Which one of the following gas was not present in free form at the time life originated on earth?

  • A

    Ammonia

  • B

    Oxygen

  • C

    Hydrogen

  • D

    Methane

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The most thoroughly studied of the known bacteria plant interactions is the

  • [AIPMT 2004]

Match the following by using codes:

$A.$ Vernalization                         -          $1. $ Camerarius

$B.$ Double fertilization                -          $2.$  Hofmeister

$C.$ Pollination                             -          $3. $ Lysenko

$D.$ Alternation of Generations    -          $4. $ Nawaschin

The scientist related with the over throw or the "Theory of spontaneous generation'' and experiments with swan-necked flasks is

Assertion : From evolutionary point of view, human gestation period is believed to be shortening.

Reason : One major evolutionary trend in humans has been the larger head undergoing relatively faster growth rate in the foetal stage.

  • [AIIMS 2004]

Coacervates are