Examples of chemicals produced by plants as a defense against grazers and browsers:
$I.$ Nicotine
$II.$ Caffeine
$III.$ Quinine
$IV.$ Strychnine
$V.$ Opium
Choose the correct combination.

  • A
    $I$ and $II$
  • B
    $I, II, III$ and $IV$
  • C
    $I, II$ and $III$
  • D
    $I, II, III, IV$ and $V$

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Give scientific reasons: The members of a population do not breed with other populations.

In which type of interaction do both organisms experience negative effects?

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