- Looking for other ways to read this?
- Chapter 14: Human Heredity
- CBSE Class 8 Science Notes
- Chapter 14 human heredity pdf converter
- Biology I Section 14-1 Human Heredity
- Molecular Basis of Inheritance: Class 12 Notes
- Cna cover letter no experience Duties of a Certified Nursing Assistant
- Human Chromosomes
- Chapter 14: Human Heredity (Study Guide)
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.
Looking for other ways to read this?
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?
Chapter 14: Human Heredity
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?
CBSE Class 8 Science Notes
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.
Chapter 14 human heredity pdf converter
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.
Biology I Section 14-1 Human Heredity
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 :.
Molecular Basis of Inheritance: Class 12 Notes
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.
Cna cover letter no experience Duties of a Certified Nursing Assistant
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: 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 :.
Chapter 14: Human Heredity (Study Guide)
How can you help in reducing the problem of waste disposal? Give any two methods? 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? Question 4. What will happen if we kill all the organisms in one trophic level? Answer: If we kill all the organisms in one trophic level, then transfer of energy as well as matter to next higher level will stop. It will lead to over- population at one particular level causing amongst the individuals.
This would seriously disturb the food chain and can cause the collapse of an ecosystem even. Question 5.
Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Answer: Yes, the impact Of removing all the Organisms in a trophic level will be different for different trophic levels. It will not be possible to remove any organism in any trophic level without causing damage to the ecosystem. Question 6. What is biological magnification? Answer: The accumulation of harmful chemicals in the body of living organisms at different trophic levels in a food chain is called biological magnification.
Yes, the concentration of these harmful chemicals will be different at different trophic levels. It will be maximum at the last trophic levels which is mostly of the top carnivores quaternary consumers. Question 7. What are the problems caused by the non-biodegradable wastes that we generate?
Answer: i Non-biodegradable wastes persist in the environment for a long time and cause greater harm to the various members of the ecosystem by causing biological magnification.