Tissues — Science STD 9 — Question

Which one is an oil yielding plant among the following?

1. Lentil
2. Sunflower
3. Cauliflower
4. Hibiscus

Which scientist proposed the concept of atomic mass:

An ionic compound will be formed by the combination of one of the following pairs of elements. This pair of elements is:

1. Chlorine and calcium.
2. Calcium and sodium.
3. Sulphur and carbon.
4. Chlorine and chlorine.

Solute concentration is higher is the external solution:

1. Hypotonic.
2. Isotonic.
3. Hypertonic.
4. None of the above.

One of the following elements has an atomicity of ‘one’. This element is:

The material which is added to water during purification process at the water works so as to disinfect it is:

1. Potassium permanganate.
2. Betadine.
3. Chlorine.
4. Potash alum.

In a plant cell, structure, support, and protection of the cell are provided by the:

The ability of nitrogen fixation is found in:

1. Monerans only.
2. Both monerans and protistans.
3. Protistans only.
4. Fungi only.

Which of the following contribute to green house effect?

1. Methane (CH₄).
2. Carbon dioxide (CO₂).
3. Chlorofluorocarbons (CFCs).
4. All of these.

Rutherford experiment of scattering of α-particles showed for the first time that the atom has: