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Evolution

Question
CBSEENBI12002679
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Darwin's finches are an excellent example of 

  • adaptive radiation

  • seasonal migration

  • brood parasitism

  • connecting links

Solution

A.

adaptive radiation

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.

Some More Questions From Evolution Chapter

What is meant by the term fossil ?

What is the type of evolution in which the same structure developed along different directions due to adaptations to different needs ?

Name the different eras of geologic time scale.

What is single step large mutation?

Consider a thorn in Bougainvillea and a tendril in cucurbita. Are these two organs homologous or analogous ? Give reason.

Give two examples that represent adaptive radiation.

Which theory attempts to explain to us the origin of universe?

Evolution is a discontinuous process. Is it correct ?

Give the three key factors of the modern concept of evolution.

Which other term can be used for natural selection ?

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