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Discuss one example, based on your day-to-day observations, showing how loss of one species may lead to the extinction of another.

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Co-extinction is the extiction of two mutually related or interelated specials for instance a host fish extinction leads to the extinction of all those parasites exclusively found on it. Another example is plant pollinator mutualism, where extinction of one leads to the extinction of other.
Insect, aphids are polyphagous (feed on more than one plant species) or monophagous (feed on a particular species of plant). Monophagous insects may becomes extinct, if the plant species upon which they feed becomes extinct.
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The Director of the institute XYZ has announced that six guest lecturers on different areas like Leadership, Decision Making, Quality centre, Motivation, Assessment centre and Group Discussions are to be organised only one on each day from Monday to Sunday. (i) Motivation should be organised immediately after Assessment centre. (ii) Quality centre should be organised on Wednesday and should not be followed by Group Discussion. (iii) Decision Making should be organised on Friday and there should be a gap of two days between Leadership and Group Discussion (iv) One day there will be no lecture(Saturday is not that day), just before that day Group Discussion will be organised. On which day there is no lecture ?

The Director of the institute XYZ has announced that six guest lecturers on different areas like Leadership, Decision Making, Quality centre, Motivation, Assessment centre and Group Discussions are to be organised only one on each day from Monday to Sunday. (i) Motivation should be organised immediately after Assessment centre. (ii) Quality centre should be organised on Wednesday and should not be followed by Group Discussion. (iii) Decision Making should be organised on Friday and there should be a gap of two days between Leadership and Group Discussion (iv) One day there will be no lecture(Saturday is not that day), just before that day Group Discussion will be organised. Which of the following information is not required for the above arrangements ?

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NCERT EXEMPLAR-BIODIVERSITY AND CONSERVATION-Biodiversity And Conservation
  1. How is the presently occuring species extinction different from the ea...

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  2. Of the four major causes for the loss of biodiversity (Alien species ...

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  3. Discuss one example, based on your day-to-day observations, showing ho...

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  4. A species area curve is drawn by plotting the number of species agains...

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  5. Is it possible that productivity and diversity of a natural community ...

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  6. There is greater biodiversity in tropical/subtropical regions than in ...

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  7. Why are the conventional methods not suitable for the assessment of bi...

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  8. What criteria should one use in categorising a species as threatened ?

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  9. What could be the possible explanation for greater vulnerability of am...

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  10. How do scientists extrapolate the total number of species on earth ?

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  11. Humans benefit from diversity of life. Give two examples.

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  12. List any two major causes other than anthropogenic causes of the loss ...

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  13. What is an endangered species ? Give an example of an endangered plant...

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  14. What are sacred groves and their role in biodiversity conservation ?

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  15. Suggest a place whre one can go to study coral reefs, mangrove vegetat...

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  16. Is it true that there is more solar energy available in the tropics ? ...

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  17. What is co-extinction ? Explain with a suitable example ?

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  18. Elaborate how invasion by an alien species reduces the species diversi...

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  19. How can you, as an individual, prevent the loss of biodiversity ?

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  20. Can you think of a scientific explanation, besides analogy used by Pau...

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