define active and passive

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..

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 actio..

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..

Communication Systems..

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 cells..

Immunity is said to be passive when antibodies produced in another organism are injected into a person to induce protection against diseases. Passive immunity is developed for rabies, tetanus toxin, or salmonella infection. It has the advantage of providing immediate relief. But..

It is the absorption of minerals without direct expenditure of metabolic energy. Passive absorption of ions by root system was demonstrated by Briggs and Robertson (1957..

Passive Absorption - It is the absorption of minerals without direct expenditure of metabolic energy. Passive absorption of ions by root system was demonstrated by Briggs and Robertson (1957). (i) Mineral salt absorption is not affected by temperature and metabolic inhibitors. (..

The absorption of certain nutrients and water takes place by passive absorption. In this process, there is no expenditure of energy. The absorption depends on the concentration gradient across the cell membranes of the villi. If the nutrients are more in concentration in the lumen they a..

Look at the picture above. At present this house is in a terrible state. Suggest what would be done to make it fit for a student to live and work and use different modals such as should, ought to, must e..