DAV Class 8 SST Chapter 3 Question Answer Natural Resources Vegetation and Wildlife
DAV Class 8 SST Chapter 3 Natural Resources Vegetation and Wildlife Solutions
A. Tick the correct option.
1. Which term is used for the plant community which grows without human interference?
Answer: natural vegetation
2. Which vegetation grows in hot and humid regions of the world? Answer: Tropical Evergreen Forests
3. The most common trees of Tropical Deciduous Forests are-
Answer: Sal and teak
4. Trees of Mediterranean Forests are have-
Answer: spiny and waxy leaves
5. The area under forests is depleting due to
Answer: human interference
B. Fill in the blanks.
1. The assemblage of plant species in an environment is known as ___________.
2. ___________ and ___________ are two important factors for the plant growth.
3. Humus helps to maintain ___________ of the soil.
4. Hardwood trees have broad leaves to permit ___________ of surplus moisture.
5. Teak is the commercially important tree of the ___________ forests.
Answer: (1) natural vegetation (2) Temperature, rainfall (3) fertility (4) transpiration (5) Tropical Deciduous.
C. Write a technical term or an appropriate word for each of the following statements.1. The forests that do not shed all their leaves at the same time.
Answer: Tropical Evergreen Forests
2. In this forest, summers are dry and moderate rain falls in winter.
Answer: Mediterranean Forests
3. Conical shaped trees are common in these forests.
Answer: Temperate Softwood Forests
4. The act or process of creating new forests by planting saplings.
Answer: Afforestation
5. The Temperate Softwood Forests are found on the southern slopes of the Himalayas.
Answer: Mountain Forest
D. Answer the following questions in brief.
1. Why are the Tropical Rain Forests known as evergreen forests?
Answer: Tropical rainforests always appear green as their trees never shed their leaves at any time of the year. Therefore, they are called an evergreen forest.
2. Why do the Tropical Deciduous Forests shed their leaves during the summer season? Name two such trees.
Answer: The Tropical Deciduous Forests shed their leaves during the summer season to conserve moisture. e.g., Sal and Teak.3. Write any three characteristic features of the trees found in the Mediterranean Forests.
Answer: Three characteristic features of the trees found in the Mediterranean Forests are:
- The trees are widely scattered.
- The trees have long roots and thick bark.
- They have spiny, waxy, and leathery textured leaves.
4. Distinguish between a national park and a wildlife sanctuary.
Answer: National Park
- It is a well-defined area for the protection of wildlife.
- Collection of firewood, or timber from any part of the forest is totally prohibited.
- Visitors can only visit the park. No one has the right to use any forest product.
- Example: Grand Canyon National Park of USA.
Wildlife sanctuary:
- It is a declared protected area in which limited human activities are permitted.
- Hunting of animals and cutting of trees are banned.
- People can collect firewood, timber, and medicinal herbs in a moderate amount which can be used only for research purposes.
- Example: Manas Wildlife Sanctuary of India.
5. Suggest any three important measures for the protection of forests.
Answer: Three important measures for the protection of forests are:
- Afforestation.
- Large-scale cutting of forest trees must be stopped.
- Forests must be protected from insects and pests.
E. Answer the following questions.
1. What is meant by natural vegetation? How do temperature and rainfall affect its distribution? Explain with examples.
Answer: The assemblage of plant species in an environment is known as Natural vegetation.Example: In areas of heavy rainfall, the forests are thick and dense. As the rainfall decreases, the concentration of trees also reduces. Similarly in deserts where temperature remains high, Shrubs and short trees are found but in cold regions where temperature remains low, plants occur in patches in the form of mosses and lichens.
2. Highlight any five points of distinction between Tropical Deciduous Forests and Coniferous Forests.
Answer: Tropical Deciduous Forests:
- They shed their leaves during dry seasons.
- They have the types of trees which have hardwood.
- These forests receive 100-200 cm of summer rainfall.
- Another name for these forests is the monsoon forests.
- Important trees found are sal, teak, neem, and shisha.
Coniferous Forests:
- They retain their leaves throughout the year.
- The wood in coniferous forests is generally soft.
- These forests receive rain in the form of snow in winter.
- Coniferous forests are also known as Taiga.
- Dominant trees in coniferous forests are pines, spruces, and larches.
3. ‘Forests are essential for maintaining an ecological balance.’ Justify the statement with suitable arguments.
Answer: Forests are essential for maintaining an ecological balance:
- Forests provide a safe habitat for wild animals.
- Many people depend on forests for their livelihood.
- Forests help to prevent soil erosion.
- It helps to produce humus which is helpful to maintain the fertility of soil.
- It helps us to breathe by converting carbon dioxide into oxygen.
4. Explain the importance of wildlife.
Answer: The importance of wildlife are:
- Wildlife is very essential to maintain the ecological balance on the earth’s surface.
- Wildlife is important for its aesthetic values and ecological balance.
- The beauty of wildlife boosts tourism and creates jobs for the people.
- Animal’s behavior changes at times of natural disasters like tsunamis and earthquakes.
- Dead and decaying plants and animals also produce humus which is helpful to maintain the fertility of the soil.
5. How are human beings responsible for the depletion of vegetation and wildlife?
Answer: Human beings are responsible for the depletion of vegetation and wildlife in this way:
- Agricultural expansion.
- We cleared forests for the mining of minerals and soils.
- We used wood for paper, furniture, ships, etc.
- Large-scale development projects.
- Habitat destruction, hunting of animals, and over-exploitation of various products.
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