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

How exchange of gases takes place in plants?

A blacksmith heats a piece of iron till it becomes red hot and then beats it into a desired shape. What changes have taken palace in iron on heating?

Provide one word answers to the statements given below.
Help in the movement of body by contraction and relaxation.

When are shadows formed?

Differentiate between diurnal and nocturnal animals.

Classify the following into transparent, opaque and translucent objects:
Wax, spectacles, a heap of salt, a stone, dense smoke, wood, skin, balloon, rubber, membrane of a tabla, blood and milk.

Pitcher plant has green leaves which can prepare food by photosynthesis then why does it eat insects?

What type of motion do the following objects have?
the needle of a sewing machine

Why rubbers and plastic used to cover electric wires and plug tops?

Explain the following observations very briefly.
An empty glass in fact is not empty.