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Organisms and Populations — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYOrganisms and Populations2 Marks
Question
Explain the defence mechanisms evolved in preys to avoid overpopulation of their predators.
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Answer

  1. Certain insect species and frogs have camouflage (cryptic colouration) to avoid detection by their predators
  2. Some animals are highly distasteful to their predators, e.g. monarch butterfly accumulates a chemical by feeding on a poisonous weed during its caterpillar stage.
  3. Some prey are poisonous and hence are avoided by predators.
  4. Plants have developed thorns and spines as defence mechanism against browsing animals.
  5. Some plants produce certain chemicals which affect the metabolism of the herbivores.

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