Last seen: Sep 30, 2021
(d) Cloth-bags are biodegradable, switching off unnecessary light and fans conserves electricity and limited use of petrol/diesel causes less pollutio...
(b) Each step of food chain form a trophic level. Producers (grass) forms the first trophic level, herbivore (goat) the second and carnivore (human) t...
(a), (c) and (d) substances that are broken down (decomposed) by the biological processes are said to be biodegradable e.g. fruit-peels, cake, lime-ju...
(c) The trophic levels represent the transfer of food or energy through various steps or levels in the food chain. Producers harness the maximum energ...
(d) All the living organisms get energy directly or indirectly from the sunlight reaching the surface of Earth.
The ozone shields the surface of the earth from ultraviolet (UV) radiation from the sun. These radiations are highly damaging as they can cause cancer...
Biodegradable waste will be recycled easily by the decomposers such as bacteria and fungi. It will have only this bad impact on our environment that, ...
(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 biol...
The accumulation of harmful chemicals in the body of living organisms at different trophic levels in a food chain is called biological magnification. ...
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- pop...
(c) Fruit-peels, cake and lime-juice
(i) By changing our lifestyle and change in attitude will reduce disposable waste. (ii) Reducing packaging. (iii) Recycling of waste. (iv) Prepa...
Ozone (O3) 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) r...
Role of decomposers in the ecosystem: They help in breaking down the complex organic into simple inorganic that go into the soil and are used up b...
(i) These inert substances simply persist in the environment. This means that these substances require land area for dumping. (ii) Excess of fertili...
(i) They may produce foul smell during decomposition process. (ii) They may produce some harmful gases such as ammonia, methane, carbon dioxide, etc...
Substances that are broken down by biological processes are said to be biodegradable. In our environment, many of the substances are broken easily by ...
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 harmfu...
If all the waste we generate is biodegradable, it will also have impact on the environment. If it is disposed off properly, the problem of air, water ...
The problems caused by the non-biodegradable wastes are: If the quantity of non-biodegradable matter increases in the nature then bio-magnificatio...