Telangana SCERT Class 7 Science Chapter 14 Solution – Water Too Little To Waste. Here in this post we provides Class 7 Science Water Too Little To Waste Telangana State Board Solution. Telangana State Board English Class VII Medium Students can download this Solution to Solve out Improve Your Learning Questions and Answers.
Telanagana State Board Class 7 Science Chapter 14 Water Too Little To Waste Solution:
(1) Fill in the blanks and give reasons.
(a) Cleaning of water is a process of removing ___________________________
Ans: – Pollutants from the water
Reasons: – Pollutants water contains pollutants such as domestic waste, chemicals, anmas waste. SO pollutants have to be removed from water by a process is called cleaning of water.
(b) Wastewater released by houses is called __________
Ans: – Sewage.
Reasons: – All the wastewater released by houses, industries, hospitality, etc. are called sewage. It does not dissolved in water and has disease causing bacteria and other microbes.
(c) Dried _____ Is used as manure
Ans: – Sludge
Reasons: – The activated sludge is about 97% water. The water is removed by sand drying beds or machines. SO they used as manure, returning, organic matter and nutrients to the soil.
(d) Drains get blocked by ________ and _______ (oils and fats) also answer.
Ans: – Plastics, Toiletries.
Ans: – Drains can be blocked by plastic as they are non biodegradable and toiletries, because they often put into drains, so it blocked.
(2) What is sewage? Explain what it is harmful to discharge untreated sewage into rivers or seas?
Ans: – All the wastewater released by home, industries hospitals, officers and other users are collectively called sewage. Sewage is a liquid waste. Most of it is water, which has dissolved and suspended impurities, disease causing bacteria and other microbes. These impurities are called contaminants.
It untreated sewage is discharges into seas, then the water into rivers and seas would also get contaminated. If this contaminated water is used for drinking, then it can causes many diseases like diarrhoea, malaria, cholera, typhoid etc. That’s why it is harmful to discharge untreated wastes into rivers and seas.
(3) Why should oils and fats not be released in the drain? Explain.
Ans: – Oils and fats harden and block the drains and pipes, as oils and fats are insoluble in water or any other liquid. That’s why it can cause the blocking of the drain, because drains are not deep, it has less dense. So any type of oils and fats should not be released in the drains as they will be floating on that water. Oils and fats also kill the friendly microbes in the drains and blocked them
(4) Describe the steps involved in getting clarified water from waste water.
Ans: – Treatment of wastewater which remove chemical and biological matter that contaminates water. The processes are physical, chemical and biological.
Steps are describes below –
(i) Wastewater contains object like rags, sticks, cars, plastic packet etc are removed by bar screens protects.
(ii) Water than goes to grit and sand removal tand. The speed of the incoming waste water is decreased to allow sand, grit and pebbles to settle down.
(iii) The water is then allowed to settle in a large tank, which is sloped towards the middle, solids like faces settle at the bottom and are removed with a scraper. Now skimmer removes the flotable solids. Now the water so cleared is called clarified water.
(iv) Air is pumped into the clarified water to help aerobic bacteria to grow. Bacteria consume human waste, food waste, soaps and other unwanted matter still remaining is clarified water.
(5) What is sludge? Explain how it is treated?
Ans: – Sludge is a soft, wet mud that s mode of liquid or may be solid components like faces. Sludge is a waste material taken from sewage, The sludge is removed by using scraper.
The sludge is decomposed by anaerobic bacteria. The biogas produced in the process can be used as fuel or can be used to produce electricity.
(6) Untreated human excreta is a health hazard. Explain.
Ans: – Untreated human excreta are a health hazard as it can cause of water pollution and soil pollution. Both the ground water and surface water getting polluted by human excrete. It also causes for many of water borne diseases. Like cholera, typhoid, diarrhoea, polio etc. and it also harms human healths also.
(7) Name two chemicals used to disinfect the water.
Ans: – Two chemicals used to disinfect the water are chlorine and ozone.
(8) Explain the function of bar screens in a waste water treatment plant.
Ans: – In a wastewater treatment plants, bar screen removes large solid objects from water. The waste water is allowed to pass through bar screen so that large solid objects like rags, plastic, bags, napkins, sticks, cans, polythene etc present in wastewater can be removed. These bar screens are used as a primary filtration method in the waste water treatment plant. After remove all the large impurities now it becomes easy to treat the water and remove all smaller impurities which mixed with in water. Here used the chemical treatment which helps is wastewater treatment plant.
(9) Explain the relationship between sanitation and disease.
Ans: – Sanitation and diseases are related to each other because lack of sanitation can cause diseases.
Sanitation involves proper disposal of sewage from our houses and public places. So in which places have sanitation there will no diseases occur. But if sanitation is not any places, then there will various types of diseases occur and spread. So sanitation is must to keep any places to avoid diseases.
(11) What would you do to motivate people in your street utilise toilets?
(1) We should go to villages and organise meeting and educated them about usage of toilets.
(2) Creating awareness on the mind of people on this topic by making street play.
(3) I would motivate people told them that you should not make dirty on road and utilize street, toilet.
(4) I would told them and make the understand about how using toilets increase cleanliness in the environment and also by using toilets we can reduce diseases.
(12) What would happen if there were no microbes that break down wastes in sewage?
Ans: – If there were no microbes that break down wastes in sewage, then the following problems may occure –
(i) Environments will effected hugely by this.
(ii) Aquatic animals will die as it absorbs of waste materials.
(iii) Gathering of waste like human or animal excreta and many others will not be decomposed, for which many problems occur.
(iv) Many germs will spreading in everywhere
(15) Fresh water is scarce. What is your contribution to make your family members aware of the need to save water?
Ans: – Fresh water is scarce. So save every drop of water that we use. It any pipe leakage of tap is found at our home then immediately repairs all of the leakages.
Use bucket of water for bathing instead of shower or bath tubs. Using mugs instead of pipes to water plants and wash cars.
(16) Prepare attest 5 slogans on “Don’t waste water”.
Ans: – Water is our life.
(i) “Save water save live.”
(ii) “Save water and it will save your live.”
(iii) “A drop of water is more valuable than gold.”
(iv) “Water is precious” use it properly.
(v) “Don’t waste water – to fill future needs.”
(19) Have you got any doubt about diseases caused by untreated water? List the out.
Ans: – Untreated water can cause many types of diseases like –
(iii) Worm diseases.
(20) If you see water running off from a public tap what would you do about it?
Ans: – ‘Every drop of water counts’. So obviously, I would go quickly and close the tap.
As water is very much precious for us and also for earth. So we should not waste water.
I can’t allow the waste water whether it is my home or in any other places.