I. CHOOSETHE CORRECT ANSWER:
1. Tamil Nadu has tropical climate
2. Tropical cyclones occur during themonth of November
3. Teak and ebony belongs to tropicalevergreen forest
4. Tamil Nadu receives moderaterainfall during south west monsoon season.
5. North east monsoon winds blowduring October to November months.
6. Mangrove forest are found invedaranyam.
7. The trees of deciduous forest shedtheir leaves during dry season.
II. MATCHTHE FOLLOWING:
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
III.ANSWER IN BRIEF:
1. List out the geographical factorsthat influence the climate of Tamil Nadu?
Physiography, nearness to sea andgeographical location determine the overall climate condition of any region.
Though Tamil Nadu lies in the tropicalregion, the local weather conditions such as temperature, humidity, clouds andwind direction and speed change the climate condition to a greater extent.
2. Namethe seasons of Tamil Nadu?
| SEASONS | TAMIL NAME | TAMIL MONTH |
| 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. Definemonsoon.
The word monsoon is derived from theArabic word ‘mausim’.
Mausim literally means season.
Monsoon refers to seasonal reversal inthe wind direction between seasons.
4.Distinguish between south west monsoon and north west monsoon.
| SOUTH WEST MONSOON | NORTH EAST 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.
| EVERGREEN FOREST | MONSOON FOREST |
| 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. Eastcoast of Tamil Nadu does not receive much rainfall during southwest monsoongive reasons?
As the south west monsoon starts itsdown pour of rain in the western ghats, the western parts of Tamil Nadu receiveabout 150 cm of rainfall on an average.
Most of the eastern and central partsof Tamil Nadu become rain shadow regions for this season.
The amount of rainfall during thisseason decreases from west to east.
7. Write ashort note on cyclonic rainfall.
November is the month of cyclonicrainfall.
The low pressure gets formed in thesouthern part of Bay of Bengal.
It intensifies the cyclonic rainfallalong the coastal districts of Tamil Nadu.
8. Name afew forest product of Tamil Nadu?
The forest product of Tamil Nadu canbe grouped into.
They are major and minor products.
Major products include timber and fuelwood.
IV. ANSWERIN PARAGRAPH:
1.Describe the different types of natural vegetation of Tamil Nadu of tropicalevergreen forest.
These forests never shed their leavesin a particular season.
They are grown in places with rainfallabout 200cms.
These forests are located along theslopes 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 withrain fall from 100 to 200 cms a year.
They are located on the eastern slopesof western ghats.
The trees shed their leaves to avoidthe loss of moisture during dry season.
c) Thornyshrub forest:
These forest are found in dry areaswith low rainfall
The vegetation is widely scatterdedlow trees and bushes
They are highly adaptive to dryconditions with the deep roots, thick stems and fleshy leaves.
d)mangrove forest
They are found in the tropical and subtropical tidal areas with high degree of salinity
e) Hillforest
These are found along the hill slopeswith heavy rainfall
1. Give anaccount of the rainy seasons of Tamil Nadu?
a) Southwest monsoon:
The southwest monsoon occurs between june and September.
Thedistricts of Nilgiris, Kanyakumari, western parts of
Coimbatore,Dharmapuri and Dalem receive rainfall.
The westernparts of Tamil Nadu receive about 150 cms of rainfall.
The statepossesses thick rain bearing clouds in the months of October, November andDecember.
b) Northeast monsoon:
The northeast monsoon occurs between October and December.
The coastaland interior plains of Tamil Nadu get more rainfall.
Trichy,salem and erode receive 100 – 150 cms of rainfall.
c)Cyclonic rainfall:
November isthe month of cyclonic rainfall.
Low pressuregets formed in the southern part of Bay of Bengal.
It getsintensified and brings cyclonic rainfall to the coastal districts of TamilNadu.
2. Writeabout the rainfall regions of Tamil Nadu?
Rainfallregions of Tamil Nadu. distribution of rainfall(2007 –2008)
| S.No. | DISTRIBUTION OF RAINFALL | AMOUNT OF RAINFALL | DISTRICT |
| 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. |