CBSE Questions for Class 11 Medical Biology Mineral Nutrition Quiz 4 - MCQExams.com

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiont nitrogen fixation. Which one of the following statements is not correct about this process?
  • Leghaemoglobin scavenges oxygen and is pinkish in colour
  • Nodules act as sites for nitrogen fixation
  • The enzymes, nitrogenase catalyses conversion of atmospheric $$N_2$$ to $$NH_3$$
  • Nitrogenase is insensitive to oxygen
The major portion of the dry weight of plant comprises of
  • Nitrogen, phosphorus and potassium
  • Calcium, magnesium and sulphur
  • Carbon, nitrogen and hydrogen
  • Carbon, hydrogen and oxygen
If by radiation, all nitrogenase enzymes are inactivated, then there will be no
  • Fixation of nitrogen in legumes
  • Conversion from ammonia to nitrate in soil
  • Conversion from nitrate to nitrite in legumes
  • None of the above
Which of the following does not fix atmospheric nitrogen?
  • Nostoc
  • Anabaena
  • Spirogyra
  • Azotobacter
Which phenomenon is exhibited by the figure above?

155946_9285f15de6f14773a030edb5159bd0c1.png
  • A- Hydroponic
  • A- Hydrostatic
  • A- Just a plant in a tub
  • A-Soil
What are applications of this system?

155949_ce2f18dc8a02431794a2671dbf1a0d83.png
  • Hydroponics
  • Hydrostatic
  • Both A and B
  • None of the above
What is labelled as A and what is the pH of media A?

155947_c112c6682ea347209dd355c67ae65cf9.png
  • Nutrient solutions with essential minerals with pH 5
  • Nutrient solutions with essential minerals with pH 6
  • Water with essential minerals with pH 7
  • Water with pH 7
Unicellular symbiotic organisms that improve the yield of legumes by
  • Fixing nitrogen without colonizing roots of host
  • Fixing atmospheric nitrogen and colonizing roots of host
  • Inducing the host plant to absorb more phosphorous
  • Stimulating the host plant to become tolerant to drought
VAM is seen in
  • Pea
  • Oak
  • Peach
  • Grasses
Nitrogen fixation by Rhizobium is increased in the presence of
  • Potassium
  • Nitrogen
  • Phosphorus
  • None of the above
Which of the following plants have red pigment in their roots?
  • Radish
  • Mustard
  • Soybean
  • Maize
The major chunk of nitrogen in nature is fixed by
  • Lightning
  • Symbiotic bacteria
  • Denitrifying bacteria
  • Chemical industries
Which of the following organism derives energy for $${ N }_{ 2 }$$ fixation by performing photosynthesis?
  • Anabaena
  • Azotobactor
  • Rhizobium
  • Bacillus
Doctors recommend sunflower oil as it is 
  • Rich source of vitamins
  • Rich in energy and reduces weight
  • Rich in saturated fatty acids
  • Rich in unsaturated fatty acids
Which of the following is a free living nitrogen fixing bacteria?
  • Pseudomonas putida
  • Bacillus polymyxa
  • Rhizobium
  • Xanthomonas
Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?
  • Crotalaria juncea
  • Cycas revoluta
  • Cicer arietinum
  • Casuarina equisetifolia
One of the following elements, which is not much important to plants is?
  • Ca
  • Zn
  • I
  • Na
If by radiation all nitrogenase enzyme are inactivated, then there will be no
  • None of the above.
  • Conversion from ammonium to nitrate in soil.
  • Fixation of nitrogen by legumes.
  • Conversion from nitrate to nitrite in legumes.
India produces the maximum amount of
  • Potato
  • Sweet Potato
  • Tea
  • Corn
Which of the following bacteria has potential for nitrogen fixation?
  • Nitrosomonas
  • Nitrobacter
  • Nitrosococcus
  • Rhizobium
Which of the following is a nitrogen fixing organism?
  • Aspergillus
  • Rhizobium
  • Both A and B
  • None of the above
Anabaena is associated with Azolla's
  • Stem
  • Leaves
  • Roots
  • Flowers
Non-symbiotic $$N_{2}$$ fixer is 
  • Anabaena
  • Rhizobium
  • Azotobacter
  • Azolla
The plant ash is an indication of
  • Organic matter of plant
  • Waste product
  • Mineral salts absorbed by plants
  • None of the above
Root nodules which are present in plants are meant for fertilizers and are found in
  • Certain leguminous plants
  • Casuarina
  • Both A and B
  • None of the above
The bulk of nitrogen in nature is fixed by 
  • Lighting
  • Chemical industries
  • Denitrifying bacteria
  • Symbiotic bacteria
Which of the following is symbiotic bacteria?
  • Rhizobium
  • Azotobactor
  • Closridium
  • Streptomyces
What will happen, if Rhizobium is inoculated in wheat field?
  • No increase in production (nitrogen content of soil remains same)
  • A lot of increase in production (nitrogen content of soil increase)
  • Fertility of soil decreases
  • Fertility of soil increases
Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statement is not correct during this process of nitrogen fixation?
  • Nodules act as sites for nitrogen fixation.
  • The enzyme nitrogense catalyses the conversion of atmospheric $$N_2$$ to $$NH_3$$.
  • Nitrogenase is insensitive to oxygen.
  • Leghaemoglobin scavenges oxygen and is pinkish in colour.
Hydroponics is a technique in which plants are grown in a ?
  • Green house
  • Water saturated sand
  • Balanced nutrient solution
  • Purified distilled water
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