Hydroponics is

• nutrient less culture

• water less culture

• soilless culture

• none of these

Leghaemoglobin helps in

• imparting colour to floral petals

• protecting nitrogenase from O₂

• destroying bacteria

• transport of food in plants

153.

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

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

Assertion: Nitrogen-fixing bacteria in legume root nodules survive in oxygen-depleted cells of nodules.

Reason: Legheamoglobin completely removes oxygen from the nodule cells.

• 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.

Nif genes occur in

• Rhizobium 

• Aspergillus

• Penicillium

• Streptococcus

The "Repeating Unit" of glycogen is

• fructose

• mannose

• glucose

• galactose

VAM is

• symbiotic bacteria

• saprophytic bacteria

• saprophytic fungi

• symbiotic fungi

The first stable product of fixation of atmospheric nitrogen in leguminous plants is

• NO₂^-

• ammonia

• NO₃^-

• glutamate