Buds Public School , Dubai
Grade :9
Sub: Social Science
Reference - Natural Vegetation and Wildlife
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Natural Vegetation: The naturally growing plant cover; without human aid; is called natural
vegetation. The vegetation which has been left undisturbed by humans for a long time is
called virgin vegetation.
Flora: Plant species of a particular region or period are called flora.
Fauna: The animal species of a particular region or period are called fauna.
Factors which affect the diversity of flora and fauna:
RELIEF:
Land: Land directly and indirectly affects the natural vegetation. Nature of land influences
the type of vegetation. If the land is level and fertile, it is mainly used for farming. If the land
is uneven then grassland and woodlands develop over it.
Soil: Different types of soil are fit for different types of vegetation. For example; sandy soil is
fit for cactus and thorny bushes, while wet and marshy soil is fit for mangrove vegetation.
CLIMATE
Temperature and Humidity: Temperature and humidity are the main factors which determine
the character and extent of vegetation. An area with high temperature and high humidity
supports evergreen forest, while an area with high temperature and low humidity supports
thorny bushes.
Photoperiod (Sunlight): The duration of sunlight is called photoperiod. Photoperiod depends
on latitude, altitude, season and duration of the day. Trees grow faster in summer because of
longer photoperiod.
Precipitation: If an area gets heavy rainfall, it is suitable for the growth of dense vegetation.
On the other hand, an area with scanty rainfall is suitable for thorny bushes.
Ecosystem: All the plants and animals in an area are interdependent on each other. The plants
and animals; alongwith their physical environment make the ecosystem. A very large
ecosystem is called a biome. Biomes are identified on the basis of plants.
TYPES OF VEGETATION
There are five major types of vegetation in India: Tropical Rainforests, Tropical Deciduous
Forests, Tropical Thorn Forests and Scrubs, Montane Forests and Mangrove Forests.
Tropical Rain Forests
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The tropical rainforests are confined to areas of heavy rainfall. Such areas are in the
Western Ghats, upper parts of Assam, Tamil Nadu coast and the island groups of
Lakshadweep and Andaman & Nicobar.
Areas which receive more 200 cm of rainfall and have a short dry season are the best
area for tropical rainforest. Almost all kinds of vegetation; like trees, shrubs and
creepers; are found in such a forest. The forest has a multilayered structure.
Ebony, mahogany, rosewood, rubber and cinchona are some of the commercially
important trees of tropical rainforests.
Elephants, monkey, lemur and deer are the common animals in these forests. Apart
from them, a large number of birds, bats, sloth, scorpions and snails are also found in
tropical rainforests.
Tropical Deciduous Forests
Tropical deciduous forests are the most widespread forests of India. They are spread in those
regions which get rainfall between 200 cm and 70 cm. They are also called the monsoon
forests. The trees of tropical deciduous rainforests shed their leaves during summer.
These forests can be divided into two types on the basis of availability of water.
(a) Moist Deciduous Forest: The moist deciduous forests are found in areas which receive
rainfall between 200 cm and 100 cm. Such forests are found mainly in the eastern part of
India; like northeastern states, along the foothills of the Himalayas, Jharkhand, West Orissa
and Chhattisgarh. They are also found on the eastern slopes of the Western Ghats.
(b)Dry Deciduous Forest: The dry deciduous forests are found in those regions which receive
rainfall between 100 cm and 70 cm. Such forests are found in the rainier parts of the
peninsular plateau and the plains of Bihar and Uttar Pradesh.
Teak, bamboo, sal, shisham, sandalwood, khair, kusum, arjun, mulberry are some of the
commercially important trees in these forests. Lion, tiger, pig, deer and elephant are the
common animals in these forests. Additionally, a large variety of birds, lizards, snakes and
tortoises are found in these forests.
The Thorn Forests and Scrubs
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Thorn forests grow in those regions which receive less than 70 cm of rainfall. This
type of vegetation is found in the north-western part of India, e.g. Gujarat, Rajasthan,
Madhya Pradesh, Chhattisgarh, Uttar Pradesh and Haryana.
The main plant species in such a forest are acacia, palms, euphorbias and cactus. The
trees are scattered and they have long roots which go very deep in the ground. The
stems are succulent to conserve water. Leaves are usually modified into thorns to
prevent evaporation. Camel, rats, mice, rabbits, fox, wolf, tiger, lion, wild ass, horse,
etc. are the common animals in thorny forests.
Montane Forests
The forests in the mountainous areas are called montane forest. Different types of vegetation
are found at different altitudes in the mountains.
(a) The wet temperate type of forest is found between a height of 1000 and 2000 metre.
Evergreen broad-leaf trees such as oak and chestnut abound in such forests.
(b) Temperate forests are found between the heights of 1500 and 3000 metre. Coniferous
trees; like pine, deodar, silver fir, spruce and cedar abound in such forests.
(c) Alpine vegetation are found are heights of more than 3600 metre.
These forests are mainly found along the southern slopes of the Himalayas and at high
altitudes in southern and north-eastern India. Kashmir stag, spotted deer, wild sheep, jack
rabbit, Tibetan antelope, yak, snow leopard, squirrels, Shaggy horn wild ibex, bear, rare red
panda, sheep and goats are the common animals in these forests.
Mangrove Forests
Mangrove forests are found in the deltas of the Ganga, the Mahanadi, the Krishna, the
Godavarai and the Kaveri. Roots of the mangrove plants are submerged under water. Hollow
roots grow out vertically above water so that roots can breathe. Sundari tree is the most
common tree in such forests; especially in the Sunderban Delta. Royal Bengal Tiger is the
most famous animal of these forests. Additionally, turtles, crocodiles, gharials and snakes are
found in these forests.
WILD LIFE
There are more than 89,000 animal species in India. There are more than 1200 species of
birds in India. Elephants are found in the hot wet forests of Assam, Karnataka and Kerala.
One-horned rhinos are found in the swampy and marshy lands of Assam and West Bengal.
Wild ass and camels are found in the Rann of Kachchh and Thar Desert. Indian bison, nilgai,
chousingha, gazel and many other species of deer and some other animals are found in India.
India is the only country in the world which has both tigers and lions.
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There are fourteen biosphere reserves in India. Four out of these, the Sunderbans in
the West Bengal, Nanda Devi in Uttaranchal, the Gulf of Mannar in Tamil Nadu and
the Nilgiris (Kerala, Karnataka and Tamil Nadu) have been included in the world
network of Biosphese reserves.
The fourteen biosphere reserves are: Sunderbans, Gulf of Mannar, the Nilgiris, Nanda
Devi, Nokrek, Great Nicobar, Manas, Simlipal, Dihang-Dibang, Dibru Saikhowa,
Agasthyamalai, Kanchenjunga, Pachmari, Achanakmar-Amarkantak.
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Project Tiger, Project Rhino, Project Great Indian Bustard and many other
ecodevelopmental projects have been introduced.
89 National Parks, 49 Wildlife sanctuaries and Zoological gardens are set up to take
care of Natural heritage.