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
CBSE Class 10 Biology Worksheet - Our environment Management of natural resources - Practice worksheets for CBSE students. Prepared by teachers of the best CBSE schools in India.
SUBJECT - BIOLOGY CLASS- X
ASSIGHNMENT NO 6
Question. mention three harmful effects of using polythene bags on the environment. Suggest an effective alternative to these bags.
Ans. 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. What is ozone? Name the chemicals that damage the ozone layer.
Ans. 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. List four problems caused by non-biode- gradable wastes.
Ans. Lot of Problems are caused by non- biodegrad- able wastes. Four Problems are as follow:
(1) Soil Pollution
(2) Water Pollution
(3) Ecological imbalance
Question. What are the by-products of fertilizer industries? How do they affect the environment?
Ans. 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.
TOPIC- Our environment Management of natural resources
1 If you could use any sources of energy for heating your food, Which one would you use and why?
2 Why are we looking at alternate sources of energy?
3 Give any two ways in which biodegradable substances would affect the environment?
4 Give any two ways in which non biodegradable substances would affect the environment?
5 Why are there more herbivores than carnivores?
6 Why are some substances biodegradable and some non biodegradable?
7 State how mining activity can harm the environment?
8 Prior to the arrival of the British, state how the local people managed forests and water resources in India?
9 Mention the role of the Bishnoi community in Rajasthan in the management of forests?
10 How construction of tourist spots has proved harmful for natural resources?
More Important Questions For Our Environment
Question. List two causes of depletion of ozone layer. Mention any two harmful effects of depletion of this layer.
Ans. 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. Write the mode of nutrition in fungi.
Ans. Saprophytic mode.
Question. Accumulation of non- biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as:
Ans. (c) Biomagnification
Question. What is the physical environment of an ecosystem called? Give one example.
Ans. 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. Explain the flow of energy between various components of the environment.
Ans. (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.
Case Study Based Questions
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—→ O2 constant. 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?
Ans. (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.
(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.
Ans. (a) Ozonosphere/Ozone layer in upper atmosphere.
(b) Ozone destroys harmful ultraviolet radiations so that they do not reach the earth.
(d) Montreal Protocol (1987) for limiting chlorofluorocarbons production level.
Students must free download and practice these worksheets to gain more marks in exams. CBSE Class 10 Biology Worksheet - Our environment Management of natural resources
Click for more Biology Study Material ›