Students, you may need to practice a lot while preparing for CBSE board exams and other exams. However, how do you decide on the questions or topics to prepare for? Therefore, we have come up with sets of important CBSE questions across grades that are based on the latest syllabus and exam pattern. Download now!
Important questions based on NCERT syllabus for Chapter 16 - Garbage In, Garbage Out:
Question-1: What do you mean by source reduction of wastes? Write three things that you use in your daily life which can be reused and recycled?
Solution: Source reduction of waste is the best method of waste management in which wastes are recycled at the site of production and some other useful substance are produced. Production of bio-gas using human excreta is an example. Three things that we use and can be recycled are: a. Paper b. Plastics c. Vegetable and fruit peels into compost.
Question-2: Why earthworms are called farmer’s friend?
Solution: The type of earthworms called red worm is used for composting. This method of preparing compost with the help of red worms is called vermicomposting. Red worms have a special structure called gizzards in their bodies with which they grind food material and convert it into manure. Thus they help in increasing the fertility of the soil. Thus they are called as Farmer’s friend.
Question-3: Antisha lives in Bangalore;she went to home for a week which is too far from Bangalore. After a week, when she came back her apartment kitchen was smelling too bad. She found that the smell was from the dustbin. What will be the reason for the smell and how will you help her?
Solution: The dustbin contains the kitchen wastes. The waste started to degrade with the help of microorganisms present in the surrounding, they produce gases which is the reason for the smell. We can separate out the degradable and non-degradable wastes.Useful garbage components are those that can be decayed easily.Useful garbage components are fruit and vegetable waste, plant and animal waste, tea leaves, coffee grounds and paper.These useful components of garbage are converted into manure in the soil.Non-useful(non-degradable) garbage components include polythene bags, plastics, glass and aluminium foils. These take longer time to decay. When non-useful components decay, they release harmful gases that damage the environment. To avoid the adverse impact, these items can be sent for recycling.