Multiple Choice Questions

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Hydroponics is

  • nutrient less culture

  • water less culture

  • soilless culture

  • none of these


C.

soilless culture

Hydroponics is a subset of hydroculture, which is a method of growing plants without soil by using mineral nutrient solutions in a water solvent. It is useful in areas having thin, infertile and dry soils. They conserve water. It can regulate pH optimum for a particular crop, control soil borne pathogens, avoid problems of weeding and obtain consistently better yield.


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Which of the following sugars is not plants?

  • sucrose

  • glucose

  • lactose

  • fructose


Animals take phosphorus from

  • water

  • plants

  • rock

  • soil


Leghaemoglobin helps in

  • imparting colour to floral petals

  • protecting nitrogenase from O2

  • destroying bacteria

  • transport of food in plants


Which one of the following is not a microelement for plants?

  • Cu

  • B

  • Zn

  • Cr


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Which of the following is correct set of micronutrient for plants?

  • Mg, Si, Fe, Cu, Ca

  • Cu, Fe, Zn, B, Mn

  • Mg, Fe, Zn, B, Mn

  • Mo, Zn, Cl, Mg, Ca


The function of leghaemoglobin during biological nitrogen fixation in root nodules of legumes is to

  • convert atmospheric N2 to NH3

  • convert ammonia to nitrite

  • transport oxygen for activity of nitrogenase

  • protect nitrogenase from oxygen


Which among the following is a rootless plant?

  • Nymphaea

  • Sagittaria

  • Ceratophyllum

  • Vallisneria


Assertion : Plants absorb sulphur in the form of sulphate ions.

Reason : Sulphur bacteria are required for the formation of sulphate.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


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In the given diagram A and B represent

  •              A               B
    Mineralisation Demineralisation
  •              A               B
    Ammonification Denitrification
  •              A               B
    Denitrification Ammonification
  •              A               B
    Denitrification Mineralisation

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