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Which of the following is / are not a na...

Which of the following is / are not a natural ecosystem? 

A

Forest ecosystem

B

Rice field

C

Grassland ecosystem

D

Desert ecosystem

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Knowledge Check

  • Which of the following is Not a natural contraceptive?

    A
    (a) Rhythm method
    B
    (b) Lactational amenorrhoea
    C
    (c) Progestasert
    D
    (d) Continuous abstinence

  • Which one of the following is a natural rubber?

    A
    Buna-S
    B
    Buna-N
    C
    cis-1,4-poly isoprene
    D
    neoprene

  • Which of the following is paramagnetic in nature?

    A
    `[Zn(NH_(3))_(4)]^(2+)`
    B
    `[Co(NH_(3))_(6)]^(3+)`
    C
    `[Ni(H_(2)O)_(6)]^(2+)`
    D
    `[Ni(CN)_(4)]^(2-)`

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