Is Matter Around Us Pure ? — Science STD 9 — Question

Grit of pear is formed of:

For each of the following, use letters to indicate wheather the matter is element (E), compound (C) or mixture (M).

S.No.	Matter	Classification
1.	Water
2.	Mercury
3.	Air
4.	Tin

Heart muscles are:

Direction of motion of a body is given by:

In SI system, the unit of P.E. is:

Jupiter has about 317 times more mass than Earth. What can you infer from this fact? 

Aleuroplasts in a cell store:

1. Starch.
2. Oil.
3. Protein.
4. Nutrients.

Who proposed the cell theory?

1. Schleiden and Schwann.
2. Watson and Crick.
3. Darwin and Wallace.
4. Mendel and Morgan.

According to Dalton, atom combines in a _________ ratio to form compounds.

A man is stranded in the middle of a perfectly smooth island of ice, where there is no friction between the ground and his feet. Under these circumstances,