After infection of germs immunity acquired is

  • A

    Active immunity

  • B

    Passive immunity

  • C

    Natural immunity

  • D

    Both $(a)$ and $(b)$

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Read the following sentences and choose correct sentences

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$2.$ Salmonella typhi directly affect the respiratory system

$3.$ Amoebiasis and Ascariasis are caused by contaminated water

$4.$ Internal bleeding, anemia muscular pain are symptoms of elephantiasis

Which of the following is an $STD$

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Secondary metabolites such as nicotine, strychnine and caffelne are produced by plants for their :

  • [NEET 2020]

Kwashiorkar disease develops due to