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Differentiate between the two cells encl...

Differentiate between the two cells enclosed in a mature male gametophyte of an angiosperm.

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XII BOARD PREVIOUS YEAR PAPER ENGLISH-XII BOARDS-Section B
  1. In a typical monohybrid cross the F(2)-population ratio is written as ...

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  2. Mention the contribution of S.L. Miller's experiments on Origin of Lif...

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  3. Alien species are a threat to native species. Justify taking example o...

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  4. Differentiate between the two cells enclosed in a mature male gametop...

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  5. Work out a cross to find the genotype of a tall pea plant. Name the ty...

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  6. Why do algae and fungi shift to sexual mode of reproduction just befor...

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  7. A cross was carried out between two pea plants showing the contrasting...

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  8. How does the gene 'I' control ABO blood groups in humans? Write the ef...

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  9. Write the types of sex-determination mechanisms the following crosses ...

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  10. i) Name the scientist who suggested that the genetic code should be ma...

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  11. State the disadvantage of inbreeding among cattle. How it can be overc...

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  12. Explain with the help of a suitable exmaple, the naming of a restricti...

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  13. Construct an age pyramid which reflects a stable growth status of huma...

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  14. Apart from being part of the food chain, predators play other importan...

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  15. How are 'sticky ends' formed on a DNA strand? Why are they so called ?

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  16. i)Name the scientist who suggested that the genetic code should be mad...

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  17. What is gene therapy? Name the first clinical case where it was used.

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  18. Why does the Bt toxin not kill the bacterium that produces it but kill...

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  19. Identify the following pairs of Homologous or Analogous organs: i) S...

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  20. List the post-fertilization events in angiosperms.

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