Benthic organisms are affected the most by

  • [NEET 2013]
  • A

    light reaching the forest floor

  • B

    surface turbulence of water

  • C

    sediment characteristics of aquatic ecosystems

  • D

    water­holding capacity of soil.

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Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to

  • [NEET 2014]

If there was no $CO_2$ in the earth’s atmosphere, the temperature of earth’s surface would be

  • [AIPMT 1998]

Most living organisms cannot survive at temperature above $45\,^{\circ} \mathrm{C}$ . How are some microbes able to live in habitats with temperatures exceeding $100\,^{\circ} \mathrm{C} ?$