9th Geography



1. Tamil Nadu has tropical climate

2. Tropical cyclones occur during the month of November

3. Teak and ebony belongs to tropical evergreen forest

4. Tamil Nadu receives moderate rainfall during south west monsoon season.

5. North east monsoon winds blow during October to November months.

6. Mangrove forest are found in vedaranyam.

7. The trees of deciduous forest shed their leaves during dry season.


1. Evergreen forest – rosewood

2. Monsoon forest – shed the leaves

3. Hot season – march to june

4. Cold season – December to February

5. Timber – forest product


1. List out the geographical factors that influence the climate of Tamil Nadu?

Physiography, nearness to sea and geographical location determine the overall climate condition of any region.

Though Tamil Nadu lies in the tropical region, the local weather conditions such as temperature, humidity, clouds and wind direction and speed change the climate condition to a greater extent.

2. Name the seasons of Tamil Nadu?

Summer(april toaugust) Ilavenil,muduvenil Chitirai, vaikasi, aani, aadi
Rainy(august to December) Khar season, khulir Avani, puratasi, iypasi, Karthigai
Winter(December to april) Mun pani, pin pani Markhazhi, thai, masi, panguni

3. Define monsoon.

The word monsoon is derived from the Arabic word ‘mausim’.

Mausim literally means season.

Monsoon refers to seasonal reversal in the wind direction between seasons.

4. Distinguish between south west monsoon and north west monsoon.

South west monsoon occurs between june and september. North east monsoon occurs between October and December.
The districts of nilgiris, kanyakumari, salem, Coimbatore, erode get rainfall. The coromandel coast of Tamil Nadu get heavy rainfall from north east monsoon.
It is summer monsoon. It is winter monsoon.
Tamil Nadu lies on the rain shadow of southwest monsoon It is associated with cyclones.

5. Distinguish between evergreen and monsoon forests.

They are called evergreen They are called tropical forest since the leaves are present always deciduous forest
They never shed their leaves They shed their leaves to avoid loss of moisture during dry season.
They are located in the places which receive more than 200cms of rainfall They are located in areas which receive rainfall between 100 and 200cms
They are found on the slopes of nilgris, anaimalai and coastal areas of Tamil Nadu They are found on the eastern slopes of western ghats.

6. East coast of Tamil Nadu does not receive much rainfall during southwest monsoon give reasons?

As the south west monsoon starts its down pour of rain in the western ghats, the western parts of Tamil Nadu receive about 150 cm of rainfall on an average.

Most of the eastern and central parts of Tamil Nadu become rain shadow regions for this season.

The amount of rainfall during this season decreases from west to east.

7. Write a short note on cyclonic rainfall.

November is the month of cyclonic rainfall.

The low pressure gets formed in the southern part of Bay of Bengal.

It intensifies the cyclonic rainfall along the coastal districts of Tamil Nadu.

8. Name a few forest product of Tamil Nadu?

The forest product of Tamil Nadu can be grouped into.

They are major and minor products.

Major products include timber and fuel wood.


1. Describe the different types of natural vegetation of Tamil Nadu of tropical evergreen forest.

These forests never shed their leaves in a particular season.

They are grown in places with rainfall about 200cms.

These forests are located along the slopes of the nilgris and anaimalai hills and the coastal areas of Tamil Nadu.

b) Tropical deciduous forest or monsoon forest:

These forest are found in places with rain fall from 100 to 200 cms a year.

They are located on the eastern slopes of western ghats.

The trees shed their leaves to avoid the loss of moisture during dry season.

c) Thorny shrub forest:

These forest are found in dry areas with low rainfall

The vegetation is widely scatterded low trees and bushes

They are highly adaptive to dry conditions with the deep roots, thick stems and fleshy leaves.

d) mangrove forest

They are found in the tropical and sub tropical tidal areas with high degree of salinity

e) Hill forest

These are found along the hill slopes with heavy rainfall

1. Give an account of the rainy seasons of Tamil Nadu?

a) South west monsoon:

The south west monsoon occurs between june and September.

The districts of Nilgiris, Kanyakumari, western parts of

Coimbatore, Dharmapuri and Dalem receive rainfall.

The western parts of Tamil Nadu receive about 150 cms of rainfall.

The state possesses thick rain bearing clouds in the months of October, November and December.

b) North east monsoon:

The north east monsoon occurs between October and December.

The coastal and interior plains of Tamil Nadu get more rainfall.

Trichy, salem and erode receive 100 – 150 cms of rainfall.

c) Cyclonic rainfall:

November is the month of cyclonic rainfall.

Low pressure gets formed in the southern part of Bay of Bengal.

It gets intensified and brings cyclonic rainfall to the coastal districts of Tamil Nadu.

2. Write about the rainfall regions of Tamil Nadu?

Rainfall regions of Tamil Nadu. distribution of rainfall(2007 –2008)

1. Very low rainfall Below 800mm Coimbatore, Tirupur
2. Low rainfall From 800mm to 1000mm Namakkal, Karur, Thoothukudi, Erode, Dharmapuri, Madurai, Tiruchirapalli, Perambalur, Krishnagiri
3. Moderate rainfall From 1000mm to 1200mm Pudukottai, Virudhunagar, Sivagangai, Thanjavur, Salem, Ramanathapuram,Theni, Vellore
4. High rainfall From 1200mm to 1400mm Thirunelveli, Thiruvannamalai, Kanyakumari
5. Very high rainfall Above 1400mm Kanchipuram, Chennai, Vilupuram, Thiruvallur, Thiruvarur, Cuddalore, Nilgiris, Nagapattinam.