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Name the layer of the atmosphere that is...

Name the layer of the atmosphere that is associated with 'good ozone'.
OR
Mention the term used to describe a population interaction between an orchid growing on a forest tree.

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Stratosphere is the layer of atmosphere associated with good ozone.
OR
Orchid growing on a forest tree is called commensalism. It is an interaction where one organism is benefitted and other organism is not harmed.
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XII BOARDS PREVIOUS YEAR-XII BOARDS-SECTION-A
  1. Pea flowers produce assured seed sets. Give a reason.

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  2. British geneticist R.C. Punnett developed a graphical representation o...

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  3. State the two principal outcomes of the experiments conducted by Louis...

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  4. Name the layer of the atmosphere that is associated with 'good ozone'....

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  5. What are 'flocs', formed during secondary treatment of sewage ? OR ...

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  6. At what stage does the meiosis occur in an organism exhibiting haploid...

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  7. Mention two objectives of-setting up GEAC by our Government.

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  8. What are transgenic animals. Give an example.

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  9. Write the palindromic sequence that EcoRI recognises.

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  10. Trace the route of Sporozoite of Plasmodium when it enters the human b...

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  11. List any two characters of Pea plants used by Mendal in his experiment...

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  12. Name the disorder caused due to the absence of one of the X-chromosome...

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  13. Write one difference between binary fission and budding.

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  14. Mention two objectives of-setting up GEAC by our Government.

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  15. What are transgenic animals. Give an example.

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  16. Write the palindromic sequence that EcoRI recognises.

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  17. Trace the route of Sporozoite of Plasmodium when it enters the human b...

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  18. List any two characters of Pea plants used by Mendal in his experiment...

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  19. Name the disorder caused due to the absence of one of the X-chromosome...

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  20. Write one difference between binary fission and budding.

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