Write the effective remedy found by Ahmed Khan of Bengaluru for the efficient use of the plastic waste generated by big cities.

(a) Why are the colourful polysterene and plastic packaging used for protecting the food, considered an environmental menace? (b) Write about the remedy found for the efficient use of plastic waste by Ahmed Khan of Bangalore.

(a) Why are the colourful polysterene and plastic packaging used for protecting the food, considered an environmental menace? (b) Write about the remedy found for the efficient use of plastic waste by Ahmed Khan of Bangalore.

(i) Write down the contribution of Ahmed Khan in Remedy of plastic Waste. (ii) write down the contribution of Amrita Devi Bishnoi is conservation of forest

Large quantities of sewage is generated everyday in cities and towns, which is treated in Sewage Treatment Plants (STPs) to make it less polluted. Given below is the flow diagram of one of the stages of STP. Observe the given flow diagram and answer the questions accordingly (a) Why primary effluent is passed into large aeration tanks? (b) Write the technical term used for the sediment formed? Mention its significance (c) Explain the final step that results in the formation of biogas in the large tank before the treated effluent is released into water bodies.

Read the following statements and select the correct ones. (i) Ahmed Khan, a plastic sack manufactturer of Bangalore, in 1998, developed polyblend, a fine powder of recycled modified plastic. (ii) In collaboration with RV College of Engineering and Bangalore City Corporation, he proved that the mixture of polyblend and bitumen was better for road carpeting as it had better water repellent property. (iii) By 2002, more than 40 km roads of Bangalore were laid with the help of Khan's mixture (iv) Rag pickers who used to get 0.40 per kg of plastic waste started getting 6.00 from Ahmed Khan. (v) INnovation like polyblend might help the modern society from being smothered with plastic waste.

Answer question numbers 4(a)-4 (d) on the basis of your understanding of the following paragraph and the related studied concepts: India today is facing the problem of overuse of resources, contamination of water and soil and lack of methods of processing the waste.The time has come for the world to say goodbye to "single-use plastics".steps must be undertaken to develop environment-friendly substitutes, effective plastic waste collection and methods of its disposal. Indore treated 15 lakh metric tonnes of waste in just 3 years,through biomining and bioremediation techniques.Bioremediation involves introducing microbes into landfill to naturally 'break' it down and biomining involves using trommel machines to shift through the waste to separate the 'soil' and the waste component.The city managed to chip away 15 lakh metric tonnes of waste at a cost of around Rs.10 crore.A similar experiment was successfully carried out in Ahmedabad also. (a) State two methods of effective plastic waste collection in your school. (b) Name any two uses of "single-use plastic" in daily life. (c) If we discontinue the use of plastic,how can an environment-friendly substitute be provided? (d) Do you think microbes will work similarly in landfill sites as they work in the laboratory?Justify your answer.