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How do you deal with authority?

Lysergic acid diethylamide (LSD) is a drug used as a

In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/phrase.

good Samaritan

Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.

The antigen-antibody immunological reaction is used to be regarded as typical of immunological responses. Antibodies are proteins synthesized by specialized cells called plasma cells, which are formed by lymphocytes (cells from the lymph system) when an antigen, a substance foreign to an organism's body, comes in contact with lymphocytes. Two important manifestations of antigen-antibody immunity are lysis, the rapid physical rupture of antigenic cells and the liberation of their contents into the surrounding medium, and phagocytosis, a process in which antigenic particles are engulfed by and very often digested by macrophages and polymorphs. The process of lysis is executed by a complex and unstable blood constituent known as complement, which will not work unless it is activated by a specific antibody; the process of phagocytosis is greatly facilitated when the particles to be engulfed are coated by a specific antibody directed against them.

One of the two important manifestations of antigen-antibody immunity is lysis while the other is

In the following question, four words are given out of which one word is correctly spelt. Select the correctly spelt word.

According to an estimate, almost ___ percent forests have been lost in the tropics, compared to only 1 percent in the temperate region.

Fog, clouds, mist are examples of _______.

Two vectors are said to be equal if