CBSE Class 11 Biology Mineral Nutrition MCQs Set C

Question: The process of conversion of NO₃ → NO₂ → NH₃ → N₂
a) Nitrification, Nitrosomonas
b) Denitrification, Pseudomonas
c) Nitrate assimilation, Nitrogenase
d) Ammonification, Bacillus
Answer: b

Question: Asparagine and Glutamine are
a) Amino acids
b) Imino acids
c) Amide
d) Protein
Answer: a

Question: Nodule formation is reduced in the legume roots due to deficiency of
a) S
b) B
c) N
d) S, B
Answer: d

Question: Which one is false?
a) Soil supplies minerals, harbours N₂–fixing bacteria and other microbes, holds water, supplies O₂ to root and acts as matrix that stabilises the plant
b) Both macro and micronutrients form component of fertilizers
c) Weathering and breaking down of rock enrich the soil with dissolved ions and inorganic salts
d) Denitrification is not the job of Pseudomonas and Thiobacillus
Answer: d

Question: Nitrate reductase forms
a) N₂
b) AAs
c) NO₂
d) NO₃
Answer: c

Question: Which of the following represents the abiological mode of adding nitrogen to the soil?
a) Ammonification
b) Nitrification
c) Lightning
d) Nodule formation
Answer: c

Question: Which of the following happens to be the key organism in the nitrogen cycle?
a) All green plants
b) Leguminous plants
c) Bacteria
d) Heterotrophic plants
Answer: b

Question: What is the fate of NH₄⁺ in plant?
a) It is deprotonated
b) It is reprotonated
c) It is oxidatively aminated
d) It is toxic to plants
Answer: c

Question: Leg–haemoglobin is found in which of the following organism?
a) Anthoceros
b) Aulosira
c) Nostoc
d) Groundnut
Answer: d

Question: Cell division in root nodules is promoted by _____ secreted by plant and _____ secreted by bacteria
a) Auxin, Cytokinin
b) Cytokinin, Auxin
c) Auxin, Leg–haemoglobin
d) Nitrogenase, Leg–haemoglobin
Answer: a

Question: The translocation of inorganic solute
a) Is equal to the rate of translocation of water
b) Is dependent on transpiration pull
c) Occurs through xylem vessel
d) All
Answer: d

Question: During ionic flux, the uptake of ions into inner space is
a) Passive process
b) Active process
c) Energy dependent
d) Both Active process and Energy dependent
Answer: d

Question: Corn is a crop that requires a lot of nitrogen to grow properly. Farmers grow corn alternating with legumes because
a) Legumes form mycorrhizal association which can convert atmospheric N₂
b) Legume roots contain bacteria that convert atmospheric nitrogen
c) Legumes are the only plants that can fix atmospheric nitrogen
d) Legumes deplete nitrogen, so corn replenishes it
Answer: b

Question: Most of the plants obtain nitrogen from the soil in the form of
a) Nitrates and nitrites
b) Nitrates and ammonium salt
c) Nitrites and Ammonium salts
d) Hyponitrites and nitrates
Answer: b

Question: The fixation of nitrogen in the root nodules is an
a) Associative symbiosis
b) Obligatory symbiosis
c) Non–symbiotic N₂–fixation
d) Phyllosphere association
Answer: a

Question: The bond in molecular nitrogen (N₂) is difficult to break, because it is a
a) Twisted configuration
b) Quadruple hydrogen bond
c) Triple covalent bond
d) Triple ionic bond
Answer: c

Question: Outer space/free space includes
a) Inter cellular spaces
b) Cell wall
c) Apoplast
d) All
Answer: d

Question: Which is not true for nitrogenase enzyme in root nodules in legumes?
a) Synthesized by nif genes of Rhizobium
b) Site of reduction of N₂ into NH₃
c) It is a Mo–Fe protein
d) Resistant to O₂ concentration
Answer: d

Question: Which one of the following is correct?
a) Azotobacter and Beijerinckia are free-living N₂–fixers
b) Rhodospirillum is anaerobic N₂–fixing bacterium
c) Bacillus is a free-living N₂ fixer
d) All
Answer: d

Question: At physiological pH, for the formation of ammonium ion, Ammonia is
a) Deprotonated
b) Decarboxylated
c) Carboxylated
d) Protonated
Answer: d

Question: Which of the following statement is correct?
a) Amides and ureides are the transported forms of nitrogen as they have more nitrogen
b) Legumes of tropical origin (e.g. soyabean) transport ureides
c) The host plant produces globin part and bacterial symbiont produces haem part of leghaemoglobin (N2– fixing pigment)
d) All
Answer: d

Question: Plants having mutualistic relations with nitrogen–fixing bacteria receive _____ from the bacteria
a) Ammonia
b) Amino acids
c) Nitrite
d) Nitrate
Answer: a

Question: Which one of the following is an amide involved in nitrogen assimilation by plants?
a) Glutamine
b) Alanine
c) Asparagine
d) Both Glutamine and Asparagine
Answer: d

Question: Leg–haemoglobin is
a) O₂ scavenger
b) N₂ scavenger
c) CO₂ scavenger
d) Protein Scavenger
Answer: a

Question: Which is a false statement regarding macronutrients?
a) Form plant structure
b) No role in ETS
c) Develop osmotic potenitial
d) Become toxic in excess
Answer: b

Question: Nitrogen fixation by organisms requires conditions that are
a) Highly alkaline
b) Anaerobic
c) Saturated with sunlight
d) Free of water
Answer: b

Question: Inner space consists of
a) Cytoplasm
b) Vacuole
c) Apoplast, vacuole
d) Cytoplasm and vacuole
Answer: a

Question: Nitrosomonas, Nitrococcus and Nitrobacter are
a) Photoautotroph
b) Chemoheterotrophs
c) Chemoautotroph
d) Decomposers
Answer: c

Question: Reduction of one molecule of nitrogen into 2 molecules of NH3 consumes
a) 4 molecules of ATP
b) 16 molecules of ATP
c) 56 molecules of ATP
d) 38 molecules of ATP
Answer: b

Question: Which one is false about the bacteria Rhizobium and Frankia?
a) Both are N2– fixers
b) Both are free living in soil but can live as symbiotic life with their respective partners.
c) Frankia produces nodules on the roots of non leguminous plants like Alnus while Rhizobium does the same in leguminous plants
d) None
Answer: d

Question: What is the primary controlled variable from which scientists benefit in a hydroponic experiment?
a) Sunlight
b) Insects
c) Size of the plant
d) Nutrient uptake
Answer: d

Question: Any mineral ion conc. in tissues that reduces the dry wt. of tissue by about 10% is considered
a) Toxic
b) Essential minerals
c) Micronutrients
d) Macronutrients
Answer: a

Question: The moderate decrease of micronutrients causes _____ symptoms while a moderate increase causes _____
a) Deficiency,toxicity
b) Toxic,chlorosis
c) Chlorotic, toxic
d) Chlorotic, necrosis
Answer: a

Question: Most plants continue to obtain new sources of mineral nutrients by
a) Breaking down organic matter
b) Growing longer roots
c) Evolving more PS
d) Microbes
Answer: a

Question: Which one is correct summary equation for the nitrogen fixation?
a) N₂⁺ + 8e^– + 8 ATP ––> NH₃ + H₂ + 16ADP + 16Pi
b) N₂⁺ + 8e + 8H⁺ + 16 ATP ––> 2NH₃ + H₂ + 16ADP + 16Pi
c) 2NH₃⁺ + 4O₂ + 2H⁺ ––> 2H₂O + 2NO₃^–
d) 2NH₃⁺ + 3O₂ + 2NO₂^– + 2H+ + 2H₂O
Answer: b

Question: The bond in molecular nitrogen (N2) is difficult to break, because it is a
a) twisted configuration
b) quadruple hydrogen bond
c) triple covalent bond
d) triple ionic bond
Answer: c

Question. Which one is false?
A. Mobile elements – N,P,K,Mg,Zn,Cl
B. Immobile elements – Ca, Fe, S, Mn, B, Cu
C. Deficiency symptoms first appear in older leaves due to deficiency of P,K,N,Zn,Mg Or Cl
D. Deficiency symptoms first appear in young leaves due to deficiency of Ca, Cu, Fe, S, Mn or B
Options :
(a) All are wrong
(b) None
(c) C and D
(d) A and B
Answer: b

Question: The different steps in a nodule formation are given below
A. A matured nodule establishes a direct vascular connection with the host for exchange of nutrients
B. Root hair curls and the bacteria invade the root hair
C. Rhizobium bacteria contact a susceptile root hair, divide near it
D. The infection thread is produced carrying the bacteria and grows into the cortex of the root
E. The bacteria get modified into rod–shaped bacteroids and cause inner cortical layer and pericycle to divide to form nodule
The correct sequence is
(a) C,B,D,A,E
(b) C,B,D,E,A
(c) D,E,C,B,I
(d) I,C,E,B,D
Answer: b

Question: Match correctly between
Column – I                Column – II
A. Zn                        I. Hexokinase, PFK
B. K                         II. Most free ion
C. Cu                      III. Aconitase, peroxidase, catalase
D. Fe                       IV. Tyrosinase
E. Mg                       V. Decarboxylase and alcohol dehydrogenase
Options :
(a) A – V, B – II, C – IV, D – III, E – I
(b) A – I, B – II, C – III, D – IV, E – V
(c) A – V, B – IV, C – III, D – II, E – I
(D) A – II, B – V, C – III, D – IV, E – I
Answer: a