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Class 10 Class 12

Darwin's finches are an excellent example of

• seasonal migration

• brood parasitism

A.

Adaptive radiation represents the evolution of new forms is several directions from the common anxcestral type. In 1831 Darwin got an opportunity to travel by H M S beagle for a voyage of world exploration. Beagle sailed to the Galapagos Islands, here Darwin found a living laboratory of evolution. The common birds of Galapagos Islands, the finches were markedly different from the finches of the main land. The closely related species of finches has beaks of different shapes and sizes and adapted for feeding on completely different diet showing adaptive radiation.

The transitional fossil forms, which show the characteristic of two different groups of living animals is called connecting links, eg, Archaeopteryx, Seymouria etc.

Adaptive radiation represents the evolution of new forms is several directions from the common anxcestral type. In 1831 Darwin got an opportunity to travel by H M S beagle for a voyage of world exploration. Beagle sailed to the Galapagos Islands, here Darwin found a living laboratory of evolution. The common birds of Galapagos Islands, the finches were markedly different from the finches of the main land. The closely related species of finches has beaks of different shapes and sizes and adapted for feeding on completely different diet showing adaptive radiation.

The transitional fossil forms, which show the characteristic of two different groups of living animals is called connecting links, eg, Archaeopteryx, Seymouria etc.

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When did life appear on earth ?

500 million years ago.
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What is the phenomenon called when the original drifted population becomes founders?

Founder Effect.
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What conditions were created by Miller in his experiment?

Miller  created electric discharge in a closed flask that contained CH4, NH3, H2 and water vapour at high temperature like 800$°\mathrm{C}$
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Give another name for origin of life from non living matter.

Abiogenesis
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Arrange the following substances in a proper sequence with regard to the formation of chemical constituents at the time of origin of life :

Sugar, methane, nucleic acid and amino acid.

Methane—sugar—amino acid—nucleic acid.
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