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Darwin’s finches show a variety of beaks suited for eating large seeds, flying insects and cactus seeds.

  1. A
    Darwin’s finches show a variety of beaks suited for eating large seeds, flying insects and cactus seeds.
  2. B
    Ancestral seed-eating stock of Darwin’s finches radiated out from South American mainland to different geographical areas of the Galapagos Islands, where they found competitor-free new habitats.

Solution & Step-by-step Explanation

Darwin’s finches are an excellent example of adaptive radiation where species gene pools adapted for long-term survival via their offspring. The ancestral seed-eating stock radiated from the South American mainland to various Galapagos Islands. Due to the absence of competitors and different environmental pressures (divergent evolution), their beaks evolved into different shapes and sizes suited for specific food sources like large seeds, insects, and cactus. Both assertion and reason are true and the reason is the correct explanation of the assertion.

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Darwin’s finches show a variety of beaks suited for eating large seeds, flying insects and cactus seeds.

Assertion (A)

Darwin’s finches show a variety of beaks suited for eating large seeds, flying insects and cactus seeds.

Reason (R)

Ancestral seed-eating stock of Darwin’s finches radiated out from South American mainland to different geographical areas of the Galapagos Islands, where they found competitor-free new habitats.

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