Balbharati Class 6 General Science Solutions Natural Resources Air Water and Land
Welcome to NCTB Solutions. Here with this post we are going to help 6th class students for the Solutions of Balbharati Class 6 General Science Book Chapter 1, Natural Resources Air, Water and Land. Here students can easily find step by step solutions of all the questions in Natural Resources Air, Water and Land. Also our Expert Science Teacher’s solved all the problems with easily understandable language with proper guidance so that all the students can understand easily. Here in this post students will get chapter 1 solutions. Here all the Question Answer are based on Balbharati latest syllabus. Here all the question and answer are based on Maharashtra State Board latest syllabus.
Natural Resources Air, Water and Land Exercise question Solutions :
Question no – (1)
(a) The layer of ozone gas absorbs Ultraviolet (UV) rays that come from the sun to the earth.
(b) Of the total water available on the earth, fresh water forms 0.3 percent.
(c) Both Biotic and Abiotic constituents are present in the soil.
Question no – (2)
(a) The ozone layer is a protective shell of the earth :
The ozone layer is a part of stratosphere. It is very important for living things to have this layer of ozone at a high altitude around the earth. The ultraviolet rays coming from the sun are very harmful for living things. The ozone gas absorbs these rays. As a result life on earth is protected. Therefore ozone layer is called protective shell of the earth.
(b) Water is life :
We need to drink water everyday so that all our bodily functions run smoothly. It is almost impossible for us to spend even a single day without water. No living things can survive without water. We all need water to live.
(c) Seawater is useful even though it is not potable :
Though seawater is not potable, but still it has several other usages. As for instance, ocean water can be used in order to make hydro electricity. There is requirement of seawater for nuclear power plants, in order to lessen the temperature of the reactors. It can also be used as an inexpensive means for transportation. Scuba diving and water sports are the various activities for which seawater can be used. In arid and semi-arid areas, seawater are also used in plant irrigation. So, these are the several reasons that depicts the usefulness of seawater.
Question no – (3)
(a) Microbes in the soil get destroyed :
Humus is the layer formed on soil due to the decomposition of dead plants and animals by microbes. If microbes in the soil get destroyed, it slow down the humus formation.
(b) The number of vehicles and factories in your surroundings increases :
If the number of vehicles and factories increases in our surroundings, then there will be an upsurge in the level of air pollution due to the emissions of smoke and harmful gases from factories and vehicles. The factories and vehicles constitutes the chief components of air pollution. If there are establishment of industries in our surroundings, then more and more trees would be demolished in order to make path for them, which will ultimately bring about negative impact to the environment.
(c) The total supply of potable water is finished :
If the total supply of potable water is finished then no living things can survive without water. We will not able to spend even a single day without water. We will not able to spend even a single day without water. We all need water to live.
Question no – (4)
(1) Carbon dioxide → (d) Combustion
(2) Oxygen → (c) Plants and food production
(3) Water vapour → (b) Rain
(4) Microbes → (a) Generation of soil
Question no – (5)
(a) Constituents of the biosphere
(b) Biotic constituents of soil
(c) Fossil fuel
(d) Inert gas in air
(e) Gases that are harmful to the ozone layer
(i) Carbon tetra chloride,
(ii) Chloro fluro carbons.
Question no – (6)
(a) Land and soil are the same thing.
= This statement is False.
= Reason : Land is natural resources. Soil on the land is formed by a natural process.
(b) The water in a lake is called ground water.
= This statement is False.
(c) It takes about 1000 years to form a 25 cm thick layer of soil.
= This statement is False
= Reason : It takes about a thousand years for a 2.5 cm thick layer of mature soil to form.
(d) Radon is used in decorative lights.
= This statement is False
= Reason : Neon is used in decorative lights.
Question no – (7)
(b) We cannot use all the water on earth because sea water is salty. Some water is in the frozen state. A very small quantity of water is available for drinking. Due to the uncontrolled use of water for an increasing population industry and farming it is now on short supply. Water scarcity has become a serious problem.
(c) The various constituents of air are as follows :
Nitrogen, Oxygen, Carbon-di-oxide, inert gases, water vapour and dust particles.
Their uses are :
Nitrogen : helps living things to build the necessary proteins. It is useful in the production of ammonia and in airtight packaging of foodstuffs.
Oxygen : necessary for respiration in living things and for combustion.
Carbon-di-oxide : Plants use it for producing their food. Used in fine extinguishers.
Inert gases : used in electric bulbs, decorative lights, street lighting fluorescents tube. Used for obtaining low temperature and also for generating lift in air ships and also used for flash photography.
(d) The air, water and land considered to be valuable natural resources because :
Air, water and land are the factors important for sustaining the living world on the earth and for fulfilling their basic needs. All things on the earth are associated with air, water and land. We use them to fulfill our requirements. Living things use land, water and air available on earth and so does man. The resources are sufficient for all living things.
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