(i) Timber is used to build houses and in making furniture.
(ii) We use wood for these purposes due to their features like durability, stylish finishing and resistance to temperature changes.
(iii) Commercial timber is classified into hardwood and softwood.
(iv) Hardwood is used in construction work and in making furniture.
(v) Softwoods have a wide range of applications such as making plywood and paper making.

(i) Noise pollution affects the environment. Unpleasant or loud sounds distrub us. This is called as noise pollution.
(ii) Loud music the sounds of motor vehicles, fireworks and machines causes noise pollution.
(iii) Continuous noise disturbs our sleep and does not let us to study and also it make stress and health impacts.
(iv) It is also disturb animals, bird and whales in under water.
(v) To reduce noise pollution lower the volume when you watch TV or listen to music.
(vi) Remind drivers not to use the horm too much.
(vii) Avoid fire works and do not speak loudly.

Aim: Soap manufacturing.
Requirements:
i) 35 ml of water.
ii) 10 ml of NaOH.
iii) 60 ml of coconut oil.
Procedure:
i) Cover your work area with old newspaper.
ii) Take 35 ml of water in a jar.
iii) Add 10 gram of concentrated NaOH and allow it to cool.
iv) Then add 60 ml of coconut oil drop by drop and stir it well.
v) On getting dried, soap can be obtained.

(i) Dr. Rajendra Singh is known as "Waterman of India".
(ii) He is a well - known water conservationist and environmentalist.
(iii) His team built rainwater storage tanks, check dams and other timetested as well as path - breaking techniques.
(iv) His team built over 8600 johads to collect rain water for all seasons. It has brought water back to over 1000 villages and revived five rivers in Rajasthan.
Awards:
(i) He won stockholm water prize in 2005, an award known as "The Noble Prize for water".
(ii) Ramon Magsaysay Award in 2001.
(iii) Jamnalal Bajaj Award in 2005.

(i) Potable water is the water which is safe to drink. On an average the human body requires 2-3 liters of water per day for proper functioning.
(ii) It is transparent.
(iii) It is odourless and colourless.
(iv) Cleaned of harmful contaminants.
(v) It is harmless or free from disease causing bacteria.

i) Place the iron needle on a table. Now take a bar magnet and place one of its poles near one edge of iron needle and rub from one end to another end without changing the direction of the pole of the magnet. Repeat the process for 30 to 40 times.
ii) Bring a pin or some iron filings near the iron needle to check whether it has become a magnet. Does the iron needle attract the pin / Iron filing? If not continue the same process for some more time.

Palm tree is monocot plant.Always monocat trees give only softwood.So we can't get hardwood from palm trees. 

(i) Dengue and Malaria will spread by mosquitoes.
(ii) If the waste is increase leads to occumulation of water can able to growth of mosquito and can cause diseases.

If we keep a strong bar magnet above the glass of water, all pins inside the water will come up due to its attraction towards the magnet.

Some of the plants around us are good in healing our diseases. These plants are considered as medicinal plants.

Any substance that causes polution is known as pollutant. Chemicals, pesticides, smoke, crackers are the Pollutant.

There are four major kinds of pollution:
i) Air pollution
ii) Water pollution
iii) Land (soil) pollution
iv) Noise pollution

water, Sodium hydroxide and coconut oil.

The cold surface of the bottle containing icy water cools the air around it and the water vapour of the air condenses on the suface of the bottle. This process is also the result of condensation of water vapour.

Hardware: Hardware is the parts of a computer which we can touch and feel.
Software: Software are programmed and coded applications to process the input information.

(i) Earthworms take organic wastes as food and produce compost castings.
(ii) They improve the soil health and consequently plant health.
(iii) Because of the multitude of services, Earthworms are known as Farmer's friend.

71% of earth's surface is covered with water. The fresh water is only 3%. It remains the same, But the water needed for plants, animals and man is increasing day by day. So we face water scarcity.