Statement $I$: $ELISA$ works on the principle of antigen-antibody interaction.
Statement $II$: Infection by a pathogen can be detected by the presence of antigens or by detecting the antibodies synthesized against the pathogen.

The chemical produced by the host plant to protect themselves against fungal infection is:

What is the Pulse Polio Programme of the Government of India? What is $OPV$? Why is it that India is yet to eradicate Polio?

Select the correct option to fill up the blanks.
$(i)$ Diseases which are easily transmitted from one person to another,are called $.....$ diseases.
$(ii)$ In human body,parasite of malaria initially multiplies within the $........$ and then attack the $......$
$(iii) ......$ is the yellowish fluid secreted by mother during the initial days of lactation.
$(iv) ......$ and $.......$ are the primary lymphoid organs.

Lymphocytes secrete a protein which causes the dilation of blood vessels. The protein is

What should be done to prevent mosquitoes from entering the house?