Please refer to Chapter 12 Mineral Nutrition MCQ Class 11 Biology with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 11 Biology. Students should refer to MCQ Questions for Class 11 Biology with Answers to score more marks in Grade 11 Biology exams. Students should read the chapter Mineral Nutrition and then attempt the following objective questions.

MCQ Questions Class 11 Biology Chapter 12 Mineral Nutrition

The Mineral Nutrition MCQ Class 11 Biology provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. Who among the following presented the theory of essential mineral nutrients in plants?
A. Carl Linnaeus
B. Aristotle
C. Arnon and Stout
D. Leonhart Fuchs

Question. Which one of the following discovered nitrogen-fixing bacteria?
A. Pasteur
B. Lister
C. Winogradsky
D. Koch

Question. The product(s. of the reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are.
A. Nitrate alone
B. Ammonia and oxygen
C. Ammonia and hydrogen
D. Ammonia alone

Question. Which of the following elements helps in maintaining the structure of ribosomes?
A. Magnesium
B. Zinc
C. Copper
D. Molybdenum

Question. What is the function of leg-haemoglobin in root nodules of legumes?
A. they act as a catalyst during transamination
B. it carries oxygen to root nodules
C. it acts as a scavenger of oxygen
D. they provides energy to nitrogen-fixing bacteria

criteria for essentiality of an element for a plant include all except:
A. It must be absolutely necessary for supporting normal growth and reproduction
B. The requirement must be specific and not replaceable by another element
C. It must be directly involved in the metabolism of the plant.
D. They must be present in the plants in a concentration in excess of 10 mmole/Kg of dry matter.

Question. How many ATP molecules are required to biologically fix one molecule of nitrogen into two molecules of ammonia?
A. D
B. 8
C. 12
D. 16

Question. During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by
A. leghaemoglobin
B. xanthophyll
C. carotene
D. cytochrome

Question. Which of the following macronutrients does not form components of fertiliser?
A.  N,P
B.  P,S
C.  K,S
D.  S,Zn

Question. Ammonia is first oxidized to nitrite by the bacteria except
A. Nitrosomonas
B. Nitrococcus
C. Nitrobacter
D. All of these

Question. Deficiency symptoms of nitrogen and potassium are visible first in
A. senescent leaves
B. young leaves
C. roots
D. buds

Question. Which one of the following is not a micronutrient?
A. Molybdenum
B. Magnesium
C. Zinc
D. Boron

Question. About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and:
A. phosphorus and sulphur
B. sulphur and magnesium
C. magnesium and sodium
D. calcium and phosphorus

Question. The function of leghaemoglobin is
A. to provide oxygen to leg muscles of nitrogen-fixing
B. to protect oxygen-sensitive enzymes of nitrogen fixing bacteria in the root nodules of legumes
C. to walk to the sites where oxygen is required
D. to function when haemoglobin is not available.

Question. Hydroponics is
A. cultivation of plants in water
B. growth of plants towards water
C. growth of plants away from water
D. soilless cultivation of plants

Question. Leghaemoglobin is produced in response to
A. respiration
B. photosynthesis
C. fatty acid synthesis
D. NB fixation.

Question. Hydroponics can be used in
A. Identification of essential elements
B. In discovery of deficiency symptoms of essential elements
C. For commercial production of vegetables
D. All of these

Question. Which of the following is the essential requirement of Hydroponics?
A. Aeration to obtain the optimum growth
B. Lage vessel
C. Broader neck
D. Cotton plugs for funnel adjustment

Question. Which of the following is not a Macronutrient?
A. C
B. Mg
C. Ca
D. Fe

Question. The Which of the following Macronutrient is absorbed from soil as mineral nutrition?
A. P
B. C
C. H
D. O

Question. A nitrogen fixing microbe associated with Azolla in rice fields is
A. Spirulina
B. Anabaena
C. Frankia
D. Tolypothrix

Question. An element playing important role in nitrogen fixation is
A. molybdenum
B. copper
C. manganese
D. zinc

Question.The total essential elements for plant are
A. B0
B. A7
C. BD
D. A5

Question. Which of the following is not a component of biomolecule is not contribute in structural elements of cell?
A. C
B. O
C. N
D. Mg

Question. Alcohol Dehydrogenase needs which of the following ion for activation?
A. Zn++
B. Mo
C. Cr
D. Mg++

Question. Which of the following form is absorbed for the requirement of Phosporus?
A. Dihydrogen Phosphate, Hydrogen phosphate
B. Phosphoric Acid
C. Phosphorite
D. Phosphic Acid

Question. Which of the following has both Fe and Mg?
A. For the formation of Ferredoxin
B. For the formation of Chlorophyll
C. For the formation of Ribosome
D. For the formation of Nucleotide

Question. I. Regulation of metabolic activities
II. Activation of certain enzymes
III. Involved in normal functioning of the cell wall and required for the formation of mitotic spindle.
Which of the following ion is best suitable for it?
A. Ca++
B. K+
C. Zn++
D. Cl-

Question. The amino acid or acids which does or do not have Sulphur?
A. Cysteine
B. Methionine
C. Serine
D. Both B and C

Question. Manganese functions in
A. Splitting of water to liberate oxygen
B. Transfer of electrones through z scheme
C. Cyclic Phosphorespiration
D. Photorespiration

Question. Which of the following is not involved in redox reactions?
A. Cu++
B. Fe++
C. Cu+
D. Cl-

Question. Which of the following is not involved in water splitting reaction of photosynthesis?
A. Cl-
B. Mn++
C. Cu
D. Both A and C

Question. The deficiency symptoms of mobilizable substances appear first in Older parts because
A. In order to mobilize the elements to young part, the biomolecules of older parts are broken down
B. In order to mobilize the elements the older part becomes weaker
C. The work of mobilization is random and takes a lot of energy to cause it
D. All of these

Question. Why does S and Ca deficiency not found in older parts first?
A. As they are immobilizable
B. As they are very abundant in older parts
C. As newer parts are already deficient
D. Both A and B

Question. Which of the following elements does not cause both an inhibition of cell division and delay in flowering if their concentration in plants is low?
A. N
B. K
C. S
D. Mo

Question. Which of the following is not true about soil?
P. Soil not only supplies minerals but also harbours nitrogen fixing bacteria and other microbes
Q. It holds water
R. It supplies air to the roots
S. It acts as a matrix that stabilises the plant
T. It is a source of photosynthate
U. It is positively geotropic without any exception
A. S, T and U
B. T and U
C. S and U
D. R and T

Question. The movement of ions is usually called
A. Pressure Flow
B. Flux
C. Diffusion
D. Osmosis

Question. Plants absorb which form of Nitrogen?
A. Ammonia
B. Nitrate
C. Nitrite
D. Nitrogen

Question. Nitrogenase converts
A. Nitrate to Nitrite
B. Nitrogen to Ammonia
C. Nitrogen to Nitrite
D. Nitrogen to Nitrate

Question. Which of the following is free living nitrogen fixing cyanobacteria?
A. Anabaena
B. Azotobacter
C. Beijernickia
D. Rhodospirillum

Question. In which of the following forms is iron absorbed by plants?
A. Ferric
B. Ferrous
C. Free element
D. Both ferric and ferrous

Question. During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by
A. Leghaemoglobin
B. Xanthophylls
C. Carotene
D. Cytochrome

Question. Which of the following does not happen during nodule formation?
A. Rhizobium bacteria contact a susceptible root hair, divide near it
B. Successful infection of root hair causes it to curl
C. Infected thread carries the bacteria to the inner cortex
D. The bacteria get modified into rod shaped bacteroides and cause inner cortical and endodermal cells to divide

Question. The nitrogen fixing bacteria are
A. Always free living
B. Generally free living aerobes but during nitrogen fixing event it becomes anaerobic
C. Always anaerobic
D. Generally anaerobic but under nitrogen fixing event, it becomes aerobic

Question. Transamination
A. Involves the transfer of amino group from one amino acid to the keto group of keto acid.
B. Involves the transfer of amino group from one amino acid to the amino group of another amino acid
C. Involves the transfer of keto group from one amino acid to the keto group of keto acid
D. Involves the transfer of ke to group of keto acid to the keto group of keto acid

Question. Asparagine is
A. Amide formed by addition of another amino group to glutamate
B. Two amino groups over carboxy group of aspartate
C. One amino group over hydroxy part of aspartic acid
D. All of these

Question. A free living aerobic soil bacterium capable of fixing nitrogen is
A. Azotobacter
B. Clostridium
C. Rhizobium
D. Streptococcus

Question. Cytochrome is 
A. Metallo flavoproteins
B. Fe containing porphyrin pigment
C. Glycoprotein
D. Lipid

Question. During nitrogen fixation, nitrite is oxidized to nitrate with the help of the bacterium:
A. Nitrosomanas
B. Pseudomonas
C. Nitrobacter
D. Thiobacillus

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