Bacteria

Q.

Jaundice is a disease transmitted by water.

1. True
2. False

Q. Aerobic burning of organic solid wastes at high temperature is called as ________

1. incineration
2. pyrolysis
3. composting
4. land filling

Q. We should throw chemicals like insecticides, paints down the drain.

1. True
2. False

Q.

An open drain system is not a breeding place for which of the following?

1. Flies

2. Mosquitoes

3. Organisms which cause diseases.

4. Snakes

Q. Diseases like diarrhoea can be caused due to ______ pollution.

1. water
2. air
3. soil
4. noise

Q.

What is sorter’s disease? Which microorganism is responsible for this disease?

Q. Why there is expiry date for water bottles?

Q.

Question 5

Water polluted by various human activities causes a number of water-borne diseases. Which of the following is not a water-borne disease?
(a) Cholera
(b) Typhoid
(c) Asthma
(d) Dysentery

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Rita was growing earthworms and she placed them in dry soil. After few weeks, she found them to be dead. One of the cause for this might be that

1. earthworm breathes through moist skin.
2. earthworm requires moist place to stay cool.
3. earthworm drinks water from soil.
4. earthworm breathes through dry skin.

Q.

Which of the following is correct about ozone?

1. It is used to disinfect water

2. It is essential for breathing

3. It absorbs ultraviolet rays

4. It is used to disinfect water and absorb ultraviolet rays

Q.

Which of these chemicals are used to clean water in a water treatment plant?

1. Ozone

2. Chlorine tablets

3. Both ozone and chlorine tablets

4. Sulphur

Q.

What is sorter’s disease? Which microorganism is responsible for this disease?

Q.

Now, Deepika wants to clean water in her water plant, which of the following chemical should she use?

1. Ozone

2. Oxygen

3. Both ozone and chlorine tablets

4. Chlorine Tablets

Q.

Which of the following is true about ozone?

1. It is used to disinfect water

2. It is essential for breathing of living organisms

3. Both (to disinfect water and it absorbs ultraviolet rays)

4. It absorbs ultraviolet rays

Q. Which of the following can kill water purifying microbes?

1. Cooking oils
2. Vegetable peels
3. Paints
4. Paper

Q. ______ is passed through water to disinfect it.

1. Hydrogen
2. Helium
3. Ozone
4. Carbon dioxide

Q. Describe the steps involved in getting clarified water from wastewater.

Q.

Which of the following is true about ozone?

1. It is used to disinfect water

2. It is essential for breathing of living organisms

3. It absorbs ultraviolet rays

4. Both (to disinfect water and it absorbs ultraviolet rays)

Q. Describe the steps involved in getting clarified water from wastewater. [3 marks]

Q. Name four diseases caused by water pollution.

Q. Ramu, a caretaker of swimming pool was using chlorine for disinfectingswimming pool water. His friend Jagat an another swimming pool caretakerwas using ozone in place of chlorine.(a) In your opinion, which is better way of disinfecting water in a swimmingpool.

(b) Mention reason and values associated with your reply.

Q. Choose the actions that can lead to spread of water borne diseases.