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Collection of extra questions with answers which are very important for the examination point of view. Class 10 Science Chapter 15 Extra Questions contains combination of long and short questions with suitable explanation and answers. UP Board students also can use these questions for their exams preparation and school test.
UP Board high school students are now using NCERT Books for their course, so these questions will help him a lot for understanding the concepts of Chapter 15 our environment. For the convenience of students, questions are divided into sets of questions. Class 10 Science Chapter 15 Important Questions with answers are given below. Biodegradable: 1. They can be broken into simplest form by biological processes.
They do not produce more pollution. They remain for less time in environment. Non-biodegradable: 1. They cannot be broken by biological processes. They produce more pollution. They remain for a long time in the environment. Effect of biodegradable substance: i They release harmful gases like Methane. Effect of non-biodegradable substances: i They are very harmful for the various members of the ecosystem.
Spoilt food, vegetable peels, plastic, PUC used tea leaves, milk packets, empty cartons, used clothes, empty medicine bottles, bubble packs, broken footwear, etc. The various links in the food chain called are called trophic levels. They are the food habits of organism. An aquarium comprises green aquatic plants, fish and other aquatic animals. These biotic factors for the community. Water, sand, temperature, light, etc. There is a constant ecosystem exchange of material between living and non-living components.
Aquatic green plant is the producer of the aquarium. Animals are the consumers. The green plant gives out oxygen which taken up by the animals. Gives out carbon dioxide which plants utilise in photosynthesis. Animal excrete decomposed by the decomposer and the simple compounds produced are taken up by the plants. Thus an aquarium is self-perpetuating functional unit. Therefore, it is known as eco-system. An aquarium is a manmade ecosystem, so it is known as artificial eco-system. Main component is i Biotic components ii Abiotic components.
So it has to be cleaned once a while. Moreover, due to increase in nutrients there is enormous growth of algae which makes aquarium water turbid and deficient of oxygen. A producer is always a green plant. It synthesis its own its own food by trapping light energy. A consumer is an animal or a non-green plant which cannot synthesise its own food.
A consumer directly or indirectly obtains its food from producer. Natural replacement of the soil would not take place.
All the nutrition cycles have decomposers as their components. In their absence these nutrient cycles would not be completed.
There will be no recycling of matter between biotic and abiotic components of an ecosystem, because all the matter will remain locked up in the dead bodies.
Thus existence of life on this earth will become impossible. A natural eco-system is a balanced system because it consists of producer, herbivores, carnivores and decomposers. Organisms of an eco-system are well adjusted with the biotic component. In natural eco-system there is provision of constant flow Boat And Stream Questions Class 8 Month of energy through food chains and recycling of the nutrient through decomposers. Thus a natural eco-system is self-sufficient system.
The removal of phytoplankton from a pond eco-system will stop constant flow of energy disturbing the whole food web in the pond. First larvae and small fishes will die in want of food and ultimately fishes which feed on them will die. Question: What is an eco-system? Answer: Eco-system is the whole biotic community in a given area plus its abiotic environment physical factor like temperature, rainfall, wind, soil and mineral both interacting with each other and maintain a balance in nature.
Eco-system can be as large as a forest, or small as a pond and lake. This function system may be natural as forest or may be artificial example a crop field or an aquarium. Thus the eco-system has biotic and abiotic components.
It is not possible that the food chain has more than six tropic levels. In a food chain having more than six steps energy available to the top carnivore will not be sufficient for his survival.
The sun is the only source of energy which plant trap during photosynthesis and store as food. The energy in the form of heat goes utilised because plant cannot use this heat energy in the synthesis of food. Thus, there is always flow of energy from the sun into the biosphere. The energy enters the biosphere from the non-living component is released as heat.
So the energy flow in the biosphere is unidirectional. When any harmful chemical like DDT, BHC enters in a food chain the concentration of chemical increases as the trophic level is increased. This phenomenon is called biological magnification. These Chemicals get accumulated occupy the top trophic level so there is maximum at top trophic level. The tertiary consumers occupy the top trophic level so there is maximum concentration of the harmful chemicals and they are affected badly.
There is layer of ozone gas in the stratosphere. Ozone at higher level of the atmosphere in a product of UV radiation acting on oxygen molecules. The higher energy UV radiation split apart some molecular O2 into free oxygen O atoms. These atoms then combine with O2 to form O3. Due to the depletion of stratospheric ozone a seasonal hole in the ozone layer at polar regions is formed due to the vortex in the atmosphere.
This is known as the ozone hole. Areas of human habitation under Boat And Stream Questions Class 8 25 this hole are more vulnerable to the effect at UV rays from the sun. Depletion of the ozone layer could cause: i Temperature changes and rainfall failures on earth. CFCs are very harmful to ozone layer and cause depletion of ozone layer. Which allow harmful UV rays to enter in the earth atmosphere. Ozone depletion allows more UV radiations from the sun to reach us. This may directly harm our health: i Cancer in human being especially skin cancer, eye cancer.
During recycling it does not produce poisonous gases like plastic bags. Harmful effects: i Polythene bags when buried, soil render that area barren and leads to soil pollution.
Alternative to plastic bags: You can use cloth, jute and paper bags to carry your purchased items. Safe disposal: i Some of the non-biodegradable substance can be used for land refill. Excessive use of fossil fuel, even when we have to go nearby we use car, motor cycle, etc. Fossil fuels, on burning produce oxides of carbon, nitrogen and sulphur which cause air pollution. Paper is bio-degradable while plastic is not. Cause of depletion of ozone layer: i use of chlorofluorocarbon compounds.
Harmful effects of depletion of ozone layer: i UV rays reach the earth which cause skin cancer and sun burn. The demand of energy as increased it has led to utilization of non-renewable resources of energy at a faster rate.
Due to which an imbalance is created in our environment. It also led to pollution at a large scale. They decomposes dead remains of plants and animals Boat And Stream Questions Class 8 31 and their waste organic products into simple inorganic substance which are released into the atmosphere for reuse by the plants. Thus they help in recycling of materials. Some substances are biodegradable because there are specific enzymes that can digest them while non-biodegradable substance cannot be broken down by any enzymes. They are acted upon by physical processes like heat and pressure.
Question: How can you help in reducing the problem of waste disposal? Give any two methods. Answer: The following measures can be adopted for reducing the problem of waste disposal:. Two ways in which non-biodegradable substance would affect would affect the environment are: a Would result in accumulation of garbage around in our environment. If we kill all the organisms in our tropic level the number of individual in the next tropic levels.
The next tropic level will decrease due to non-availability of food.
After I was immaturehowever elementary sufficient to paddle the integrate miles if need be. Essay a little boat and stream questions class 10 generation of technique is ordinarily burdensomeI used the approach well known as spiling that uses the compass to switch a simple form of a keel rabbit to a template? The scientist seems to be receiving Lorem lpsum 285 boatplans/2020/european-river-boat-cruises-2020-read link demeanour during the shelf filled with specimens.
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