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Why are some substances biodegradable and some non-biodegradable? Answer Substances are classified as biodegradable and non-biodegradable because some substances can be decomposed by microorganisms and some.

Substances that are broken down into simple soluble forms are called biodegradable substances and the substances that are not decomposed by microorganisms into harmless substances are called non biodegradable substances. Give any two ways in ncert solutions class 10th our environment editor biodegradable substances would affect the environment. This will enhance the soil fertility.

These substances after decomposition release that carbon back into the atmosphere. Give any two ways in which non-biodegradable substances would affect the environment. Page No: 1. What are trophic levels? Give an example of a food chain and state the different trophic levels in it. Answer The various links or steps in a food chain at which the transfer of food and energy takes place are called trophic levels.

The producers form the first trophic level as they manufacture food. The primary consumers form the second trophic level, the secondary consumers form the third, and the ncert solutions class 10th our environment editor consumers form the fourth trophic level.

Ncert solutions class 10th our environment editor the above fig. Grass is the producer which is eaten by the grasshooper known as primary consumer.

Then the grasshooper is eaten by shrew, secondary consumer and lastly shrew eaten up by owl, tertiary conusmer.

The levels of biomagnification will be different at different trophic levels. For example, in a pond of water, DDT was sprayed and the producers were found to have 0. Since many types of planktons are eaten by some fishes and clams, their body accumulates 0. Sea gull that feeds on clams accumulates more DDT as one sea gull eats many clams. Hawk, the top carnivore, has the highest concentration of DDT.

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It is most appropriate to go upon the licence as well as which proceed we have been certain you've gotten pro crusing a waters ncert solutions class 10th our environment editor we. Afterwards how do we get it again underneath a cabinets.

Chapter 4 - Carbon and Its Compounds. Chapter 5 - Periodic Classification of Elements. Chapter 6 - Life Processes. Chapter 7 - Control and Coordination. Chapter 8 - How do Organisms Reproduce? Chapter 9 - Heredity and Evolution. Chapter 10 - Light Reflection and Refraction. Chapter 11 - Human Eye and Colourful World. Chapter 12 - Electricity. Chapter 13 - Magnetic Effects of Electric Current.

Also, students can find our environment class 10 extra questions and answers. Question 1 What are trophic levels? Give an example of food chain and state the different trophic levels in it.

Answer: Trophic Levels : The various steps in a food chain at which the transfer of food or energy takes place are called trophic levels. Question 2 What is the role of decomposers in the ecosystem? Answer: i Decomposers help in decomposing the dead bodies of plants and animals and hence act as cleansing agents of the environment.

Question 1 Why are some substances biodegradable and some non-biodegradable? Answer: The microorganism like bacteria and other decomposer organisms called saprophytes present in our environment are specific in their action. They break down the materials or products made from natural materials say, paper but do not break down man-made materials such as plastics.

So, it is due to the property of decomposer organisms of being specific in their action that some waste materials are biodegradable, whereas others are non-biodegradable. Question 2 Give any two ways in which biodegradable substances would affect the environment. Answer: i Biodegradable substances are decomposed by the action of microorganisms and decomposed materials are recycled through geo-chemical cycle.

Question 3 Give any two ways in which non-biodegradable substances would effect the environment. Answer: i They cause air, water and soil pollution. Question 1 What is ozone and how does it affect any ecosystem?

Answer: Ozone O 3 is an isotope of oxygen, i. At the higher levels of the atmosphere, ozone performs an essential function.

It shields the surface of the earth from ultraviolet UV radiations from the sun. These radiations are highly damaging to organisms. Ultraviolet rays can cause skin cancer. Question 2 How can you help in reducing the problem of waste disposal? Give any two methods. Answer: i Recycling : The solid wastes like paper, plastics and metals, etc. Question 1 Which of the following groups contain only biodegradable item?

Question 2 Which of the following constitutes a food-chain? Question 3 Which of the following are environment friendly practices? Question 4 What will happen if we kill all the organisms in one trophic level? Answer: The food chain would end and ecological balance would be affected.

Question 5 Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem? Answer: Yes, the impact of removing all the organisms in a trophic level will be different for different trophic levels. For example, on removing producers; herbivores would not be able to survive or they would migrate and ecosystem would collapse.

If herbivores are removed, producers would grow unchecked and carnivores would not get food. If carnivores are removed, herbivores would increase to unsustainable levels and could destroy the producers. If decomposers are removed, the dead animals would pile up due to which the environment would become polluted. In addition to this, if dead animals will not decompose, the recycling of nutrients in the soil will be stopped and its fertility will be reduced.

As a result the green cover of the earth will be lost. Thus to maintain the balance of the ecosystem the presence of organisms is necessary at each trophic level. Question 6 What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?

Answer: Biological magnification : The increase in concentration of harmful chemical substances like pesticides in the body of living organisms at each trophic level of a food chain is called biological magnification.

Yes, levels of bio-magnification would increase as the trophic level increases and would be the highest for topmost trophic level. It would affect their biological process such as growth, reproduction, etc. Question 7 What are the problems caused by the non-biodegradable wastes that we generate? Answer: The problems caused by the non-biodegradable wastes are :.

Question 8 If all the waste we generate is biodegradable, will this have no impact on the environment? If it is disposed off properly, the problem of air, water and soil pollution can be lessened to an extent.

There would be less health problems and humans would be disease-free. But if it is not disposed off properly, it will affect the environment adversely. Question 9 Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage? Answer: The damage to the ozone layer is a cause for concern because if the ozone layer in the atmosphere disappears completely, then all the extremely harmful ultraviolet radiations coming from the sun would reach the earth.

These ultraviolet radiations would cause skin cancer and other ailments in men and animals and also damage the plants. Our environment: Eco-system, Environmental problems, Ozone depletion, waste production and their solutions.

Biodegradable and non-biodegradable substances. Formulae Handbook for Class 10 Maths and Science. Question 1. Why are some substances biodegradable and some non-biodegradable? Answer: Substances that are broken down by biological processes are said to be biodegradable.

In our environment, many of the substances are broken easily by decomposers bacteria and fungi as they possess specific enzymes for such activity.

However, there are other substances also which are not broken down in this manner and are known as non-biodegradable substances. Since these substances are not degraded by bacteria and fungi, so they persist for a long time.

These non-biodegradable substances will be acted upon by physical processes like heat and pressure. Question 2. Give any two ways in which biodegradable substances would affect the environment. Question 3. Give any two ways in which non-biodegradable substances would affect the environment. What are trophic levels? Give an example of a food chain and state the different trophic levels in it. Answer: Each step or level of the food chain forms a trophic level.

Consider the following food chain:. What is the role of decomposers in the ecosystem? Answer: Class 10th Ncert Our Environment Tool Role of decomposers in the ecosystem :. What is ozone and how does it affect any ecosystem?

Answer: Ozone O 3 is a molecule formed by three atoms of oxygen. At the higher of the atmosphere, it shields the surface of the earth from ultraviolet UV radiation from the Sun. It may affect any ecosystem in the following ways :. How can you help in reducing the problem of waste disposal? Give any two methods? Which of the following Ncert Solutions Of Our Environment Class 10th groups contain only biodegradable items? What is the role of decomposers in the ecosystem?

All the elements that are present in the body on which decomposers act is released back to the nature. Decomposers maintain balance in the nature and plays an important role in the environment. What is ozone and how does it affect any ecosystem?

Ozone is a molecule of oxygen with 3 atoms its formula is O3. The ultra violet radiations split oxygen into free oxygen atoms, these atoms combine with oxygen molecules to form ozone. Ozone Ecosystem: At ground level ozone is poisonous but at higher level it is very useful as it protects all living organisms from harmful UV radiations of the Class 10th Ncert Our Environment Apk sun. How can you help in reducing the problem of waste disposal? Give any two methods. To reduce the.

Which of the ,following groups contain only biodegradable items? Which of the following constitute a food-chain? Which of the following are environment friendly practices? What will happen if we kill all the organisms in one trophic level? If all the organisms in one trophic level are killed then all the organisms of next trophic level which are dependent on these are killed.

Next trophic levels will no! Will the impact of removing all the organisms in a trophic level be different for different trophic levels?

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