Biology Class 12 NCERT Solutions: Chapter 7 Evolution Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Q5 Find out through internet and popular science articles whether animals other than man have self-consciousness.

Answer:

  • There are many animals other than humans, which have self-consciousness. An example of an animal being self-conscious is dolphins.
  • They are highly intelligent. They have a sense of self and they also recognize others among themselves and others.
  • They communicate with each other by whistles, tail-slapping and other body movements. Not only dolphins, there are certain other animals such as crow, parrot, chimpanzee, gorilla, orangutan, etc. , which exhibit self-consciousness.

Q. 6 List modern-day animals and using the internet resources link it to a corresponding ancient fossil. Name both.

Answer 6:

  • The modern day animals and their ancient fossils are listed in the following table.
Table of Animals and Ancient Fossils
AnimalFossil
1.ManRamapithe cus
2.HorseEohippus
3.DogLeptocyon
4.CamelProtylopus
5.ElephantMoerithers
6.WhaleProtocetus
7.FishArandaspis
8.TetrapodsIcthyostega
9.BatArchaeonycteris
10.GiraffePalaeotragus

Q. 7 Practise drawing various animals and plants.

Answer:

  • Ask your teachers and parents to suggest the names of plants and animals and practice drawing them.
  • You can also take help from your book to find the names of plants and animals.

Q. 8 Describe one example of adaptive radiation.

Answer:

  • Adaptive radiation is an evolutionary process that produces new species from a single, rapidly diversifying lineage. This process occurs due to natural selection.
  • An example of adaptive radiation is Darwin finches, found in Galapagos Island. A large variety of finches is present in Galapagos Island that arose from a single species, which reached this land accidentally.
  • As a result, many new species have evolved, diverged, and adapted to occupy new habitats. These finches have developed different eating habits and different types of beaks to suit their feeding habits.
  • The insectivorous, blood sucking, and other species of finches with varied dietary habits have evolved from a single seed eating finch ancestor.
Adaptive Radiation

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