Std 5 EVS 1 Chapter 16 Water – questions and answers

Std 5 EVS 1 Lesson 16 Water – questions and answers

Exercises

1. What’s the solution? Soil in a garden gets washed away with the water due to the slope of the land.

Ans. To prevent soil from washing away with the water due to the slope of the land, one can plant grass, shrubs and herbs.

2. Use your brain power!

How should roads and footpaths be built to make rainwater seep into the ground?

Ans. Roads and footpaths should be built in a slanting position, drains should also be built at the side of the footpath, so that the water can flow into the drains and then seep into the soil.

3. Answer the following questions.

(a) What conditions prevail during a famine?

Ans. During a famine, the water level falls in rivers, wells, lakes, bunds and dams. Some of these may even go dry. The land also dries up due to evaporation. Humans and animals suffer from scarcity of water. There is no water for agriculture.

(b) What works are undertaken to make water available even after the rainy season?

Ans. The government and the people come together to undertake several works such as building smaller reservoirs, contour bunding, stopping the water of the smaller streams by constructing bunds or bandharas, etc

(c) Why is it necessary to stop rainwater?

Ans. To meet the whole year’s need for water, rainwater must be stopped. When it is stopped, it percolates into the soil. As the ground water storage increases, trees get water. Wells, too, get enough water and the land can be cultivated.

(d) What is meant by water management?

Ans. Taking steps to ensure that rainwater will be available even in the period after the rainy season is called ‘water management’.

4. True or false? Correct the wrong statements.

(a) We get rainwater throughout the year.

Ans. False. We get rain water only for four months from June to September.

(b) During a famine, the government moves people and animals temporarily to safe places.

Ans. True

Activities

1. From your friends or elders, or from newspapers, find out in which year a famine had occurred in our State and what measures were undertaken to tide over that period.

2. Collect pictures of flowing water and stagnated water.

Can you recall ?

1. What happens when a spoonful of sugar, sawdust and soil are added to a glass of water?

Ans. When sugar is added to the water, it dissolves completely and disappears in the water.

When sawdust is added, it will float on the surface of the water.

When soil is added it will settle at the bottom of the water.

2. Which are the three states of water?

Ans. Three states of water are

(i) Solid form e.g. ice

(ii) Liquid form e.g. water

(iii) Gaseous form e.g. water vapour

3. What is done to make drinking water clean and safe?

Ans. Ans. To make the water clean it is allowed to stand. This makes the heavy particles settle to the bottom. The water is then filtered. To make the water safe for drinking chlorine is added to kill the germs.

At home we should boil the water before drinking.

Rivers, lakes are our sources of water. How does their water get polluted?

Ans. Waste water from industries is more likely to contain poisonous substances. If all this waste water is let into water bodies as it is, the water bodies become polluted.

Can you tell ?

List the substances that are mixed in the waste water drained out of the kitchen and bathroom in your house.

Ans. The substances that are mixed in the waste water drained out of the kitchen and bathroom in my house are, scraps of vegetables, soap, tea powder, grains of rice, pulses, cereals, etc.

If, at some place, it did not rain for a very long period of time, what would be its effect on the life of the people there?

Ans. Places where it does not rain for a long time, experience a drought. At such places, the water level falls in rivers, wells, lakes, bunds and dams. Some of these may even go dry. The land also dries up due to evaporation. Humans and animals suffer from scarcity of water. There is no water for agriculture. This condition is called a famine.

What’s the solution?

Your class will be visiting a lake which is far away from the city. Arrangements have to be made for the day’s drinking water.

Ans. Each child will be asked to carry a water bottle as well as the school will make arrangements of few water coolers that can be carried in the bus.