Grade Six Science
Welcome to another lesson in Science. How was your first week back at school? Was it good? 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. Now is the time to be even more focused on your work. Revise a lot and keep on your thinking caps. Keep working hard and you will surely be successful. We have been looking at the senses, their organs and how they work over the past few weeks. This week we will find out about some types of materials.
Let’s look at some important materials that we know.
WOOD
Where does wood come from? Wasn’t that easy? Name some types of wood that we have in Guyana. In which areas can these trees be found? Work on this with a friend. It would be fun. You could do it like this.
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.
A wooden dining table 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 o note that we should keep on planting new trees to replace the ones cut down, so that we don’t run out eventually.
PLASTICS
Plastics have many useful properties. List at least four to a friend.
1. They can be made to take on any shape. 2. They are light.
3. They can be coloured, opaque or transparent. 4. They are strong.
5. They are good insulators.
6. They are waterproof.
7. They are non-magnetic.
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 topic,’ The Soft Drink Manufacturers Should Rethink Their Use Of Plastic Bottles’
FABRICS
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 Wool Nylon
Light and wool Dries easily 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.
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.
Not all metals are attracted to magnets.
Iron, steel
Aluminium, brass, copper
Did you know that some magnets are stronger than others? Remind yourselves of the work you did on magnetism.
*Here are some general 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.
Only ONE answer is correct
YES
NO
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. Where does a young plant get food when it is begin
ning to grow?
A. From the stem
B. From the root
C. From the leaf
D. From the seed
3. 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
5. 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 clouds?
A. It evaporates.
B. It freezes.
C. It condenses.
D. It sublimes.
Until next week, DV, goodbye, Boys and Girls! continue to be focused and to be safe.
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