Extra Questions for Class 9th: Ch 3 Drainage Social Studies (S.St) Important Questions Answer Included

Very Short Answer Questions (VSAQs): 

1. At which place are Royal Bengal tigers found?


Sunderban delta

2. How many types of plant species are found in India?


About 47,000 approximately.

3. Why moist tropical deciduous forests are more prominent in the eastern and central parts of India?


These areas experience 100 to 200 cm of annual rainfall.

4. Which type of natural vegetation has originally come to India from abroad?


Exotic plants.

5. In which region the yak, shaggy-horned wild ox and the Tibetan antelope are found?



6. A very large ecosystem on land having distinct type of vegetation and wildlife is called.



Short Answer Questions (SAQs):

1. How do climatic factors influence the vegetation cover of India? Explain.


• The character and extent of vegetation are mainly determined by temperature, along with humidity in the air, precipitation and soil. The fall in the temperature affects the types of vegetation and its growth and changes it from tropical to subtropical, temperate and alpine vegetation. 
• The variation in duration of sunlight at different places is due to differences in latitude, altitude, season and duration of the day. Due to longer duration of sunlight, trees grow faster in summer. 
• Areas of heavy rainfall have more dense vegetation as compared to other areas of less rainfall. 

2. Describe natural vegetation and distinguish between flora and fauna.


(i) Natural vegetation refers to a plant community which has grown naturally without human aid and has been left undisturbed by humans for a long time.
• The term flora is used to denote plants of a particular region or period. All the flowering
and non-flowering plants from a tiny fungus to a creeper to a big tree is called flora.
• The species of animals are referred to as fauna. All the animal species staring from a tiny
bacteria to a big elephant is called fauna.

3. How are forests useful to human being?


Forests are renewable resources and play a major role in enhancing the quality of environment. They modify local climate, control soil erosion, regulate stream flow, support a variety of industries, provide livelihood for many communities and offer panoramic or scenic view for recreation. It controls wind force and temperature and causes rainfall. It provides humus to the soil and shelter to the wild life.

4. A great variety of flora is found in India. Give three geographical factors responsible for this diversification of flora. 


Factors responsible for huge diversity of Flora and Fauna:
• Land: Nature of land influences the type of vegetation. For example, land for agriculture and undulating land for forests.
• Soil: Different types of soils provide basis for different vegetation.
• Temperature: Vegetation differs from low temperature to high temperature.

5. Why has India’s natural vegetation undergone many changes in the recent past? Explain. 


• For the development of industries, more transportation and raw materials needed for which forests are cut down.
• Growing demand for cultivation requires more land for which forests are cleared.
• Increasing urbanisation and overgrazing of pastures.

6. Explain any three major threats to the rich biodiversity of India.


The rich biodiversity of India is threatened by:
(i) Hunting by greedy hunters.
(ii) Pollution due to chemical and industrial wastes.
(iii) Reckless cutting of forests for cultivation, inhabitation, railway expansion, etc.

Long Answer Questions (LAQs):

1. Why are forests important for human beings?


• Forests are renewable resources and play a major role in enhancing the quality of the environment.
• They modify the local climate and control soil erosion.
• They regulate the flow of streams and support a variety of industries like the rubber industry.
• Forests also provide a livelihood for many communities.
• They also offer panoramic or scenic view for recreation.
• They control the wind force and temperature and cause rainfall.
• They provide humus to the soil and shelter to wildlife.

2. Describe any five characteristics features of tropical rain forests of India.


• Tropical rain forests are restricted to heavy rainfall areas of India.
• They are at their best in areas having more than 200 cm of rainfall with a short dry season.
• The trees found in these forests reach great heights upto 60 metres or even above.
• Since the region is warm and wet throughout the year it has luxuriant vegetation of all kinds trees, shrubs and creepers giving it a multilayered structure.
• There is no definite time for trees to shed their leaves.
• As such, these forests appear green all the year round.
• Some of the commercially important trees of this forest are ebony, mahogany, rosewood, rubber and cinchona.
• The common animals found in these forests are elephant, monkey, lemur and deer.

2. Describe any five features of mountainous forests of India.


• In mountainous areas, the decrease in temperature with increasing altitude leads to a corresponding change in natural vegetation thus making a succession of natural vegetation belts.
• The wet temperate type of forests are found between a height of 1000 and 2000 metres.
• Evergreen broad leaf trees such as oaks and chestnuts predominate.
• Between 1500 and 3000 metres, temperate forests containing coniferous trees like pine, deodar, silver fir, spruce and cedar are found.
• These forests cover mostly the southern slopes of the Himalayas, places at high altitude in southern and North-east India.
• At higher elevations, temperate grasslands are common.
• At high altitudes, generally more than 3600 metres above sea level, temperate forests and grasslands give way to the Alpine vegetation.
• Silver fir, junipers, pines and birches are the common trees of these forests.
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