हिंदी
Tamil Nadu Board of Secondary EducationHSC Science Class 11

Revision: Biology Zoology >> Organ and Organ Systems in Animals Biology (Botany and Zoology) HSC Science Class 11 Tamil Nadu Board of Secondary Education

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Key Points

Key Points: Frog
  • Frogs (Rana tigrina is the most common species in India) are cold-blooded (poikilothermic) amphibians belonging to the class Amphibia, phylum Chordata.
  • Frogs can change colour to blend with their surroundings, a process called camouflage or mimicry, which protects them from predators.
  • Dormancy during summer is called aestivation, and dormancy during winter is called hibernation; frogs seek shelter in deep burrows during both.
  • Cardiac muscle tissue is branched with communication junctions at fusion points, found only in the wall of the heart and is responsible for its rhythmic contraction and relaxation.

Concepts [3]

  • Earthworm - Lampito Mauritii
  • Cockroach - Periplaneta Americana
  • Frog
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