where will you look for the sporozoites of the malarial parasite?

• Red blood corpuscles of humans suffering from malaria

• Spleen of infected humans

• Salivary glands of freshly moulted female Anopheles mosquito

• Salivary glands of freshly moulted female Anopheles mosquito

Which one of the following acts as a physiological barrier to the entry of microorganisms in the human body? 

• Tears

• Monocytes

• Skin

• Skin

Select the correct statements with respect to diseases and immunisation

• if due to some reason B and T - lymphocytes are damaged, the body will not produce antibodies against a pathogen

• injection of dead/inactivated pathogens causes passive immunity

• certain protozoans have been used to mass produce hepatitis B vaccine

• certain protozoans have been used to mass produce hepatitis B vaccine

Select the correct statement from the ones given below

• Barbiturates, when given to criminals, make them tell the truth

• Morphine is often given to person who has undergone surgery as a pain killer

• Chewing tobacco lowers blood pressure and heart rate

• Chewing tobacco lowers blood pressure and heart rate

Common cold is not cured by antibiotics because it is

• caused by a virus

• caused by a Gram-positive bacterium

• caused by a Gram-negative bacterium

• caused by a Gram-negative bacterium