Elements, Compounds and Mixtures — Science STD 7 — Question

Name the two important stages in the process of obtaining metals from ores.

What kind of change is the falling of a tree in a storm?

Which substances are used for making electromagnets?

Can the point of a needle accommodate micro-organism?

Observe a drop of muddy water or water from a stagnant puddle, under the compound microscope.

What are the similarities between the Plant cell and Animal cell?

A bird sitting on a wire, flies, circles around and comes back to its perch. Explain the total distance it traversed during its flight and its eventual displacement.

Why don’t the leaves of lotus plants rotinwatei?

Is carbon dioxide an element?

Are the muscles of the different organs in our body identical?