Exercises1. Answer the following questions briefly:
- Which winds bring rainfall in India? Why is it so important?
Ans.Southwest monsoon winds that blow from Arabian Sea towards the land bring rainfall in India. Monsoon is very important as the agriculture of India is mainly dependent on these rains.
- Name the different seasons in India.
Ans.The major seasons of India are:
(i) Winter season from December to February
(ii) Summer season from March to May
(iii) Monsoon / Rainy season from June to September and
(iv) Retreating monsoon / Autumn during the months of October and November.
- What is natural vegetation?
Ans. The grasses, shrubs and trees which grow on their own without the help from human beings are called natural vegetation.
- Name the different types of vegetation found in India.
Ans. There are five different types of natural vegetation found in India. These are:
(i)Tropical Evergreen Forest
(ii) Tropical Deciduous Forest
(iii) Thorny Bushes
(iv) Mountain Vegetation and
(v) Mangrove Vegetation.
- What is the difference between evergreen forest and deciduous forest?
Ans.The forests that grow in the regions of heavy rainfall and always appear green are called evergreen forests. These forests are dense and the sunlight does not reach the ground.
While deciduous forests which are also known as monsoon forests are less dense. And the trees in the forest shed their leaves during the autumn.
- Why is tropical rain forest also called evergreen forest?
Ans. Tropical rain forest grows in the region that receives high rainfall. As the trees always appear green due to heavy rainfall, these forests are also called evergreen forests.
- Define weather and climate.
Ans. The day to day changes in the atmospheric temperature, rainfall, sunshine etc of a region is termed as weather. Climate is the average weather condition of a region measured over many years.
- What are coniferous trees?
Ans. The trees on high mountains that are conical in shape are called coniferous trees.
- Why are forests necessary? OR What is the importance of forests.
Ans. Forests are very useful to us as they perform various important functions. Plants in the forests enrich the atmosphere with oxygen and take the carbon dioxide breathed out by us. The roots of the trees bind the soil and help in controlling soil erosion and also control the force of flash floods. Forest trees provide us with many products like timber for furniture, fuel wood, fodder, medicinal plants, lac, honey, gum etc.
(a) World's highest rainfall occurs in
Ans. (iii) Mawsynram
(b) Mangrove forests can thrive in
(i) saline water
(ii) fresh water
(iii) polluted water
Ans. (i) saline water
(c) Mahogany and rosewood trees are found in
(i) mangrove forests
(ii) tropical deciduous forests
(iii) tropical evergreen forests
Ans. (iii) tropical evergreen forests
(d) Wild goats and snow leopards are found in
(i) Himalayan region
(ii) Peninsular region
(iii) Gir forests
Ans. (i) Himalayan region
(e) During the southwest monsoon period, the moisture laden winds blow from
(i) land to sea
(ii) sea to land
(iii) plateau to plains
Ans. (ii) sea to land
3. Fill in the blanks:
(a) Hot and dry winds known as loo blow during the day in summer.
(b) The states of Andhra Pradesh and Tamil Nadu receive a great amount of rainfall during the season of retreating monsoon.
(c) Gir forest in Gujarat is the home of Asiatic lions.
(d) Sundari is a well known species of mangrove forests.
(e) Tropical deciduous forests are also called monsoon forests.