Leghaemoglobin helps in

• imparting colour to floral petals

• protecting nitrogenase from O₂

• destroying bacteria

• transport of food in plants

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

Which of the following sugars is not plants?

• sucrose

• glucose

• lactose

• fructose

Hydroponics is

• nutrient less culture

• water less culture

• soilless culture

• none of these

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

• Cu

• B

• Zn

• Cr

Animals take phosphorus from

• water

• plants

• rock

• soil

In the given diagram A and B represent

• A	B
  Mineralisation	Demineralisation

• A	B
  Ammonification	Denitrification

• A	B
  Denitrification	Ammonification

• A	B
  Denitrification	Mineralisation

Which among the following is a rootless plant?

• Nymphaea

• Sagittaria

• Ceratophyllum

• Vallisneria

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 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