Our Environment
- Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage? The damage to the ozone layer a cause for concern because: It causes skin darkening, skin cancer, ageing, and corneal cataracts in human bei... 1
- If all the waste we generate is biodegradable, will this have no impact on the environment? If all the waste generated would be biodegradable this will also create problem. As the numbers of decomposers will be quite low so wastes c... 1
- What are the problems caused by the non-biodegradable wastes that we generate? The problems caused by non-biodegradable wastes are: The cause biomagnification. They increase pollution. They make environment unclean. The... 1
- What is biological magnification? Will the levels of this magnification be different at different Biological magnification is defined as the phenomena of accumulation or increase in the concentration of some toxic substances at each troph... 1
- Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Impact of removing all organisms of a trophic level is different for different trophic levels. For example, if we remove producers from a fo... 1
- What will happen if we kill all the organisms in one trophic level? If we kill all the organisms of one trophic level it will create an imbalance in the ecosystem. As an Example, In a food chain Grass → Dear... 1
- Which of the following are environment-friendly practices? (a) Carrying cloth-bags Correct option is d) All of the above 2
- Which of the following constitute a food-chain? (a) Grass, wheat and mango Correct option is b) Grass, goat and human 2
- Which of the following groups contain only biodegradable items? (a) Grass, flowers and leather The correct option is c) Fruit-peels, cake and lime-juice 2
- How can you help in reducing the problem of waste disposal? Give any two methods. We can help in reducing the problem of waste disposal by these methods: By separating biodegradable substances from non-biodegradable substa... 1
- What is ozone and how does it affect any ecosystem? Ozone (O3) is a molecule, made up of three atoms of oxygen. Ozone (O3) forms a layer in the upper atmosphere. It is very essential for the l... 1
- What is the role of decomposers in the ecosystem? Various role played by decomposers in the ecosystem are: They clean the environment. They decompose biodegradable substances into useful sub... 1
- What are trophic levels? Give an example of a food chain and state the different trophic levels in it. 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 for... 1
- Give any two ways in which non-biodegradable substances would affect the environment. Non-biodegradable substances affect the environment by: They contaminate soil and water resources as they cannot be decomposed by micro-orga... 1
- Give any two ways in which biodegradable substances would affect the environment. Biodegradable substances affect the environment by: The biodegradable substances such as tree leaves, plant parts, and kitchen wastes can be... 1
- Why are some substances biodegradable and some non-biodegradable? Substances are classified as biodegradable and non-biodegradable because some substances can be decomposed by microorganisms and some cannot... 1