Food: Where Does it Come From? — Science STD 6 — Question

State the two main types of fibres.

What do you mean by luminous objects?

Give an example of a reversible change that takes place when an object is heated.

The deficiency of which mineral causes goiter?

Classify the following materials into electrical conductors and electrical insulators Leather, iron needle, ebonite rod, key, plastic, graphite (pencil lead), wool, silk, acid, pure water, rubber, aluminium, human body, air, salty water.

Name the major nutrients in our food.

How does a cotton field look that is ready for picking?

Name four edibles that are used as spices.

Using the ‘conduction tester’ on an object it was found that the bulb begins to glow. Is that object a conductor or an insulator? Explain.

What do you mean by a joint?