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Name five varieties of vegetables which have been produced from 'wild cabbage' by the process of artificial selection.

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Broccoli, cabbage, cauliflower, kohlrabi and kale are the varieties of vegetables, which have been produced from .wild cabbage. by the process of artificial selection.
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Explain evolution from wild cabbage using the artificial selection.

How and which different varieties of cabbage are developed from the wild variety of cabbage by the farmers?

Broccoli has been developed from …………………………….. by artificial selection.

The shells of crabs found around a particular coastal location in Japan seem mostly to resemble the legendary face of a Samurai. Given below are two explanations of this observed fact. Which of these strikes you as a scientific explanation ? (a) A tragic sea accident several centuries ago drowned a young Samurai. As a tribute to his bravery, nature through its inscrutable ways immortalised his face by imprinting it on the crab shells in that area. (b) After the sea tragedy, fishermen in that area, in a gesture of honour to their dead hero, let free any crab shell caught by them which accidentally had a shape resembling the face of a Samurai. Consequently, the particular shape of the crab shell survived longer and therefore in course of time the shape was genetically propagated. This is an example of evolution by artificial selection. [Note : This interesting illustration taken from Carl Sagan's The Cosmos' highlights the fact that often strange and inexplicable facts which on the first sight appear 'supernatural' actually turn out to have simple scientific explanations. Try to think out other examples of this kind).

The optical properties of a medium are governed by the relative permitivity (epsi_(r)) and relative permeability (mu_(r)) . The refractive index is defined as sqrt(mu_(r)epsi_(r))=n . For ordinary material epsi_(r)gt0 and mu_(r)gt0 and the positive sign is taken for the square root. In 1964, a Russian scientist V. Veselago postulated the existence of material with epsi_(r)lt0andmu_(r)lt0 . Since then such 'metamaterials' have been produced in the laboratories and their optical properties studied. For such materials n=-sqrt(mu_(r)epsi_(r)) . As light enters a medium of such refractive index the phases travel away from the direction of propagation. (i) According to the description above show that if rays of light enter such a medium from air (refractive index = 1) at an angle theta in 2^(nd) quadrant, then the refracted beam is in the 3^(rd) quadrant. (ii) Prove that Snell's law holds for such a medium.

In previous question if the particles started from rest and all are positively charge which particles must have been acted upon by a force other than that produced by the electric field.

Name the diagrams a, b and c and from which part of the wild cabbage are they obtained ? Which method is used for obtaining these ?

KUMAR PRAKASHAN-HEREDITY AND EVOLUTION-OBJECTIVE QUESTIONS AND ANSWERS
  1. How you can say that some animals rely entirely on environmental cues ...

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  2. Name two organisms which are now extinct and are studied from their fo...

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  3. Name five varieties of vegetables which have been produced from 'wild ...

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  4. Name the ancestor of the following : Broccoli, Kohlrabi, Kale

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  5. Choose the one term from the following, which includes the other three...

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  6. Whether pea plant is a self - pollinated plant or a cross pollinated o...

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  7. Give the name of the flatworm which was the first to possess the eyes....

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  8. State the probability of birth of offspring as a son or a daughter.

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  9. How do X and Y chromosomes differ ?

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  10. Which character indicates that the birds are closely related to Dinosa...

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  11. Which evidences in the field of biology are considered to be the ancie...

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  12. How do we know that extinct species ever existed ?

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  13. For what purpose is the study of fossils important ?

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  14. Give an example of homologous and analogous organs using same animals.

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  15. Evidences from which types of organs do not suggest any common ancesto...

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  16. Do all variations in a species have equal chances of surviving in the ...

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  17. Who forms the basis for evolutionary processes ?

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  18. What is earlobe ? Which are dominant and recessive variants respective...

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  19. According to Mendel's experiment, the tall plants in F(1) generation w...

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  20. How do germ cells make a single set of genes from the normal two copie...

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