CBSE
Multiple Choice QuestionsNecrosis (die-back) ofthe tip of young leaves is caused due to the deficiency of
iron
manganese
zinc
copper
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.
VAM is
symbiotic bacteria
saprophytic bacteria
saprophytic fungi
symbiotic fungi
Nif genes occur in
Rhizobium
Aspergillus
Penicillium
Streptococcus
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
Nitrogenase enzyme is a
magnesium-iron protein
molybdenum-iron protein
iron-copper protein
nickel-iron protein
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
The "Repeating Unit" of glycogen is
fructose
mannose
glucose
galactose
Natural reservoir of phosphorus is
sea water
animal bones
rock
fossils
The first stable product of fixation of atmospheric nitrogen in leguminous plants is
NO2-
ammonia
NO3-
glutamate
