystem.
(ii) What factors are responsible for the distribution of plants and animals in India?
(iii) What is a bio-reserve? Give two examples.
(iv) Name two animals having habitat in tropical and montane type of vegetation.

What are the significant features of the National Population Policy 2000?

(i) Migrations change the number, distribution and composition of the population in
(a) the area of departure (c) both the area of departure and arrival
(b) the area of arrival (d) none of the above

(ii) A large proportion of children in a population is a result of
(a) high birth rates (c) high death rates
(b) high life expectancies (d) more married couples

(iii) The magnitude of population growth refers to
(a) the total population of an area
(b) the number of persons added each year
(c) the rate at which the population increases
(d) the number of females per thousand males

(iv) According to the Census 2001, a “literate” person is one who
(a) can read and write his/her name
(b) can read and write any language
(c) is 7 years old and can read and write any language with understanding
(d) knows the 3 ‘R’s (reading, writing, arithmetic)