Identify the correct statement regarding diseases and immunity.

  • A
    If $B$-lymphocytes and $T$-lymphocytes are damaged for any reason,the body will not produce antibodies against pathogens.
  • B
    Injection of killed/weakened pathogens provides passive immunity.
  • C
    Some protozoans are used to produce the $Hepatitis-B$ vaccine.
  • D
    The injection of antivenom used during a snake bite is an example of active immunity.

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Which cells secrete interferons?

Identify the correct group for primary lymphoid organs.

Differentiate between $T$-lymphocytes and $B$-lymphocytes.

$A$: Live attenuated vaccine is better in terms of immunity provided to the recipient.
$R$: As secondary lymphoid organs,example $Peyer's$ patches are stimulated to protect the individual.

What are $IgA$ and $IgM$?

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