If an agricultural field is liberally irrigated for a prolonged period of time, it is likely to face problem of

  • [NEET 2019]
  • A

    Metal toxicity

  • B

    Alkalinity

  • C

    Acidity

  • D

    Salinity

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Definitions / Explanation :

$(i)$ Sere

$(ii)$ Standing state

Estuaries occur in

The two vegetation of ecosystem are separated by

Alpine forests occur at altitude

Plants capture only....... percent of the $PAR.$