Polio is a highly infectious disease caused by a virus. Its causative agent, poliovirus, was identified in 1908 by Karl Landsteiner. The polio virus invades the nervous system, and can cause total paralysis in a matter of hours.

Correct Option: B

Polio is a highly infectious disease caused by a virus. Its causative agent, poliovirus, was identified in 1908 by Karl Landsteiner. The polio virus invades the nervous system, and can cause total paralysis in a matter of hours.

The wings are modified forelimbs of birds which are the key to bird flight. Each wing composed of three limb bones, the humerus, ulna and radius.

Correct Option: D

The wings are modified forelimbs of birds which are the key to bird flight. Each wing composed of three limb bones, the humerus, ulna and radius.

Plant wilting occurs after excessive loss of water by transpiration and lesser absorption. On a hot day, plants transpire heavily and cannot absorb water speedily to keep pace with transpiration loss, even when there is enough water.

Correct Option: D

Plant wilting occurs after excessive loss of water by transpiration and lesser absorption. On a hot day, plants transpire heavily and cannot absorb water speedily to keep pace with transpiration loss, even when there is enough water.

Haptens are small molecules that react with a specific antibody but cannot induce the formation of antibodies unless bound to a carrier protein or other large antigenic molecule. They are incomplete or partial antigens.

Correct Option: B

Haptens are small molecules that react with a specific antibody but cannot induce the formation of antibodies unless bound to a carrier protein or other large antigenic molecule. They are incomplete or partial antigens.

Pyrolysis is a thermo-chemical decomposition of organic material at elevated temperatures in the absence of oxygen (or any halogen). Pyrolysis generally takes place well above atmospheric pressure at temperatures exceeding above 430 °C.

Correct Option: B

Pyrolysis is a thermo-chemical decomposition of organic material at elevated temperatures in the absence of oxygen (or any halogen). Pyrolysis generally takes place well above atmospheric pressure at temperatures exceeding above 430 °C.