The Fundamental Unit of Life — Science STD 9 — Question

Name the stain which is commonly used to study plant cells.

 A change in the physical state can be brought about:

A particle P has 18 electrons, 20 neutrons and 19 protons. This particle must be:

1. A molecule.
2. A binary compound.
3. An anion.
4. A cation.

Intercalated disc is present in:

The number of valence electrons in a graphite atom is:

1. 2
2. 4
3. 3
4. 5

Sun causes weathering of rocks through:

1. Mechanical force.
2. Physical phenomena.
3. Chemical changes.
4. Biological changes.

A cell placed in solution swells up. The solution is:

1. Hypertonic
2. Isotonic
3. Hypotonic
4. Both a and b

Which of the following has the highest n/p ratio:

The symbol of a metal element which is used in making thermometers is:

1. Ag
2. Hg
3. Mg
4. Sg

The symbols of the elements cobalt, aluminium, helium and sodium respectively written by a student are as follows. Which symbol is the correct one?

1. CO
2. AL
3. He
4. So