CBSE Questions for Class 11 Medical Biology Mineral Nutrition Quiz 3 - MCQExams.com

The most abundant element present in the plants is
  • Carbon, hydrogen and oxygen
  • Nitrogen, phosphorus and potassium
  • Calcium, magnesium and sulphur
  • Carbon, nitrogen and hydrogen
The number of essential elements required for normal growth of plant is
  • 10
  • 17
  • 20
  • 25
In plant nutrition elements are classified as major or minor depending on
  • Their availability in the soil.
  • Their relative production in the ash obtained after burning the plants.
  • Their relative amounts required by the plants.
  • Their relative importance in plant growth.
Which of the following is not absorbed through soil?
  • Carbon
  • Nitrogen
  • Potassium
  • All of the above
Carbon become available to crop plant in the form of
  • Amino acids
  • Carbonates
  • Carbon dioxide
  • Element carbon
Which of these organisms does not help in $$N_{2}$$ fixation?
  • Anabaena
  • Nostoc
  • Spirogyra
  • Rhizobium
First experiment related to the method of hydroponics was done by
  • Knop
  • Hill
  • Arnon
  • Sachs
The charcoal culture experiment is better than water culture experiment because
  • Plants get support
  • Problem of aeration is removed
  • Charcoal is an inert substance
  • All of the above
Hydroponics is the
  • Growing of aquatic plants.
  • Growing of floating aquatic plants.
  • Growing of plants in sand.
  • Growing of plants in nutrient balanced aqueous medium.
Tracer elements are
  • Micro elements
  • Macro-elements
  • Radio isotopes
  • Vitamins
Red pigment (leghemoglobin), having affinity for oxygen, is present in the roots of
  • Mustard
  • Soyabean
  • Carrot
  • Radish
Nif genes occur in
  • Rhizobium
  • Aspergillus
  • Penicillium
  • Streptococcus
Symbiotic nitrogen fixation in non-leguminous plant is carried out by
  • Azotobacter
  • Bradyrhizobium
  • Clostridium
  • Frankia
Which of the following is considered to be the element between macro and micro nutrients?
  • Iron
  • Nitrogen
  • Phosphorus
  • Manganese
Knot like bodies known as 'nodules' found in the root of groundnut plant are produced by
  • Azospirillum
  • Azotobacter
  • Pseudomonas
  • Rhizobium
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?
  • Leg haemoglobin scavenges oxygen and is pinkish in colour.
  • Nodules act as sites for nitrogen fixation.
  • The enzyme nitogenase catalyses the conversion of atmospheric N$$_{2}$$ to NH$$_{3}$$.
  • Nitrogenase is insensitive to oxygen.
Which of the following is important factor in causing successful infection of root hairs?
  • Soil nature (pH)
  • Light
  • Temperature
  • Air
Which of the following pigments is essential for nitrogen fixation by leguminous plants?
  • Anthocyanin
  • Phycocyanin
  • Phycoerythrin
  • Leghaemoglobin
Which of the following can fix atmospheric nitrogen directly?
  • Pea
  • Brassica
  • Castor
  • Petunia
The enzyme responsible for the reduction of molecular nitrogen to the level of ammonia in leguminous root nodule is
  • Nitrogenase
  • Nitrate reductase
  • Nitrite reductase
  • Hydrogenase
  • Carboxylase
Advantages of hydroponic cultures are that
  • Plants can be grown with controlled nutrients
  • Natural calamities such as floods and drought can be avoided
  • Pest problems can be kept controlled
  • All of the above
The framework elements of the plants are
  • Magnesium, copper and iron
  • Copper, carbon and oxygen
  • Manganese, calcium and nitrogen
  • Carbon, hydrogen and oxygen
Legume plants are important for atmosphere because they
  • Help in NO$$_{2}$$ fixation.
  • Do not help in NO$$_{2}$$ fixation.
  • Increase soil fertility.
  • All of the above.
Crop plants absorb carbon in the form of
  • Elemental carbon from the soil
  • $$CO_2$$ from the soil
  • $$CO_2$$ from the atmosphere
  • Carbonates
The haemoglobin like pigment is found in
  • Seeds of legumes
  • Clostridium
  • Rhizobium
  • Leguminous root nodules
A free-living nitrogen-fixing cyanobacterium which can also form a symbiotic association with water fern Azolla is

  • Nostoc
  • Anabaena
  • Tolypothrix
  • Chlorella
Cultivation of plants by placing the roots in the nutrient solution is called as
  • Geoponics
  • Hydroponics
  • Aeroponics
  • None of the above
The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is:-
  • Quinone
  • Cytochrome
  • Iron-sulphur protein
  • Ferredoxin
Nostoc is found in symbiotic relationship with
  • Bacteria
  • Virus
  • Anthoceros
  • Azolla
The first stable product of fixation of atmospheric nitrogen in leguminous plants is
  • Ammonia
  • $$NO_3^-$$
  • Gluatamate
  • $$NO_2^-$$
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