Our Environment: Class 10 Science Q&A
50 free answers on Our Environment (Science) for Class 10 students, across CBSE, ICSE and State boards. Includes questions such as “Explain some harmful effects of agricultural practices on the environment.”, “What are the by-products of fertiliser industries? How do they affect the environment?”, “Suggest suitable mechanism (s) for waste management in fertiliser industries.”
Question & Answer
Questions
- ScienceClass 10CBSE
Explain some harmful effects of agricultural practices on the environment.
Soln: Following are the harmful effects of agricultural practices on the environment Soil degradation Extensive cropping causes loss of soil fertility. Also, over the time it can lead to soil erosion and finally to desertification. Pollution Use of synthetic fertilisers and pesticides leads to soil, water and air pollution. • Water shortage Excess use of ground wate
- ScienceClass 10CBSE
1. What are the by-products of fertiliser industries? How do they affect the environment?
Soln: The most common byproduct of fertilizer industries are oxides of nitrogen and sulphur. They pass into the atmosphere and spread to all nearby places. The gases have a corrosive effect on several items besides being harmful to living beings. They also give rise to acid rain. Acid rain is highly destructive to forests, crops and aquatic biota. Oxides of Nitrogen and Sulphur are the most common by-product of fertilizer industries. These oxides pass into the
- ScienceClass 10CBSE
1. Suggest suitable mechanism (s) for waste management in fertiliser industries.
Soln: To manage waste in fgertiliser industry following steps to be taken. For control of gaseous pollutants combustion equipments are used which can be oxidised. The pollutants are exposed to a high temperature in the process. Air pollutants, such as certain gases and vapour and inflammable compounds are controlled through the use' of adsorption equipments. Adsorption is a surface phenomenon and it needs the presence of a large solid surface Toxic and
- ScienceClass 10CBSE
1. Name the wastes which are generated in your house daily. What measures would you take for their disposal?
Soln: Wastes generated in our house daily are as follows Kitchen wastes Paper wastes like newspapers, bags, envelopes Plastic bags Vegetable/fruit peels/rind Measures for disposal Measures to take to dispose house waste are Segregation of biodegradable and non-biodegradable Safe disposal of plastic Vegetable/fruit peels can be placed near trees/plants, which on decomposition will e
- ScienceClass 10CBSE
1. Give two differences between food chain and food web.
Soln: Food Chain Food web The food chain is the straight and single pathway for the flow of energy in an ecosystem, through different species of organisms. Food web is defined as the convoluted or complicated pathway of an ecosystem consist of numerous food chains of the different tr
- ScienceClass 10CBSE
Suggest any four activities in daily life which are eco-friendly
Soln: Activities in daily life which are eco-friendly are as follows Using of bicycles and electrical bikes instead of vehicles run by fossil Avoid using plastic bas, instead we can use bags made of clothes and Plant trees in our surroundings Stop usage of old items and recycle
- ScienceClass 10CBSE
1. What are decomposers? What will be the consequence of their absence in an ecosystem?
Microorganisms, comprising bacteria and fungi, break-down the dead remains and waste products of organisms. These microorganisms are the decomposers as they break-down the complex organic substances into simple inorganic substances that go into the soil and are used up once more by the plants. If decomposers are absent in the ecosystem recycling of material in the biosphere will not take place which would lead to accumulation of dead plants and animals in the environment. Additionally
- ScienceClass 10CBSE
1. We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?
Soln: An aquarium is an artificial ecosystem which is incomplete ecosystem when compared to pond or lake which is natural and complete ecosystem.
- ScienceClass 10CBSE
1. Select the mis-matched pair in the following and correct it. (a) Biomagnification — Accumulation of chemicals at the successive trophic levels of a food chain (b) Ecosystem — Biotic components of environment (c) Aquarium — A man-made ecosystem Parasites — Organisms which obtain food from other living organisms
Soln: Biomagnification — Accumulation of chemicals at the successive trophic levels of a food chain Ecosystem — Biotic components of environment Aquarium — A man-made ecosystem Parasites — Organisms which obtain food from other living organisms Soln: Answer is (b) Ecosystem — Biotic components of environm
- ScienceClass 10CBSE
1. Explain the role of decomposers in the environment?
Soln: Decomposers breakdown dead and decaying living matter and helps in the nutrient recycling. This will clean the environment by removing dead material.
- ScienceClass 10CBSE
1. If a grass hopper is eaten by a frog, then the energy transfer will be from (a) producer to decomposer (b) producer to primary consumer (c) primary consumer to secondary consumer secondary consumer to primary consumer
Soln: Answer is (c) primary consumer to secondary consumer Explanation: Grass hopper is a primary consumer because it feed on grass. If grasshopper is getting eaten by frog. Frog will be secondary consumer.
- ScienceClass 10CBSE
1. Suggest one word for each of the following statements/ definitions (a) The physical and biological world where we live in (b) Each level of food chain where transfer of energy takes place (c) The physical factors like temperature, rainfall, wind and soil of an ecosystem Organisms which depend on the producers either directly or indirectly for food
Soln: Environment Trophic level Abiotic factors Consumers or heterotrophs
- ScienceClass 10CBSE
1. Differentiate between biodegradable and non-biodegradable substances. Cite examples.
Soln: Substances which can be broken into pieces by biological process are known as biodegradable substance. Substances which cannot be broken into pieces by biological process are known as non-biodegradable substance.
- ScienceClass 10CBSE
1. Why are crop fields known as artificial ecosystems?
Soln: Crops field are known as artificial ecosystems because they are manmade where certain biotic and abiotic components are manipulated.
- ScienceClass 10CBSE
1. What are the advantages of cloth bags over plastic bags during shopping?
Soln: Advantages of cloth bags over plastic bags during shopping are as follows They can carry more weight than plastic bags They are bio-degradable They can be reused. They donot cause environment pollution.
- ScienceClass 10CBSE
1. Why is improper disposal of waste a curse to environment?
Soln: Wastes pollute our environment, air, soil and water, and cause harmful effects on all living organisms.
- ScienceClass 10CBSE
1. Disposable plastic plates should not be used because (a) they are made of materials with light weight (b) they are made of toxic materials (c) they are made of biodegradable materials they are made of non-biodegradable materials
Soln: Answer is (d) they are made of non-biodegradable materials Explanation: Plastics are non-biodegradable hence they start accumulating in nature harming living organisms.
- ScienceClass 10CBSE
1. The decomposers in an ecosystem (a) convert inorganic material, to simpler forms (b) convert organic material to inorganic forms (c) convert inorganic materials into organic compounds do not breakdown organic compounds
Soln: Answer is (b) convert organic material to inorganic forms
- ScienceClass 10CBSE
1. What will happen if deer is missing in the food chain given below? Grass → Deer → Tiger (a) The population of tiger increases (b) The population of grass decreases (c) Tiger will start eating grass The population of tiger decreases and the population of grass increases
Soln: Answer is (d) The population of tiger decreases and the population of grass increases. Explanation: Lack of predators will increase population of grass. Population of tiger will reduce due to lack of food.
- ScienceClass 10CBSE
1. The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about (a) 1 % (b) 5 % (c) 8 % (d) 10 %
Answer is (a) 1 % Explanation: Green plants utilize 1% of radiation absorbed by leaf and use it for photosynthesis.