GCERT Class 9 Social Science Chapter 16 Solution
Brief Information: This post contains the solution for Chapter 19 Climate of Class 9 Social Science (SS) of the Gujarat Board (GSEB) books GCERT.
Q.1 Answer the following questions in brief
(1) ‘Himalaya is a natural wall which protects India’. How ?
Ans. Himalaya performs the following function 1) Protection of India by obstructing the cold winds blowing from the north east Asia in winter season. 2) Obstructing the monsoonal wind and making the rain. It becomes the source of water for major river systems of India. Thus, Himalaya is a natural wall which protects India.
(2) Explain the ‘Trade Winds’.
Ans. The North east winds blowing over the India due to higher pressure in northern hemisphere are called Trade winds. They are named so because they were used in past for oceanic trade.
(3) Into how many parts has the Indian Meteorological Department divided the seasons of India ? Which are they ?
Ans. Indian Meteorological Department of Government of India at Delhi has divided the climate of India into four seasons :
(1) Cold Weather season – Winter – December to February
(2) Hot Weather season – Summer – March to May
(3) Advancing Monsoon – Rainy season – June to September
(4) Retreating Monsoon season – October to November
(4) Into how many branches are the North-West monsoon winds divided ? Which are they ?
Ans. The North-West monsoon winds are divided into two branches:
1. Arabian Sea Branch
2. Bay of Bengal Branch
Q.2 Answer the following questions as directed
(1) What changes occur with the increase in altitude from sea level ?
Ans. As the altitude from sea level increases there is 1) decrease of air pressure 2) decrease of temperature – in general air temperature decreases @ 1° C for the ascent of 165 meters or by 6.50 C for an ascent of every 1000 meters from the surface of the earth. and 3) Increase of rainfall.
(2) What is meant by ‘October Heat ?
Ans. At time of retreating monsoon between month of October to November, a season of dry and cool winds starts instead of hot summer. Clear sky and increasing temperature are main characteristics. Soil contains moisture, day time temperature increases, night is cool and pleasant. Day time weather is very perplexing due to high temperature and humidity. This situation is known as ‘October Heat’
(3) Over which regions do the monsoon winds coming from over the Bay of Bengal give rain ?
Ans. The monsoon winds coming from over the Bay of Bengal give rain West Bengal, Northeastern states, Bihar, Uttar Pradesh Punjab and Haryana.
(4) Which phenomena of far distant places affect the climate of India ?
Ans. El-nino a phenomenon happening over Peruvian coast of Pacific ocean along South American affects the climate of India.
Q.3 Give a to-the-point answer of the following questions
(1) Due to which reasons does the phenomena of change in season occur ?
Ans. Revolution of the earth around the sun and her axial tilt are major reasons for changes in seasons.
(2) State briefly the factors affecting the climate.
Ans. The factors that affect the climate are:
1) Latitude
2) Distance from sea
3) Altitude from sea level
4) Atmospheric pressure and wind
(3) Write notes on the cold weather season – winter of India .
Ans.
(4) Describe the effects of climate on human life.
Ans.
Q 4. Select the correct option for the following questions and write its serial number in the given against them
(1) When the sun rays are vertical over the Tropic of Cancer which season is experienced in India ?
(A) Cold season
(B) Hot season
(C) Rainy season
(D) Retreating monsoon
Ans. (B) Hot season
(2) Which place near Cherrapunji is famous for heavy rains ?
(A) Shillong
(B) Guwahati
(C) Imphal
(D) Mawsynram
Ans. (D) Mawsynram
(3) Which Himalayan phenomena affects more in creating cold wave over Gujarat and Rajasthan in
winter ?
(A) Snowfall
(B) Sandstorm
(C) Rainfall
(D) Landslide
Ans. (A) Snowfall
(4) By which name are some showers in May along Malabar coast known as ?
(A) Anarvarsha
(B) Bananavarsha
(C) Ammvarsha
(D) Snowfall
Ans. (C) Ammvarsha
(5) Which is the season of Retreating Monsoon in India ?
(A) March – May
(B) October – November
(C) January – February
(D) July – August
Ans. (B) October – November
(6) Which of the following statements is true ?
(A) Days are longer and nights are shorter in winter.
(B) Days are shorter and nights are shorter in summer.
(C) Days are shorter and nights are longer in winter.
(D) Days are shorter and nights are longer in summer.
Ans. (C) Days are shorter and nights are longer in winter.