RBSE Solutions for Class 7 Social Science Chapter 1 Biosphere and Landscape are part of RBSE Solutions for Class 7 Social Science. Here we have given Rajasthan Board RBSE Class 7 Social Science Chapter 1 Biosphere and Landscape.
|Chapter Name||Biosphere and Landscape|
|Number of Questions Solved||36|
Rajasthan Board RBSE Class 7 Social Science Chapter 1 Biosphere and Landscape
Exercise from text book
Question 1. Choose the correct options :
(1). Which is not a natural landform of the following?
(2). Landform surrounded by water on three sides.
Question 2. Fill in the Blanks :
(1) The four oceans on earth are
(2) Gaddi, Bakarwal and Bhotlya tribes of Himalayas reside there in ……… season.
(3) ……….. is the area where river flows along with its tributaries.
(4) A stream of water flowing naturally on land is called as ……….
(i). Pacific Ocean
(ii). Atlantic Ocean
(iii). Indian Ocean
(iv). Arctic Ocean
3. River Basin
What is biosphere? Why it is found only on earth?
Biosphere is that part on earth where life is present. Biosphere is found only on earth for these reasons :
- The sun continuously provides energy to earth.
- Abundant amount of water is found on earth.
- This part of earth has a good combination of the three forms (solid, liQuestion uid and gas) of matter.
Write difference between ecosystem and environment by defining them.
Ecosystem : All organisms influence one another and along with this, they influence the environment and get influenced by it. By this, a complex system of relationship is created between the organism and its environment. This mutual inter-relationship of biological and non-biological environmental factors is called ecosystem. In other words ecosystem is created, by the inter-relationship of biological and non-biological factors.
Environment : The word environment is derived from the French word environ (which means surrounding). Everything surrounds us is called environment, which consists of both biological and non-biological materials. Difference : Ecosystem describes the inter-relationship between biological and non-biological factors of the environment while the environment deals with biological and non-biological factors separately.
What is food chain? Explain with example?
Food chain : The Sun is the main source of energy for terrestrial animals and plants. Plants make food by taking energy from the sun. This energy which is stored in the plants is transferred from one being to another creating a chain.The transfer of energy through food is called food chain.
Example : Plants make their food from the energy from the sun, they derive the reQuestion uired nutritious minerals from the earth, from the plants, the insects obtain their food, insects become food for rats, rats further become food for snakes, and snakes are eaten by eagles, after the death of eagle, the decomposing bacteria decompose the dead eagle into the soil, this is how food completes its cycle.
What should we do to maintain the balance in the environment?
The balance of ecosystem is getting disturbed due to expansion of industrialisation and increasing population due to which it has become necessary to maintain the balance of the ecosystem for which the most important points are :
(i) Development should be done in such a way that it does not harm the ecosystem.
(ii) The environmental resources should be used judiciously in the development works. Such a balance should be created so that the development cycle should go on continuously and without effecting the environment. Collaborative point of view and not exploitative point of view should be adopted.
What is Island? Are they found only in sea?
Answer: That land which is completely surrounded by water on all the sides, is called an island. It is not compulsory that islands are always found in seas, they can exist in rivers, lakes or oceAnswer: Andaman and Nicobar islands and Lakshdweep are some important islands found in Indian Ocean. The Majuli Island on the river Brahmputra is the largest river in island in the world.
How many types of plains are there? Explain their main importance with example.
The flat surface of the earth is called plains. The height of such place from sea level is on an average less than 300 mts. These are created by soil deposit from rivers. On the earth’s surface plains cover approx 50% of the total area. There are mainly two types of plains :
- Coastal plains
- Internal plains.
(i) Coastal plains : These are found near seas and are mainly created by sea waves. They are less wide and these are good for constructing sea ports. Such as Konkan and Malabar in India. People visit these places for entertainment and they are often used for pisciculture.
(ii) Internal plains : The plains created by deposition of fertile soil by rivers on the main land are called internal plains. Such as the plains of Ganga and Brahmputra in India . Due to high fertility of the soil, these plains are important for agriculture and because they are flat, transportation is made easy through roads and railways. Since the availability of basic necessities for living is easy, the population density is high.
Activities from textbook
Let’s Do It (Page 9)
Try to find out which landform is present in your village/city. Make a picture of near by land form.
The landforms of our village is extensive plains. It is flat area and it is approximately
300 m above sea level. The land is fertile and it is an agriculture area.
List plants and animals of your nearby biosphere.
The list of plants and animals found in the nearby biosphere around us is mentioned below:
- Plants/trees : Neem, Pipal, Babool, Mango, Shisham etc. and bushes.
- Creatures : Cow, bull, horse, camel, sheep, goat, dog, monkey, cat, snake, mouse, crow, birds, fish, etc.
Look and write names of following land form. Also write its uses and discuss in class.
The names of above images are as follows: Image
(i) : Island
(ii) : River basin
(iii) : Plains
(iv) : Plateau
(v): Coastal plains
(i) Island : Land which is surrounded by water from all sides is called an island. It can be located anywhere-in rivers, lakes, sea or oceAnswer: In general, islands are tourist places and due to being small in size most of them have less population.
(ii) River Basin : That place or surface area where the main river and its tributaries flow is called the river basin. The rivers provide with us perennial water for agriculture.
(iii) Plains : The plains are the most densely populated parts of the earth’s surface. The plains are very fertilelands created by rivers where along with agriculture, trade, industries and transportation have a widespread network.
(iv) Plateau : The land with low gradient and which is flat on the top is called plateau. The high plateaus serve, as—pastures and the low plateaus are used for agriculture. Some plateaus are also important source of minerals.
(v) Coastal plains : The land surrounding the sea is called coast. These coastal plains are used for fisheries, agriculture and tourism.
(vi) Mountain : Those parts which are approximately higher than 600 meters or more than their surrounding areas are called mountains. The mountains are colder than the plains. They play an important role for rainfall. Step farming is done on the slopes of the mountain. Mountain area is inhabited by wildlife and some tribes also live here.
Other important questions
(A) Multiple Choice Question uestions
Choose the correct options :
What is the primary source of energy on the earth?
(d) None of these
On which mountain ranges is Mount Everest located?
What is the main occupation of people living in mountains?
(d) Animal husbandry
(d) Animal husbandry
Most of the mineral deposits are found in:
(d) Coastal areas
The naturally flowing single stream of water is called.
(d) All of these
On which river is the Majuli island situated?
(B) Fill in the Blanks :
The entire area of earth where life exists is called ……….
The hard surface of earth is called …………..
We find plants make their food from ………….
The height of Mt. Everest is ………….
4. 8848 meters.
(C) Very Short Answer Type Questions
When did the biosphere develop on earth?
Biosphere developed on the earth millions of years ago.
What is food chain?
On the various levels of the biosphere there is systematic arrangement of food/energy transfer which is called food chain.
Describe the various landforms on the earth.
Various land forms on the earth are as follows :
(iv) River basins
(v) Coastal plains
Name the highest peak on the earth?
Mount Everest-8848 meters, which is situated in the Himalayan mountain ranges.
What are mountain range?
When mountains lie in one or more than one (parallel) on a straight seQuestion uence they are called mountain range.
What are rain shadow areas?
The leeward side of mountain remains deprived of rains due to which they are called rain shadow areas.
Those low gradient areas which are high and broad and are flat on top are called plateaus. Deccan plateau, Chhota Nagpur plateau are example of plateaus in India.
What do you mean by river basin?
The plain where the main river and its tributaries flow is called river basin.
What do you mean by tributaries?
Like the branches of trees, rivers also have many branches of small rivers which come together to form the main river. These small rivers are called tributaries.
(D) Short Answer Type Questions
Mention three main characteristics of Biosphere.
Three main characteristics of biosphere are as follows :
- Availability of water in large amount.
- The earth receives continuous energy from the sun.
- This area of the earth has good combination of the three forms of matter (solid, liquid and gas).
Classify the organisms of biosphere.
The organisms of biosphere can be classified into two categories :
(i) Plant-kingdon : Which comprises of all plants, trees, shrubs and grasses.
(ii) Animal kingdom : Which includes humans, all organisms living in water on land and in air.
Describe the inter-relationship between man and environment.
The earth has lot of diversity in it, similarly the climate also varies from eQuestion uator to poles. These all geographical diversities indicate the environmental diversities. Due to these geographical diversities, various birds and animals and flora have evolved on the earth. It is clear that the environment influences the plants and animals and vice versa.
Today humans have brought-both relative and absolute changes in the environment. These change may be right or wrong. We are irrigating desert for agriculture and on the other side we are cutting forests. In reality every living organism is important for maintaining environmental balance. Every organism found on the earth is important. So every organism should be protected.
Explain the causes of environment imbalance in the present.
To fulfil his ever increasing needs and for economic development, man is exploiting nature intensively which is causing environment imbalance.
Main causes are given below :
- Destruction of flora and fauna.
- Replacing indigenous living plants and organisms with foreign plants and animals.
- Change in the components of the ecosystem for development.
- Extensive use of pesticides and insecticides.
- Change in the ratio of gases in the environment.
- Environmental pollution, etc.
Describe the types of rivers according to the availability of water.
The naturally flowing single stream of water on the surface of earth is called river. Rivers always follow the slope. Rivers usually originate from high mountain areas. Those rivers which have their origin on very high mountains, get water from rainfall as well as from the melting snow. These rivers continuously flow all the year round and are called perennial rivers, such as the Ganga and the Yamuna. Some rivers flow only in the rainy season. These are called seasonal rivers. The Luni river in Rajasthan is an example of seasonal river.
(E) Long Answer Type Question uestions
Describe the utility of oceans.
Oceans are spread on 3/4th part of the earth’s surface. Mainly there are four Oceans on the earth,
- Pacific Ocean
- Atlantic Ocean
- Indian Ocean and
- Arctic Ocean.
Their utility is mentioned below :
- Oceans have a lot of living organisms, mainly fishes.
- Fishes from the ocean are the main source of food.
- Oceans are a large deposit of minerals.
- The coastal areas of the ocean have a lot of possibility of petroleum reserves.
- Oceans are cheapest mode of transportation. Import and export through oceanic routes is the cheapest.
- Similar to lithosphere, the oceans also have mountains, plateaus, plains and gorges.
What do you understand by mountain? Describe its characteristics.
That area of the earth surface which is 600 meters or more higher than its surrounding area and extends to thousand kilometers in length is called mountain.
Special Characteristics of Mountain :
- Mountains are broad at the bottom and become narrow at top.
- The summit of the mountain has a steep gradient.
- The mountainous areas are cooler their the nearby areas as temperature falls with height.
- The water-laden air cause heavy rainfall after colliding with the mountains. The wind ward side gets ample amount of rainfall while the leeward side gets very little rainfall : This area is also called rainshadow area.
- Animal rearing is the main occupation of these areas. Agriculture is relatively lower than the plains.
- A lot of tribes live in the mountains. Gaddi, Bakarwal and Bhotiyas live in the Himalayas.
- Mountains provide shelter to various animals.
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