Work And Energy — Science STD 9 — Question

One of the following does not show Tyndall effect. This one is:

Unicellular organisms take in oxygen and pass out carbon dioxide through:

1. Diffusion.
2. Exosmosis.
3. Endosmosis.
4. Active transport.

Which of the following will scatter light:

Which of the following has a direct effect on the kinetic energy of particles:

Rutherford’s alpha particle scattering experiment led to the discovery of:

1. Nucleus.
2. Electrons.
3. Protons.
4. Neutrons.

The structure which forms a barrier between the protoplasm of the cell and its external environment in an animal cell, is:

Crop rotation can:

The phylum of sedentary animals is:

1. Mollusca.
2. Echinodermata.
3. Porifera.
4. Both (a) and (b).

Which one of the following is incorrect about tuberculosis?

1. It is caused by Salmonella.
2. It commonly affects lungs.
3. Bacteria release tuberculin toxin.
4. Patient's sputum contains blood.

What is the basic unit of matter and is the smallest particle of an element?