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.

62.

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

Natural reservoir of phosphorus is

• sea water

• animal bones

• rock

• fossils

Nitrogenase enzyme is a

• magnesium-iron protein

• molybdenum-iron protein

• iron-copper protein

• nickel-iron protein

Necrosis (die-back) ofthe tip of young leaves is caused due to the deficiency of

• iron

• manganese

• zinc

• copper

Read the following deficiency symptoms of micronutrients in plants.

I. Loosening of inflorescence in Cauliflower.

II. Apical necrosis of young leaves (reclamation disease).

III. Bronze colour in leaves

IV. Upper half a lamina falls down (whiptail disease)

V. Legume cotyledons with brownish spots (marsh spot disease)

Pick out the symptoms caused by the deficiency of molybdenium and choose the correct option.

• II, IV and V

• I, III and IV

• III and II

• I and IV

Which of the following is correctly matched for the deficiency symptom produced by them?

• Molybdenum - Disturbance in iron metabolism

• Sodium - Interfere with healthy growth of nails and hair

• Protein - Convulsions and hallucinations

• Riboflavin - Beri beri