NCERT Solutions Curiosity Chapter 11 .3 Energy from the Sun

Q1.

World Water Day is observed on 22nd March every year. Find out its importance.

Answer

World Water Day is observed on 22 March every year to remind the whole world that freshwater is limited and must be valued, shared fairly and kept clean.

It was started by the United Nations and has been observed since 1993.
Every year has a theme — for example groundwater, glaciers, or water for peace — so that one problem gets everybody’s attention.
Its main goal is that every person on Earth should get safe drinking water and sanitation.
Schools, panchayats and towns mark it with rallies, cleaning of ponds and wells, poster and slogan competitions, and pledges to fix leaking taps.

Why a whole day for water: a very small fraction of the Earth’s water is freshwater that is easy to reach, and it is shared by every human being, animal and plant. A fixed day each year makes governments report what they have done and makes ordinary people think about their own habits.

Try This: On 22 March, count the taps in your school, check how many drip, and hand the list to your teacher. That is a real World Water Day activity, not just a poster.

Q2.

We use heat and light from the Sun for various purposes. What are some of the activities for which we need heat and light? Bhoomi draws some pictures to show the uses of heat and light from the Sun. Help her by adding more examples. Draw the pictures and write their descriptions in the space provided.

Answer

Bhoomi has already drawn two — plants making food and drying of clothes. Here are more pictures you can add, with their descriptions.

Picture to draw	Description to write under it
Chillies / mango slices on a mat	The Sun’s heat dries them so they can be stored and used when fresh ones are not available — exactly what Ajji is doing
Papads and vadis drying on the terrace	Sun-drying removes water so the food does not spoil
Grain spread out on the threshing floor	Farmers dry paddy and wheat in the Sun before storing it
Solar panels on a roof	They capture the Sun’s energy and produce electricity
Solar cooker	Food is cooked directly by the Sun’s heat, with no fuel
Solar water heater	Water for bathing is heated by the Sun
Salt pans by the sea	Sea water evaporates in the Sun and leaves common salt behind — as in Gujarat and Tamil Nadu
Clothes and books put out in winter sunshine	Sunlight dries the damp and keeps away fungus and germs
A child playing outdoors in the morning Sun	Sunlight helps our body make vitamin D for strong bones
The water cycle — sea, cloud, rain	The Sun’s heat evaporates water and gives us rain

The common thread: in every one of these, the Sun does the work that would otherwise need fuel, electricity or money. That is why the Sun is called the main source of energy on Earth.

NCERT Solutions Curiosity Chapter 11 .3 Energy from the Sun — In-text Questions