CBSE Class 10 Biology Our Environment Management Of Natural Resources Worksheet Set B

Read and download free pdf of CBSE Class 10 Biology Our Environment Management Of Natural Resources Worksheet Set B. Students and teachers of Class 10 Biology can get free printable Worksheets for Class 10 Biology in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 10 students should practice questions and answers given here for Biology in Grade 10 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 10 Biology Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests

Our Environment Management Of Natural Resources Class 10 Biology Worksheet Pdf

Class 10 Biology students should refer to the following printable worksheet in Pdf for Our Environment Management Of Natural Resources in standard 10. This test paper with questions and answers for Grade 10 Biology will be very useful for exams and help you to score good marks

Class 10 Biology Worksheet for Our Environment Management Of Natural Resources

 

Question : Accumulation of non- biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as:
(a) Eutrophication
(b) Pollution
(c) Biomagnification
(d) Accumulation
Answer :  C

Question : A food chain always starts with: 
(a) Respiration
(b) Decomposition
(c) Photosynthesis
(d) Nitrogen fixation
Answer : C
Explanation: A food chain in an ecosystem always starts with photosynthesis.
The autotrophs or the producers are at the first trophic level. They fix up the solar energy and make it available for heterotrophs or the consumers.
 
Question : In a given food chain, suppose the amount of energy available at the third trophic level is 50 KJ. What will be the energy available at the producer level? 
(a) 5000 KJ
(b) 50 KJ
(c) 5 KJ
(d) 500 KJ
Answer : A
Explanation: According to 10% law, the energy available to each successive trophic level is 10% of the previous trophic level.
Given, energy available at the third trophic level = 50 KJ
Energy available at second trophic level = 50 KJ x 10 = 500 KJ
Therefore, energy available at the producer level (first trophic level) = 500 KJ x 10 = 5000 KJ
 
Question : Vultures in an ecosystem are
(a) predators (b) scavengers (c) consumers (d) top carnivores
Answer :  B
 
Question : In which of the following trophic levels in any ecosystem the maximum energy is stored ?
(a) Producers (b) Herbivores (c) Carnivores (d) Top carnivores
Answer :  A
 

Very Short Answers


Question : Name the radiations absorbed by ozone layer. Give any one cause of the depletion of the ozone layer. Name a disease likely to be caused due to depletion. 
Answer : Ozone layer absorbs the harmful ultraviolet radiations from sun.
One cause of the depletion of the ozone layer is the use of Chlorofluorocarbons (CFCs) in various objects such as refrigerators. Ozone layer depletion may lead to skin cancer in human beings.


Question : Write the mode of nutrition in fungi.
Answer :  Saprophytic mode.


Question : What is the physical environment of an ecosystem called? Give one example.
Answer :  Physical environment of an ecosystem is called the abiotic or non-living component of an ecosystem. This includes factors like air, water. Temperature etc.


Question : What is ozone? Name the chemicals that damage the ozone layer. 
Answer :  Ozone is a molecule formed by three atoms of oxygen.
Synthetic chemicals such as chlorofluoro- carbons (CFC) and aerosols are the chemicals that damage the ozone layer in the atmosphere.


Question : What are two main components of ecosystem?
Answer : An ecosystem has two types of components, biotic component and abiotic component. 


Question : Explain the flow of energy between various components of the environment.
Answer :  
(i) Green plants in a terrestrial ecosystem capture about 1% of the energy of sunlight that falls on their leaves.
(ii) The loss of energy at each step is so great that very little usable energy remains after four trophic levels.
(iii) In a food chain, the greatest number of individuals are at lower trophic level of an ecosystem, the greatest number is of the producers.


Short Answers


Question :  mention three harmful effects of using polythene bags on the environment. Suggest an effective alternative to these bags.
Answer :  Harmful effects of using polythene bags on the environment are listed below:
(1) Plastic causes land pollution and water pollution as it is a non-biodegradable substance.
(2) Burning of plastic releases toxic gases and causes air pollution.
(3) Plastic bags cause harm to the life of animals when they consume it along with food.
(4) Plastic bags can cause blocking in sewage line.
(5) The surfaces of tiny fragments of plastic may carry disease-causing organisms and act as a vector for diseases in the environment.

Question :  Give any two ways in which biodegradable substances would affect the environment. 
Answer : Accumulation of biodegradable waste leads to the following problems.
a. They will serve as breeding ground for flies and mosquitoes which are carriers of disease like cholera, malaria etc.
b. Open decomposition of biodegradable waste produces mehane gas which is a green house gas & has a foul smell, thus causing air pollution. 
 

Question : List four problems caused by non-biode- gradable wastes. 
Answer :  Lot of Problems are caused by non- biodegrad- able wastes. Four Problems are as follow:
(1) Soil Pollution
(2) Water Pollution
(3) Ecological imbalance
(4) Biomagnification

Question : What are the by-products of fertilizer industries? How do they affect the environment?
Answer :  The harmful by-products are gases such as SO2 and NO. They cause extensive air pollution and are responsible for acid rain. The harmful by-products of the fertilizer industries are:
(1) Gases - SO2, NO, CO, CO2, and H2S.
(2) Solids - Pyrite ashes, calcium carbonate, sand and plastic bag. Effect on environment: The majority of the gaseous by-products like carbon dioxide, and methane are green house gases which contribute to global warming. The rest of the gases like sulphur dioxide and nitrous oxide are air pollutants and lead to acid rain. These gaseous by-products cause breathing and respiratory problems. The solid waste and waste water discharges into the water body. When these wastes are discharged into the water body, they increase the nutrient content of the water and cause algal bloom (increase in the number of algae). Due to algal bloom, algae form a layer on the surface of the water and hence, the oxygen does not reach the water body. Thus affecting the aquatic life. Also, these wastes are non-biodegradable, so they get accumulated at each trophic level by entering the food chain at the producer level and in the process of the transfer of food through food chains, these harmful chemicals such as pesticides , industrial effluents, heavy metals and radioactive substances get concentrated at each trophic level. This is called bio- magnification.

Question : List two causes of depletion of ozone layer. Mention any two harmful effects of depletion of this layer.
Answer :  Two causes of depletion of ozone layer are as follows:
(a) Use of CFCs
(b) Use of Halons
Harmful effects of ozone depletion:
(i) Due to depletion of ozone UV radiation reaches the earth. This UV radiation causes skin cancer, damage to eyes and immune system.
(ii) Ozone depletion may also lead to variation in global rainfall, ecological disturbances and dwindling of global food supplies.

Question : State any three ways of effective Garbage disposal so that pollution caused by it can be minimized.
Answer :  Pollution caused by garbage can be controlled by
(a) Recycling of certain wastes products like plastic and paper.
(b) Maximizing the use of biodegradable products like that of paper, cloth bags etc.
(c) Producing biogas from the organic wastes.
(d) Separation of biodegradable and non-bio-degradable waste during disposal.
(e) Making the compost of biodegradable wastes by decomposing them under the layers of soil. 

 

Long Answers


Question : What are the two main components of an ecosystem? Describe the physical factors which affect the distribution of organisms in different habitats.
Answer :  Abiotic (physical) and biotic components are the two main components of an ecosystem.
Abiotic components or physical environment.
i. Temperature. The physiological and behavioral adaptations of most animals depend upon the changes in the environmental temperature. The rates of photosynthesis and respiration in plants also fluctuate depending upon the change in temperature.
ii. Water. The extent to which an organism is dependant on an abundant water supply depends on its requirements and its ability to conserve it in adverse conditions. Organisms living in dry habitats generally have good water conservation such as in cacti, camels.
iii. Light. This is essential for all green plants and photosynthetic bacteria, and for all the animals dependant on the plants.
iv. Humidity. This is important because it can affect the rate at which water evaporates from the surface of an organism, which in turn influence its ability to withstand drought.
v. Wind and air currents. This particularly applies to plants. Only plants with strong root systems and tough stems can live in exposed places where winds are fierce. Wind is also instrumental in the dispersal of spores and seeds.
vi. pH. This influences the distribution of plants in soil and fresh water ponds. Some plants thrive in acidic conditions others in neutral or alkaline conditions. Most are highly sensitive to changes in pH.
vii. Soil nutrients. These particularly affect the distribution of plants in the soil.
viii. Water currents. Particularly in rivers and streams. Only organisms capable of swimming or avoiding strong currents can survive.
ix. Topography. Minor topographical differences may be just as important in influencing the distribution of organisms as wide geographical separation.
x. Background. The distribution of organisms whose shape or colouration are such that they are camouflaged when viewed against a particular background is related to the general texture and pattern of the environment. 

 

Question : Producers are autotrophs. They manufacture organic food from inorganic raw material. For this they pick up energy from sun and raw materials from the environment. Solar energy is absorbed by chlorophyll and changed into chemical energy. The chemical energy is stored in organic food formed by photosynthesis. Photosynthesis is performed by plants, algae, phytoplankton, blue green algae and some bacteria. Producers are also called transducers or converts as they change solar energy to chemical energy. Food manufactured by producers is used by all organisms including themselves. Producers have also a global impact of keeping the balance of CO2—→ Oconstant. They absorb CO2 and release O2.
(a) Why are photoautotrophs called producers?
(b) Why are environmentalist stressing for growing more trees?
(c) What is the source of energy in the biosphere?
(d) Why are heterotrophs called consumers?
Answer :  (a) Photoautotrophs are chlorophyll containing organisms which manufacture organic food that is made available to all other organisms.
(b) Plantation of more trees will reduce the rising concentration of CO2 being produced because of higher combustion of fossil fuels.
(c) Sunlight
(d) Heterotrophs are organisms which obtain readymade food from outside sources. They are therefore called Consumers.

Question : Good quantity of ozone occurs in upper atmosphere or stratosphere at a height of 11-16 Km over poles reaching 23-25 km above equator. This region is called ozone layer or Ozonosphere. It is highly protective to life on earth as it destroys very harmful short waves ultraviolet radiations of 100-320 nm wavelength. Longer wave ultraviolet radiations (320-390 nm) are allowed to pass through and reach the earth. It was found in 1980s that thickness of ozone layer is decreasing rapidly. On searching for the reason, it was noted that certain man-made chemicals like chlorofluorocarbons and halons are bringing about destruction of ozone. They are called ozone depleting substances (ODS). With great international efforts starting from Montreal Protocol (1987) to Kigali conference (2016), it was decided to eliminate the use of ODS and replace them with safer chemicals.
(a) Where is ozone found in plenty in the atmosphere?
(b) What is the function of stratospheric ozone?
(c) Name an ozone depleting substance?
(d) Name an international effort to check damage to ozone layer.
Answer :  (a) Ozonosphere/Ozone layer in upper atmosphere.
(b) Ozone destroys harmful ultraviolet radiations so that they do not reach the earth.
(c) chlorofluorocarbons
(d) Montreal Protocol (1987) for limiting chlorofluorocarbons production level. 



TOPIC- Our environment Management of natural resources

Question : If you could use any sources of energy for heating your food, Which one would you use and why?

Question : Why are we looking at alternate sources of energy?

Question : Give any two ways in which biodegradable substances would affect the environment?

Question : Give any two ways in which non biodegradable substances would affect the environment?

Question : Why are there more herbivores than carnivores?

Question : Why are some substances biodegradable and some non biodegradable?

Question : State how mining activity can harm the environment?

Question : Prior to the arrival of the British, state how the local people managed forests and water resources in India?

Question : Mention the role of the Bishnoi community in Rajasthan in the management of forests?

Question : How construction of tourist spots has proved harmful for natural resources?

  

 

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