Components of Food — Science STD 6 — Question

State whether the following statements are true or false:
Polyester is a natural fibre.

Write the type of joint which is used for the following movements:
A cricket bowler bowls the ball.

Have you ever observed white patches on the dark coloured clothes you wear during hot summers? How are these patches formed?

Name two foods each rich in:
Starch.

Name some plants found on mountains.

How can one destarch the leaves of potted plant without plucking, them?

Activity.Magnetise an iron needle using a bar tnagnet. Now, insert the magnetised needle through a small piece of cork or foam. Let the cork float in water in a bowl or a tub. Make sure that the needle does not touch the water (Fig.). Your compass is now ready to work.
Make a note of the direction in which the needle points when the cork is floating. Rotate the cork, with the needle fixed in it, in different directions. Note the direction in which the needle points when the cork begins to float again without rotating. Does the needle always point in the same direction, when the cork stops rotating?

How do the shipmen find the direction even when north pointing pole star is not visible?

What are insulators?