Grade Six Science

Hello Boys and Girls,

Have you had a good week? Have you been having any quizzes from your teachers recently? Are you working on past examination papers? We know that the NGSA is just around the corner and that you are being kept quite busy. Keep working and you would surely be successful. Let’s look at different types of materials this week.

Let’s look at some important materials that we know.

WOOD

Where does wood come from? Did you answer trees?

Wasn’t that easy? Name some types of wood that we have in Guyana. In which areas can these trees be found? Work with a friend. It would be fun. You could do it like

How can we change wood to make it more useful? What are some of the properties that wood has? Wood can be easily shaped. It can be shaped into a chair as well as the spindles on a stair. It can also float. It can bend, and do you know it can act as an insulator? Wood also needs protecting or it will rot away. What do we use to protect our wooden buildings? If you do not know, find out.

PLASTICS A wooden dining set

Wood can also be burnt to produce heat. It can be made into charcoal. (Find out how these things are done.)

Do you remember that some time ago we discussed that paper comes from trees? Yes, wood is ‘mashed up’ to make paper. There are so many kinds of paper ... with different properties, and used for different jobs.

Can paper be recycled?

It is very important to note that we should keep on planting new trees to replace the ones we cut down, so that we don’t run out eventually.

Plastics have many useful properties. List at least four to a friend.

They can be made to take on any shape.

They are light.

They can be coloured, opaque or transparent. They are strong.

They are good insulators.

They are waterproof.

They are non-magnetic.

FABRICS A plastic water bottle

Can they be got rid or easily? Some plastics can be recycled or reused. They also do not rot. There may be some types of new plastics that do rot (biodegradable). Do find out the truth about this.

Did you know that some plastics can be made into fabrics, such as nylon?

*SOMETHING EXCITING TO DO

Ask your teacher to help you to organise a debate on the following topic: ‘The Soft Drink Manufac-turers Should Rethink Their Use of Plastic Bottles.’

Fabrics are made up of fibres woven together. Some fibres are natural and some are man-made. Put these into their correct categories: silk, nylon, cotton, wool, polyester

Bolts of cloth

Find some samples, put them in your Science scrap book, label them and state their origin.

Let’s look at properties of different fabrics. Try to match the fabrics below with the different properties.

Denim

Silk Dries easily

Wool

Nylon

Some materials are magnetic. Name some of these materials. You will remember that only metals are attracted to magnets. Cutlery, nails hairpins and paper clips are all magnetic. Only metals — no other materials — are attracted to magnets. Wood, plastic and glass (you name a few more examples) are not attracted to magnets. They are non-magnetic.

Only ONE answer is correct

1. Which is the function of the seed coat? A. It manufactures food

B. It protects the embryo

C. It transports minerals

D. It holds up leaves

2. 3. 5.

Light and cool

Hard wearing

Warm

What properties does cotton have? What is it suitable for? Think of the different clothes that you wear, what they are made of and their properties.

Discuss all the things that you have learnt with a friend.

Not all metals are attracted to magnets. Iron, steel - YES

Aluminium, brass, copper -NO

Did you know that some magnets are stronger than others? Remind yourselves of the work you did on magnetism.

*Here are some revision questions for you. If there are any answers of which you are unsure, check your Science notes.

Circle the letter in front of the correct answer.

Where does a young plant get food when it is beginning to grow?

A. From the stem

B.From the root

C.From the leaf

D.From the seed

Which is the reproductive part of the plant? A. The leaf

B. The root

C. The flower

D. The seed

4. Which of the following functions is NOT performed by the stem?

A. Transporting minerals

B. Supporting leaves

C. Storing food

D. Absorbing water

Volcanoes erupt through cracks in the Earth’s crust caused by

A. molten rocks

B. hot gases

C. hot water

D. flowing lava

6. How does water from the rivers and ponds change to form cloud?

A. It evaporates

B. It freezes

C. It condenses

D. It sublimes

Until next week, DV, goodbye, Boys and Girls, and do continue to be safe.