Students can Download Science Chapter 1 Natural Resources Questions and Answers, Notes Pdf, KSEEB Solutions for Class 8 Science helps you to revise the complete Karnataka State Board Syllabus and to clear all their doubts, score well in final exams.
Karnataka State Syllabus Class 8 Science Chapter 1 Natural Resources
Class 8 Science Natural Resources Textbook Exercise Questions and Answers
I. Four alternatives are given to each of the following incomplete statements questions. Choose the right answer.
Question 1.
One of the following does not belong to the group.
(a) Water
(b) forests
(c) petrol
(d) soil
Answer:
(c) petrol
Question 2.
Government has banned hunting of wild animals. This helps to
(a) maintain biodiversity
(b) promote tourism
(c) provide food to animals
(d) maintain soil fertility
Answer:
(a) maintain biodiversity
II. Fill in the blanks with suitable words:
Question:
1. Resources that get replenished in nature are called …………………..
2. Petrol and kerosene are ………………….. forms of natural resources.
3. If there is a rise in water table, soil becomes …………………..
4. Soil provides ………………….. and ………………….. to terrestrial plants.
5. An example for renewable resource is …………………..
Answer:
1. renewable natural resources
2. non-renewable
3. saline
4. minerals and water
5. solar energy
III. Answer the following:
Question 1.
What are the natural resources?
Answer:
The things that occur in nature and that are useful to us are called natural resources.
Question 2.
Differentiate between renewable and non-renewable resources.
Answer:
Renewable resources
- Gan get replaced in nature easily.
- Some are continuously available and some can be replenished to maintain the flow eg. Solar energy, Forest.
Non-renewable resources
- Cannot be replenished, once depleted.
- Formed on earth over a long period of time one billions of years. Eg. Fossil fuels and minerals.
Question 3.
List the uses of water.
Answer:
The uses of water are as follows:
- It is very much essential for the existence of life.
- It is a factor for many aspects of life such as environmental stability, biodiversity conservation, fuel security and even health care.
- It is used for various human activities like drinking, bathing, washing and recreation.
- The largest use of water occurs in the agricultural sector.
- It is also used for heat exchange processes, industries and fire extinguishers.
- It is used for producing electricity by hydro electro power plants from Earth’s crust.
Question 4.
What is mining?
Answer:
Mining is a process of extraction and processing of minerals from Earth’s crust.
Question 5.
What happens if too much fossil fuel is used?
Answer:
Fossil fuels are non-renewable resources Therefore, they cannot be replenished once depleted. Hence too much of the usage of fossil fuels leads to energy crises in the future.
Question 6.
A student argues that a nation will be rich if its forests are conserved. Justify.
Answer:
- Forests provide raw materials for various wood-based industries such as paper, board, rayon etc.
- Forests provide timber which is an important material in constructing buildings and furniture.
- They provide many products like resins, gums, dyes, lace, fibres, wax, honey, medicines, etc.
- Forests have an aesthetic valve and provide opportunities in tourism. Thus the forest plays an important role in the country’s economy.
IV. Match the following:
A – B
1. High carbon content – (a) lignite
2. Renewable – (b) bituminous
3. Low sulphur content – (c) wind
4. Formation of soil – (d) LPG, (e) weathering of rock, (f) anthracite, (g) natural gas
Answers.
1. f
2. c
3. g
4. e.
KSEEB Class 8 Science Natural Resources Additional Questions and Answers
I. Answer the following questions:
Question 1.
Water is a unique natural resource. Justify the statement.
Answer:
Water is a unique natural resource because it is very much essential for the existence of life. It is the most critical, limiting factor for many aspects of life such as environmental stability, biodiversity conservation, fuel security and even health care.
Question 2.
Water should be used judiciously. Give reason.
Answer:
Nearly 97% of the water on the earth is held in oceans and seas. About 2.4% is found in a glacier and polar ice caps. Only a very small percentage is. available for human use. Therefore water should be used judiciously
Question 3.
State some reasons for the depletion of water.
Answer:
The reasons for depletion of water are: Increase in population, Improper use of water, Pollution and Destruction of forests.
Question 4.
Mention the importance of soil.
Answer:
- Soil is a natural resource that provides minerals and water to all land plants,
- It is the primary nutrient base for agricultural crops.
- It is a habitat for a wide variety of organisms like earthworms, crabs, insects, and microorganisms.
Question 5.
How does desertification occur?
Answer:
Due to waterlogging and salination of soil, the fertility of soil diminishes and becomes barren and useless. This condition is called desertification.
Question 6.
What are the reasons for the extinction of many species?
Answer:
The reasons for the extinction of species are:
- Destruction of their natural habitats.
- Hunting, poaching, and capturing them for meat, skin, fur, ivory, horns, etc.
Question 7.
Write the measures for the conservation of living resources.
Answer:
The measures taken to conserve the living resources are:
- Proper maintenance of their natural habitats.
- Establishment of Sanctuaries and National Parks.
- Restriction of hunting poaching of animals, by strict legislation.
- Protection of sample populations in zoos and botanical gardens.
- Creation of seed banks, gene banks and similar genetic resource centres.
Question 8.
What are fossil fuels? How are they formed?
Answer:
Non-renewable resources such as coal, petroleum products, and natural gas represent fossil fuels. They are formed by the submerging of photosynthetic green plants which were existing millions of years ago.
Question 9.
Mention the types of coal and their Carbon content.
Answer:
The types of coal are
- Anthracite – Carbon content is about 80%
- Lignite – Carbon content is about 60% – 65%
- Bituminous coal – Carbon content is less than 40%
Question 10.
Name a few petroleum products.
Answer:
Petrol, diesel, kerosene, lubricating oils and Naptha represent the various forms of petroleum products.
Question 11.
Natural gas is considered as eco-friendly. Why?
Answer:
The low sulphur content of the Natural gas makes it the least pollutive source of fuel. Therefore it is considered as eco-friendly fuel.
Question 12.
What is a mineral?
Answer:
Minerals are the metallic compounds, naturally found in the Earth’s crust and not formed from living matter.
Question 13.
Minerals are also considered as non¬renewable resources. Why?
Answer:
Minerals are formed due to Earth’s geological processes over millions of Conservation of years. Hence, minerals-are also considered as non-renewable resources.
II. Fill in the blanks:
Questions:
- A unique natural resource is ___________
- World Water Day is celebrated ______________ every year.
- Punjab suffers from desertification caused by ______________
- The two main causes for desertification are ___________ and _____________
- The formation of soil occurs by a natural process called _____________ rocks.
- Forests maintain _________________
- The indicator of the natural wealth of a nation is ______________
- World Forest Day is observed all over one of every year _______________
- Two examples of non-renewable natural resources are ____________ and ____________
- The judicious use of natural resources is called _________________
- Excessive use of chemicals in agriculture leads to ________________
- The maximum use of water occurs in the _____________ sector.
Answer:
- Water
- March 22nd
- Excessive irrigation
- Waterlogging and salination
- Weathering
- Water cycle
- Forest
- March 21st
- Fossil fuel and mineral
- Conservation
- Pollution of soil and water
- Agricultural
III. Match the following:
1. Living resource – (a) air
2. Non-living resource – (b) forest
3. renewable resource – (c) solar energy
4. Non-renewable resource – (d) water
5. Inexhaustible resource – (e) land
6. Exhaustible resource – (f) mineral
Answer:
1. b
2. e
3. a
4. f
5. c
6. d
IV. Choose the correct option and fill in the blanks:
Question 1.
Water is a unique natural resource since it is
(a) depleting
(b) essential for the agricultural sector
(c) essential for the existence of life
(d) unequally distributed on-the earth.
Answer:
(c) essential for the existence of life
Question 2.
Collecting and storing water during the rainy season is called …………………
(a) conservation of water
(b) rainwater harvesting
(c) depletion of water
(d) waterlogging
Answer:
(b) rainwater harvesting
Question 3.
Topsoil is getting exposed due to
(a) overgrazing
(b) desertification
(c) salination
(d) weathering
Answer:
(a) overgrazing
Question 4.
The indicator of the natural wealth of a nation is
(a) water
(b) crops
(c) forest
(d) mineral
Answer:
(c) forest
Question 5.
The species which are facing a threat of extinction in the near future are I called as
(a) extinct species
(b) dangerous species
(c) conserved species
(d) protected species
Answer:
(b) dangerous species
Question 6.
Fossil fuels are called non-renewable species because
(a) the consumption rate of these fuels is in excess
(b) consumption rate cannot be reduced
(c) they are formed by submerged plants
(d) they cannot be replenished once depleted
Answer:
(d) they cannot be replenished once depleted