Ans 1) Paper cups have been working for centuries. Such advantages of paper cups are that they are biodegradable which means they break down over time without harming the environment. While for plastic cups, they are the latest invention. Though plastic damages the environment where everybody is concerned! Firstly, you may be knowing that paper is hundred percent microwave free. Whereas plastic has possibilities to burn your microwave! Paper is made from the environment's green trees whereas in plastic complex material are used. Paper cups can be crumbled very easily just like we do to paper.Plastic is a complex substance which can not be crumbled very easily.Therefore paper cups are the cups over plastic cups.
Ans 2) First we have to know the meanings.So biodegradable materials are materials that can break down into different natural components and can recycled into the life cycle naturally.Such examples can be paper(as discussed above), rotten vegetables, dead animals etc. There is no need for any human intervention in this processes.
Non biodegradable materials are materials that does not break down into natural components and can live in our environment for a very long time. Such examples are rubber tyres, electronics, plastics etc.Though they cause a lot of harm into the environment. It isn't healthy or beneficial to our environment. Therefore biodegradable is an easier way and a better way of recycling.
Ans 3)We have to manage our environment because of the reasons shown below:
* We share resources with many different creatures in this world. So we have to share with them and help the remaining by ourselves. So many of our resources become limited for us. So we can't avail many resources.
* Every 1 nano-second a mother gives birth to her baby/babies. This is the situation for only India. Think about what would it be for our entire world. The human population is increasing at a tremendous rate! Birth rate is increasing while death rate is decreasing!
* A new generation is beginning. We have to give a good start to this generation. We can't just finish up all the resources and leave them empty handed in the future. So we have to limit our supplies.
Ans 4) Dams are important because they supply us drinking water and even give jobs for our water industry. It helps in many more ways. People want bigger dams for more irrigation and jobs. It even helps in preventing floods.
Hope it helps. Please vote it the brainiest answer.