active and passive objects

Communication Systems..

Look at these sentences: - Ram thanked Hari. Hari was thanked by Ram. In the first sentence the emphasis is on the doer, Ram. In the second sentence the emphasis is on the action, was thanke..

Active Voice - A verb is in the Active Voice when its form shows that the person or thing denoted by the subject is the doer of the action. In all these sentences the person denoted by the subject does something. These verbs are in Active Voice. Jim helps Joseph The ca..

Active Immunity - Active immunity develops as a result of the contact of an individual with pathogenic organisms or their products. They stimulate the body to produce antibodies in response to the antigens. The immunity thus produced is specific for a particular disease. For e.g..

Hold a pin erect on a pile of papers. Keep another pin next to it upside down in such a way that its flat head rests on the pile. Press both these pins down by placing a flat object such as duster. We observe that pin which is erect pierces through the pile of paper..

The transport of materials across the cell membranes with the help of energy is called active transport. Both diffusion and osmosis are passive transport mechanisms, not requiring energy. Active transport helps in the transport of ions across the membranes of the cell..

Microscope Parts and Working - A Microscope You need to get acquainted with the usage of the microscope, for observing cells. On the screen is the figure of a light microscope. Study the parts and learn their names. The specimen to be observed is placed on a glass slide on the stage under an o..

Metals and Non-metals..

Differentiation Animation..

Refraction of Light..