NEET Biology Mineral Nutrition MCQs Set D

Question: Which is not a trace element?

• a) K
• b) Mo
• c) Cu
• d) Mn

Answer: K

Question: Find odd one (w.r.t. critical element)

• a) Nickel
• b) Phosphorus
• c) Potassium
• d) Nitrogen

Answer: Nickel

Question: Silicon, Cobalt, Sodium and Selenium are

• a) Required by higher plants
• b) Trace elements
• c) Essential minerals
• d) Macronutrients

Answer: Required by higher plants

Question: Tryptophan synthesis, carboxylase activity and little leaf of plants are all associated with

• a) Zn
• b) B
• c) Ca
• d) Cu

Answer: Zn

Question: Mineral which is part of CoA, Fd, thiamine and lipoic acid is

• a) S
• b) Ca
• c) Fe
• d) Mn

Answer:  S

Question: Hunger signs in plants are

• a) Deficiency symptoms of mineral nutrients
• b) Symptoms due to poor photosynthesis in plants
• c) Symptoms due to lesser water absorption in plants
• d) Symptoms due to excess water absorption in plants

Answer: Deficiency symptoms of mineral nutrients

Question:

(a) Moderate decrease or increase of micronutrients causes deficiency and toxicity symptoms respectively.
(b) Excess of manganese causes toxicity of iron, calcium and molybdenum.
(c) A macronutrient is said to be toxic when present below a critical concentration

• a) Only (a) is correct
• b) (b) & (c) are correct
• c) Only (b) is correct
• d) (a) & (c) are correct

Answer: Only (a) is correct

Question: Movement of electrolytes through the roots is generally

• a) Against electro chemical gradient and require energy
• b) Along electro chemical gradient and does not require energy
• c) A passive process
• d) Dependent on aquaporins

Answer: Against electro chemical gradient and require energy

Question: Initial phase of ion uptake

• a) Is passive and apoplastic
• b) Is active process
• c) Occurs through symplast
• d) More than one option is correct

Answer: Is passive and apoplastic

Question: The translocation of solute is

• a) All of these
• b) Dependent on transpiration pull
• c) Equal to the rate of translocation of water
• d) Through xylem vessel

Answer:  All of these

Question:

• a) Denitrification, Pseudomonas
• b) Ammonification, Bacillus
• c) Nitrification, Nitrosomonas
• d) Nitrate assimilation, Nitrogenase

Answer: Denitrification, Pseudomonas

Question: Process of nitrification and nitrate assimilation are

• a) Oxidation & reduction respectively
• b) Both are oxidation
• c) Reduction & oxidation respectively
• d) Both are reduction

Answer:  Oxidation & reduction respectively

Question:

• a) Nitrate assimilation, nitrate and nitrite reductase
• b) Ammonification, glutamate dehydrogenase
• c) Nitrification, nitrate and nitrite reductase
• d) Denitrification, transaminase

Answer: Nitrate assimilation, nitrate and nitrite reductase

Question:  Most common form of nitrogen uptake and usable forms for plants are respectively

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which of the following is/are diazotrophs?

• a) All of these
• b) Frankia and Klebsiella
• c) Rhizobium and Azotobacter
• d) Anabaena and Nostoc

Answer: All of these

Question: Which is not true for nitrogenase enzyme in root nodules in legumes?

• a) Resistant to O₂ conc
• b) Site of reduction of N₂ into NH₃
• c) Synthesized by nif genes of Rhizobium
• d) It is a Mo-F protein

Answer:  Resistant to O₂ conc

Question: Leghemoglobin is found in which one of the following organisms?

• a) Groundnut
• b) Nostoc
• c) Aulosira
• d) Anthoceros

Answer: Groundnut

Question: How many electron and protons are required to fix a dinitrogen?

• a) 8 each
• b) 16 each
• c) 4 each
• d) 32 each

Answer: 8 each

Question: Cycas and Azolla plants are associated with

• a) Anabaena
• b) Rhizobium
• c) Klebsiella
• d) Bacillus

Answer: Anabaena

Question:  Select the correct statements from the given

(a) Nitrogenase is a heterodimeric protein.
(b) Root hairs curl by action of nitrogenase and plant ‘nod factors’.
(c) During symbiotic N₂ fixation ATP is provided by legume plant

• a) (a), (c)
• b) only (c)
• c) (a), (b)
• d) (b), (c)

Answer: (a), (c)

Question: Nitrogenase enzyme found in root nodules in legumes contains

• a) Mo, Fe, S
• b) Mo, B, S
• c) Co, Mo, Ca
• d) Mo, Mn, S

Answer: Mo, Fe, S

Question: The amino acid which plays a central role in nitrogen metabolism is/are

• a) Glutamic acid
• b) Aspartic acid
• c) Double aminated keto acids
• d) None of these

Answer:  Glutamic acid

Question: Transported and storage form of nitrogen in plants are

• a) Amides
• b) Polypeptides
• c) Amino acids
• d) Double aminated keto acids

Answer: Amides

Question: Ureides are preferred forms for storage and transport of amines in

• a) Glycine max
• b) Allium cepa
• c) Solanum nigrum
• d) Triticum aestivum

Answer: Glycine max

Question: Essential elements are

• a) Both macro and micronutrients
• b) Only macronutrients
• c) Only micronutrients
• d) C, H, O & N only

Answer: Both macro and micronutrients

Question:  During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by

• a) Leghaemoglobin
• b) Xanthophyll
• c) Carotene
• d) Cytochrome

Answer: Leghaemoglobin

Question: Minerals known to be required in large amounts for plant growth include

• a) Phosphorus, potassium, sulphur, calcium
• b) Potassium, phosphorus, selenium, boron
• c) Magnesium, sulphur, iron, zinc
• d) Calcium, magnesium, manganese, copper

Answer: Phosphorus, potassium, sulphur, calcium

Question: Deficiency symptoms of nitrogen and potassium are visible first in

• a) Senescent leaves
• b) Young leaves
• c) Roos
• d) Buds

Answer:  Senescent leaves

Question: The first stable product of fixation of atomspheric nitrogen in leguminous plants is

• a) Ammonia
• b) Glutamate
• c) NO₂
• d) NO₃

Answer: Ammonia

Question: Which one of the following is wrong statement?

• a) Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins
• b) Nitrosomonas and Nitrobacter are chemoautotrophs
• c) Anabaena and Nostoc are capable of fixing nitrogen in free-living state also
• d) Root nodule forming nitrogen fixeres live as aeroebes under free-living conditions

Answer: Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins

Question: Which one of the following is correctly matched ?

• a) Potassium – Readily mobilization
• b) Passive transport of nutrients – ATP
• c) Bakane of rice seedings – F.Skoog
• d) Apoplast – Plasmodesmata

Answer:  Potassium – Readily mobilization

Question: For its action, nitrogenase requires

• a) High input of energy
• b) Light
• c) Super oxygen radicals
• d) Mn²⁺

Answer: High input of energy

Question: Best defined function of Manganese in green plants is

• a) Photolysis of water
• b) Calvin cycle
• c) Water absorption
• d) Nitrogen fixation

Answer: Photolysis of water

Question:  Nitrifying bacteria

• a) Oxidize ammonia to nitrates
• b) Convert proteins into ammonia
• c) Convert free nitrogen to nitrogen compounds
• d) Reduce nitrates to free nitrogen

Answer: Oxidize ammonia to nitrates

Question: The function of leghaemoglobin in the root nodules of legumes is

• a) Oxygen removal
• b) Expression of nif gene
• c) Inhibition of nitrogenase activity
• d) Nodule differentiation

Answer: Oxygen removal

Question: Which one of the following elements in plants is not remobilised?

• a) Calcium
• b) Potassium
• c) Phosphorus
• d) Sulphur

Answer: Calcium

Question: A prokaryotic autotrophic nitrogen fixing symbiont is found in

• a) Cycas
• b) Cicer
• c) Alnus
• d) Pisum

Answer: Cycas

Question: Which one of the following helps in absorption of phosphorus from soil by plants?

• a) Glomus
• b) Rhizobium
• c) Frankia
• d) Anabaena

Answer: Glomus

Question: Which one of the following is essential for photolysis of water?

• a) Manganese
• b) Zinc
• c) Boron
• d) Copper

Answer: Manganese

Question: Which one of the following is not an essential mineral element for plants while the remaining three are?

• a) Cadmium
• b) Phosphorus
• c) Iron
• d) Manganese

Answer: Cadmium

Question: Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation?

• a) Nitrogenase is insensitive to oxygen
• b) Nodules act as sites for nitrogen fixation
• c) Leghaemoglobin scavenges oxygen and is pinkish in colour
• d) The enzyme nitrogenase catalyses the conversion of atmospheric

Answer: Nitrogenase is insensitive to oxygen

Question: An element playing important role in nitrogen fixation is

• a) Molybdenum
• b) Copper
• c) Manganese
• d) Zinc

Answer: Molybdenum

Question: The common nitrogen-fixer in paddy fields is

• a) Azospirillum
• b) Azospirillum
• c) Rhizobium
• d) Frankia

Answer:  Azospirillum

Question: Which one of the following is not a micronutrient?

• a) Magnesium
• b) Zinc
• c) Molybdenum
• d) Boron

Answer: Magnesium

Question: One of the free-living, anaerobic nitrogen-fixer is

• a) Rhodospirillum
• b) Rhizobium
• c) Beijernickia
• d) Azotobacter

Answer:  Rhodospirillum

Question: Manganese is required in

• a) Photolysis of water during photosynthesis
• b) Nucleic acid synthesis
• c) Plant cell wall formation
• d) Chlorophyll synthesis

Answer: Photolysis of water during photosynthesis

Question: Nitrogen fixation in root nodules of Alnus is brought about by

• a) Frankia
• b) Clostridium
• c) Bradyhizobium
• d) Azorhizobium

Answer: Frankia

Question: Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?

• a) Casuarina equisetifolia
• b) Crotalaria juncea
• c) Cycas revolute
• d) Cicer arietinum

Answer:  Casuarina equisetifolia

Question: Which one of the following elements is not an essential micronutrient for plant growth?

• a) Ca
• b) Mn
• c) Zn
• d) Cu

Answer: Ca

Question: Which one of the following statements is correct?

• a) Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies
• b) At present it is not possible to grow maize without chemical fertilizers
• c) Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants
• d) Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in soil

Answer:  Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies

Question:  A plant requires magnesium for

• a) Chlorophyll synthesis
• b) Protein synthesis
• c) Holding cells together
• d) Cell wall development

Answer: Chlorophyll synthesis

Question: About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and

• a) Calcium and phosphorous
• b) Sulphur and magnesium
• c) Phosphorus and sulphur
• d) Magnesium and sodium

Answer:  Calcium and phosphorous

Question: Sulphur is an important nutrient for optimum growth and productivity in

• a) Pulse crops
• b) Cereals
• c) Fibre crops
• d) Oilseed crops

Answer: Pulse crops

Question: The deficiencies of micro-nutrients, not only affects growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport?

• a) Cu, Mn, Fe
• b) Co, Ni, Mo
• c) Mn, Co, Ca
• d) Ca, X, Na

Answer: Cu, Mn, Fe

Question: Which of the following elements is a constituent of biotin?

• a) Sulphur
• b) Magnesium
• c) Calcium
• d) Phosphorus

Answer: Sulphur

Question: Which one of the following elements is almost non-essential for plants?

• a) Na
• b) Ca
• c) Na
• d) Zn

Answer:  Na

Question: Plants take zinc in the form of

• a) Zn⁺⁺
• b) ZnO
• c) Zn
• d) ZnSO₄

Answer: Zn⁺⁺

Question: Element necessary for the middle lamella is

• a) Ca
• b) Zn
• c) K
• d) Cu

Answer: Ca

Question: Boron in green plants assists in

• a) Sugar transport
• b) Acting as enzyme co-factor
• c) Activation of enzymes
• d) Photosynthesis

Answer: Sugar transport

Question: The most abundant element present in the plants is

• a) Carbon
• b) Nitrogen
• c) Manganese
• d) Iron

Answer: Carbon

Question: Necrosis in crops is due to the deficiency of

• a) Ca, K, S and Mo
• b) N, K, S and Mo
• c) N, S, Fe and Zn
• d) Mg, S, Mn and Ca

Answer: Ca, K, S and Mo

Question: Which of the following is not caused by deficiency of mineral nutrition?

• a) Etiolation
• b) Necrosis
• c) Shortening of internode
• d) Chlorosis

Answer: Etiolation

Question: When the plants are grown in magnesium deficient but urea rich soil, the symptoms expressed are

• a) Yellowish leaves
• b) Colourless petiole
• c) Dark green leaves
• d) Shoot apex die

Answer: Yellowish leaves

Question: The major portion of the dry weight of plants comprises of

• a) Carbon, hydrogen and oxygen
• b) Calcium, magnesium and sulphur
• c) Nitrogen, phosphorus and potassium
• d) Carbon, nitrogen and hydrogen

Answer: Carbon, hydrogen and oxygen

Question: Grey spots of oat are caused by deficiency of

• a) Mn
• b) Fe
• c) Zn
• d) Cu

Answer:  Mn

Question:

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N₂)to the atmosphere?

• a) Anaerobic ammonium oxidation, and denitrification
• b) Aerobic nitrate oxidation, and nitrite reduction
• c)  Decomposition of organic nitrogen, and conversion of dinitrogen to ammonium compounds
• d)  Enteric fermentation in cattle, and nitrogen fixation by Rhizobium in root nodules of legumes

Answer: Anaerobic ammonium oxidation, and denitrification

Question: Nitrifying bacteria

• a) Oxidize ammonia to nitrates
• b) Convert proteins into ammonia
• c) Reduce nitrates to free nitrogen
• d) Convert free nitrogen to nitrogen compounds

Answer: Oxidize ammonia to nitrates

Question: Passive absorption of minerals depend on

• a) Temperature
• b) Metabolic inhibitor
• c) Temperature and metabolic inhibitor
• d) Auxin

Answer: Temperature

Question: In root nodules of legumes, leg-haemoglobin is important because it

• a) Acts as an oxygen scavenger
• b) Acts as a catalyst in transamination
• c) Transports oxygen to the root nodule
• d) Provides energy to the nitrogen fixing bacterium

Answer:  Acts as an oxygen scavenger

Question: Leghemoglobin is

• a) An oxygen scavenger in root nodules
• b) An oxygen carrier in human blood
• c) A protein used as food supplement
• d) A plant protein with high lysine content

Answer: An oxygen scavenger in root nodules

Question: Which one of the following statements is correct?

• a) Legumes fix nitrogen only through the specialized bacteria that live in their roots
• b) Legumes fix nitrogen independently of the specialized bacteria that live in their roots
• c) Legumes fix nitrogen only through specialized bacteria that live in their leaves
• d) Legumes are incapable of fixing nitrogen

Answer: Legumes fix nitrogen only through the specialized bacteria that live in their roots

Question: Enzyme first used for nitrogen fixation

• a) Nitrogenase
• b) Nitroreductase
• c) Transferase
• d) Transaminase

Answer: Nitrogenase

Question: Which one of the following mineral elements play an important role in biological nitrogen fixation ?

• a) Molybdenum
• b) Zinc
• c) Manganese
• d) Copper

Answer: Molybdenum

Question: A free living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is

• a) Anabaena
• b) Nostoc
• c) Chlorella
• d) Tolypothrix

Answer: Anabaena