Classify the following fibres as natural or synthetic:
nylon, wool, cotton, silk, polyester, jute
Natural fibres: Wool, Cotton, Silk, Jute.
Wool: We obtain wool from sheep and other animals. A fibre that is obtained from the animals are called natural fibres. Cotton: We obtain cotton from the cotton plants. Cotton is a soft fibre that grows in a ball. As we obtain it from the plants; is a natural fibre. Silk: We obtain silk from the silkworm. The best silk is obtained from the cocoon. So we can say that it is a natural fibre. Jute: Jute is obtained from the stem of the jute plant. That is why it is also a natural fibre.
Synthetic fibres: Nylon, Polyester
Nylon: It is man- made fibre. It is a thermoplastic silky material generally used for making rope and thread. Polyester: It is the derived form of coal, petroleum and water that’s why it is called synthetic fibre.
Name two items that are made from coconut fibre.
State whether the following statements are true or false:
a) Yarn is made from fibres.
b) Spinning is a process of making fibres.
c) Jute is the outer covering of coconut.
d) The process of removing seed from cotton is called ginning.
e) Weaving of yarn makes a piece of fabric.
f) Silk fibre is obtained from the stem of a plant.
g) Polyester is a natural fibre.
Fill in the blanks:
a) Plant fibres are obtained from_________ and ________ .
b) Animals fibres are __________ and ___________ .
From which parts of the plant cotton and jute are obtained?
Explain the process of making yarn from fibre.
(a) Which kind of garbage is not converted into compost by the redworms?
(b) Have you seen any other organism besides redworms, in your pit? If yes, try to find out their names. Draw pictures of these.
Rearrange the boxes given below to make a sentence that helps us understand opaque objects.
To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Do you find that all living beings need the same kind of food?
Name the major nutrients in our food.
Name five objects which can be made from wood.
Why do we need to separate different components of a mixture? Give two examples.
Correct the following statements and rewrite them in your notebook.
(a) Stem absorbs water and minerals from the soil.
(b) Leaves hold the plant upright.
(c) Roots conduct water to the leaves.
(d) The number of petals and sepals in a flower is always equal.
(e) If the sepals of a flower are joined together, its petals are also joined together.
(f) If the petals of a flower are joined together, then the pistil is joined to the petal.
Fill in the blanks:
(a) Joints of the bones help in the ——————— of the body.
(b) A combination of bones and cartilages forms the _______ of the body.
(c) The bones at the elbow are joined by a ______________________ joint.
(d) The contraction of the _____________ pulls the bones during movement.
What is a habitat?
Why do we need to separate different components of a mixture? Give two examples.
The height of a person is 1.65 m. Express it into cm and mm.
Name five objects which can be made from wood.
Give two examples of periodic motion.
True or false?
(a) A mixture of milk and water can be separated by filtration.
(b) A mixture of powdered salt and sugar can be separated by the process of winnowing. (c) Separation of sugar from tea can be done with filtration.
(d) Grain and husk can be separated with the process of decantation.
To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Fill in the blanks:
(a) Joints of the bones help in the ——————— of the body.
(b) A combination of bones and cartilages forms the _______ of the body.
(c) The bones at the elbow are joined by a ______________________ joint.
(d) The contraction of the _____________ pulls the bones during movement.
What is a habitat?
Which of the following plants have you seen? of those that you have seen, which one have flowers?
Grass, maize, wheat, chilli, tomato, tulsi, pipal, shisham, banyan, mango, jamun, guava, pomegranate, papaya, banana, lemon, sugarcane, potato, groundnut
If a plant has fibrous root, what type of venation do its leaves likely to have?