CBSE Questions for Class 11 Medical Biology Mineral Nutrition Quiz 9 - MCQExams.com

Which one is essential for nitrogen fixation?
  • Copper
  • Zinc
  • Manganese
  • Molybdenum
Deficiency symptons of nitrogen and potassium are visible first in.
  • Young leaves
  • Roots
  • Buds
  • Senescent leaves
Match the identidy the correct option.
III
(a)Zn(i)Bronzing in legume
(b)Cl(ii)Mottled leaf in Citrus
(c)Ni(iii)Whiptail in Cauliflower
(d)Mo(iv)Mouse ear in pecan/ hickory
  • a-ii, b-i, c-iv, d-iii
  • a-iv, b-i, c-iii, d-ii
  • a-ii, b-iii, c-iv, d-i
  • a-i, b-ii, c-iii, d-iv
Which of the following gene is responsible for biological nitrogen-fixation?
  • Nitrogenase
  • Nif gene
  • RNA synthetase
  • Yeast alanine tRNA synthetase
There is no direct transfer of electron from cyt b to cyt c as
  • Energy is not available
  • The two are not nearby
  • Electrons are transported in pairs
  • Electrons have no affinity for cytochromes
Minerals that activate respiratory enzymes
  • N and P
  • Mg and Mn
  • K and Ca
  • S and Fe
  • Cu and Bo
Every mineral element that is present in a cell is needed by the cell .
  • True
  • False
In plants, micronutrients are those which are needed less than or equal to the ................ amount per gram of dry matter.
  • 0.1 mg
  • 0.1 g
  • $$0.1 \mu g$$
  • $$1.0 \mu g$$
Oil yielding legume is
  • Carthamus
  • Glycine max
  • Ricinus
  • Vigna sinensis
If all the microorganisms are destroyed on earth then
  • The earth will be covered by dead bodies
  • We cannot produce antibodies
  • All life form will become immortal
  • Soil will be depleted from nitrogen
Root nodules for nitrogen fixation of a non-leguminous tree possess
  • Frankia
  • Rhizobium
  • Azotobacter
  • Thiobacillus
A legume having a symbiotic association with both of the nitrogen-fixing bacteria Rhizobium and Azorhizobium  is?
  • Crotalaria juncea
  • Sesbania aculeata
  • Sesbania rostrata
  • Cyamopsis tetragonoloba
Leguminous plants are able to fix atmospheric nitrogen through symbiotic activity. Which is not correct?
  • Leghaemoglobin scavenges oxygen and is pinkish in colour.
  • Nitrogenase is insensitive to oxygen.
  • Nodules act as sites for nitrogen fixation.
  • The enzyme nitrogenase catalyses the conversion of atmospheric nitrogen to ammonia.
Which one is a symbiotic nitrogen fixing plant?
  • Pinus
  • Azolla
  • Marchantia
  • Moss
The chemical fertilizer required for better rhizobial nitrogen fixation is ______. 
  • Phosphorus
  • Potassium
  • Calcium
  • Sodium
How does the nitrogen fixation occur in legumes?
  • By specialized bacteria in their roots
  • By specialized bacteria in their leaves
  • Independent of bacteria that live in them
  • Not by any of the above methods
Nitrogen fixation is the conversion of 
  • Nitrogen $$\rightarrow$$ Ammonia
  • Nitrogen $$\rightarrow$$ Nitrates
  • Nitrogen $$\rightarrow$$ Amino acids
  • Both A and B
Azotobacter and Bacillus polymyxa are
  • Decomposers
  • Non-symbiotic nitrogen fixers
  • Symbiotic nitrogen fixers
  • Pathogenic bacteria
Which of the following is correct?
  • Legumes fix nitrogen through bacteria in their leaves.
  • Legumes fix nitrogen through bacteria in their roots.
  • Legumes fix nitrogen independent of bacteria.
  • Legumes do not fix nitrogen.
Which of the following is not considered as the criterion for essentiality?
  • The element must be directly involved in the metabolism of plant.
  • The element must be absolutely necessary for supporting normal growth and reproduction.
  • The requirement of the element may be specific and not replaceable by another element.
  • In the absence of the element, the plant does not complete a specific function.
Example of an ammonifying bacteria is 
  • Clostridium
  • Azotobacter
  • Nitrosococcus
  • Bacillus ramosus
Which of the following does not possess Rhizobium containing nodules?
  • Pisum
  • Cicer
  • Phaseolus
  • Pinus
When we boil tulsi leaves in water, water acquires a characteristic smell of leaves because
  • Smell of leaves diffuse in water
  • Leaves melt in water
  • Stored wastes in the leaves dissolve in water
  • Leaves pollute water
Nitrogen fixation is
  • Nitrogen $$\rightarrow$$ Ammonia
  • Nitrogen $$\rightarrow$$ Nitrates
  • Nitrogen $$\rightarrow$$ Amino acid
  • Both A and B
Find out the odd one in nitrogen cycle
  • Pseudomonas
  • Clostridium
  • Nostoc
  • Rhizobium
An association which fixes nitrogen through non-nodulation is
  • Maize roots with Spirillium notatum
  • Digitaria roots with Spirillium notatium
  • Coralloid roots of Cycas with Anabaena
  • All the above
What is the role of pseudomonas in nitrogen cycle?
  • Fixes elemental nitrogen
  • Produces elemental nitrogen
  • Transfers nitrogen
  • Changes ammonium nitrogen to nitrate state
Old leguminous roots turn green due to
  • Conversion of leghaemoglobin to chl a
  • Breakdown of leghaemoglobin
  • Conversion of leghaemoglobin to chl b
  • Conversion of leghaemoglobin to chl c
Which is wrongly matched?
  • Rhizobium - Free living nitrogen fixer
  • Humus - Abiotic component
  • Phosphorous cycle - Sedimentary
  • Cedrus deodara - Coniferous forest
  • Shorea robusta - Tropical deciduous forest
Which one of the following bacteria reduces nitrate to gaseous nitrogen?
  • Azospirillum
  • Nitrosomonas
  • Nitrococcus
  • Pseudomonas
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