Mineral Nutrition: NEET MCQ Questions [100+ Solved]

Below are the NEET MCQ questions on Class 11 Biology Chapter “Mineral Nutrition” based on the NCERT textbook. Solve the below free NEET mock test for a better understanding of the various topics. 100+ important MCQs (multiple choice questions) are given in this NEET question bank.

“Mineral Nutrition” is the 12th chapter in the unit “Plant Physiology” of class XI or class 11th Biology NCERT. Do note that NEET (which is conducted by NTA) is based on NCERT textbooks so they are a must-have. You can also download PDFs of NCERT textbooks.

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  1. NO2 is converted to NO3 by which bacteria?
    (a) Nitrobacter
    (b) Nitrosomonas
    (c) Nitrosococcus
    (d) Bacillus vulgaris

(a) Nitrobacter

  1. What causes nitrogen fixation in root nodules of Alnus?
    (a) Bradyrhizobium
    (b) Clostridium
    (c) Frankia
    (d) Azorhizobium

(c) Frankia

  1. Which of the following is a symbiotic nitrogen fixer?
    (a) Azotobacter
    (b) Frankia
    (c) Azolla
    (d) Glomus

(b) Frankia

  1. Which element plays an important role in nitrogen fixation?
    (a) Molybdenum
    (b) Copper
    (c) Manganese
    (d) Zinc

(a) Molybdenum

  1. A lack of micronutrients affects not only plant growth but also vital functions such as photosynthetic and mitochondrial electron flow. Which group of three elements below shall have the greatest impact on both photosynthetic and mitochondrial electron transport?
    (a) Co, Ni, Mo
    (b) Ca, K, Na
    (c) Mn, Co, Ca
    (d) Cu, Mn, Fe

(d) Cu, Mn, Fe

  1. Which one of the following elements is not an essential micronutrient for growth in plants?
    (a) Zn
    (b) Cu
    (c) Ca
    (d) Mn

(c) Ca

  1. What is the purpose of manganese?
    (a) plant cell wall formation
    (b) photolysis of water during photosynthesis
    (c) chlorophyll synthesis
    (d) nucleic acid synthesis

(b) photolysis of water during photosynthesis

  1. Which pair is incorrectly matched?
    (a) Alcohol – nitrogenase
    (b) Fruit juice – pectinase
    (c) Textile – amylase
    (d) Detergents – lipase

(a) Alcohol – nitrogenase

  1. Free-living, anaerobic nitrogen-fixers include?
    (a) Beijernickia
    (b) Rhodospirillum
    (c) Rhizobium
    (d) Azotobacter

(b) Rhodospirillum

  1. In leguminous plants, what is the first stable product of atmospheric nitrogen fixation?
    (a) Ammonia
    (b) NO3-
    (c) Glutamate
    (d) NO2-

(a) Ammonia

  1. Fixed nitrogen is released to the atmosphere as dinitrogen gas (N2) by which two distinct microbial processes?
    (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

(a) Anaerobic ammonium oxidation, and denitrification

  1. Biotin contains which of the following elements?
    (a) Sulphur
    (b) Magnesium
    (c) Calcium
    (d) Phosphorus

(a) Sulphur

  1. What role does an essential element not play?
    (a) being a component of biomolecules
    (b) changing the chemistry of soil
    (c) being a structural component of energy-related chemical
    (d) activation or inhibition of enzymes

(b) changing the chemistry of soil

  1. What is the best explanation for the term critical concentration of an essential element?
    (a) essential element concentration below which plant growth is retarded
    (b) essential element concentration below which plant growth becomes enhanced
    (c) essential element concentration below which the plant remains in the vegetative phase
    (d) None of the above

(a) essential element concentration below which plant growth is retarded

  1. Deficiency symptoms of an element tend to appear first in young leaves. It indicates that the element is relatively immobile. Such symptoms would be shown by which one of the following elemental deficiencies?
    (a) Sulphur
    (b) Magnesium
    (c) Nitrogen
    (d) Potassium

(a) Sulphur

  1. All of the following nutrients are obtained by terrestrial plants from soil except for?
    (a) potassium
    (b) nitrogen
    (c) phosphorus
    (d) carbon

(d) carbon

  1. A normal plant does not require which of the following elements?
    (a) K, Ca, Mg
    (b) Fe, Zn, Mn, B
    (c) Pb, I, Na
    (d) Mg, Fe, Mo

(c) Pb, I, Na

  1. What does a plant need for chlorophyll formation?
    (a) Fe, Ca & light
    (b) Fe, Mg & Light
    (c) Ca, K & light
    (d) Mn & Cu

(b) Fe, Mg & Light

  1. Mineral nutrients known as framework elements include?
    (a) N, S, P
    (b) C, H, O
    (c) Mg, Fe, Zn
    (d) Zn, Mn, Cu

(b) C, H, O

  1. What element is essential for the stability of chromosomes?
    (a) Zn
    (b) Ca
    (c) Mo
    (d) Fe

(c) Mo

  1. Because these ions are negatively charged and do not stick to negatively charged clay particles, soil can easily become deficient in them. What are these?
    (a) Nitrate
    (b) Calcium
    (c) Ammonium
    (d) Magnesium

(a) Nitrate

  1. A plant requires the least amount of which element for growth?
    (a) Zn
    (b) N
    (c) P
    (d) Ca

(a) Zn

  1. What essential element is not properly categorized?
    (a) Cu
    (b) Zn
    (c) Mg
    (d) Mn

(c) Mg

  1. What are the critical elements for crops?
    (a) N, P, K
    (b) C, H, O
    (c) N, S, Mg
    (d) K, Ca, Fe

(a) N, P, K

  1. What mineral nutrient plays a major role in apical meristematic activity?
    (a) K
    (b) Ca
    (c) N
    (d) S

(b) Ca

  1. When ammonia is converted into nitrates by Nitrosomonas, what is the process called?
    (a) nitrogen fixation
    (b) nitrification
    (c) denitrification
    (d) ammonification

(b) nitrification

  1. Deficiency of what causes “Reclamation” and “Little leaf” disease?
    (a) Zn and Mo
    (b) Cu and Zn
    (c) Cu and B
    (d) Mn and Cu

(b) Cu and Zn

  1. Plants absorb mineral salts from the soil solution through?
    (a) A semipermeable membrane into the cytoplasm
    (b) Perforations at the apex of root hair cells
    (c) The semipermeable cell wall
    (d) None of these

(a) A semipermeable membrane into the cytoplasm

  1. What does carrier protein help in?
    (a) Active absorption of ions
    (b) Passive absorption of ions
    (c) Water absorption
    (d) Vaporization

(a) Active absorption of ions

  1. What does the active uptake of minerals depend upon?
    (a) Active water absorption
    (b) Transpiration
    (c) Photorespiration
    (d) Dephosphorylation

(d) Dephosphorylation

  1. Deficiency of what causes brown heart rot in beets?
    (a) B
    (b) P
    (c) Mg
    (d) Mo

(a) B

  1. Deficiency of molybdenum is related to which disease?
    (a) Whiptail disease of cauliflower
    (b) Little leaf disease
    (c) Reclamation disease of cereals
    (d) Brown heart disease

(c) Reclamation disease of cereals

  1. Which element is related to Khaira disease of paddy & auxin synthesis?
    (a) Fe
    (b) Zn
    (c) B
    (d) Cu

(a) Fe

  1. ______ molecules are extremely sensitive to nitrogenase enzymes.
    (a) Hydrogen
    (b) Oxygen
    (c) Water
    (d) CO2

(b) Oxygen

  1. Protein synthesis involves which of the following elements?
    (a) Sulphur
    (b) Silver
    (c) Lead
    (d) Phosphorus

(a) Sulphur

  1. Which of the following is not a correct pairing of a macronutrient and its major function in a plant’s life?
    (a) Potassium-enzyme activation, water balance, ion balance.
    (b) Calcium-activity of membranes and cytoskeleton, second messenger.
    (c) Sulfur-in proteins and coenzymes.
    (d) Iron-in active sites of many redox enzymes and electron carriers.

(d) Iron-in active sites of many redox enzymes and electron carriers.

  1. The soil does not absorb which of the following elements?
    (a) Carbon
    (b) Nitrogen
    (c) Potassium
    (d) All of these

(a) Carbon

  1. Which is an essential mineral element that stimulates the activity of many enzymes but is not a component of any enzyme?
    (a) Zn
    (b) Mg
    (c) Mn
    (d) K

(d) K

  1. What is a common symptom caused by P, K, Ca, and Mg deficiency in plants?
    (a) Bending of leaf tip
    (b) Formation of anthocyanin
    (c) Poor development of vasculature
    (d) Appearance of dead necrotic areas

(d) Appearance of dead necrotic areas

  1. Which is a mineral that maintains the balance between cations and anions in cells?
    (a) Cl and K
    (b) K and Fe
    (c) Cl and Mg
    (d) Ca and Mg

(a) Cl and K

  1. Which is essential for N2 metabolism?
    (a) B
    (b) Mo
    (c) Cu
    (d) Mg

(b) Mo

  1. Which one of the following mineral elements plays an important role in biological nitrogen fixation?
    (a) Copper
    (b) Manganese
    (c) Zinc
    (d) Molybdenum

(d) Molybdenum

  1. Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganisms?
    (a) Cicer arietinum
    (b) Casuarina equisetifolia
    (c) Crotalaria juncea
    (d) Cycas revoluta

(b) Casuarina equisetifolia

  1. What is the most abundant gas in our atmosphere that plants cannot utilize directly in its atmospheric form and is captured by certain bacteria that live symbiotically in the nodules of roots?
    (a) Oxygen
    (b) Nitrogen
    (c) Neon
    (d) Hydrogen

(b) Nitrogen

  1. What is the function of the swellings called nodules in legume roots?
    (a) produce antibiotics that protect the plant from soil bacteria.
    (b) provide a steady supply of sugar to the host plant.
    (c) increases the surface area for water uptake.
    (d) contain nitrogen-fixing bacteria.

(d) contain nitrogen-fixing bacteria.

  1. Leguminous plants fix nitrogen with which pigment?
    (a) Phycocyanin
    (b) Leghaemoglobin
    (c) Phycoerythrin
    (d) Myoglobin

(b) Leghaemoglobin

  1. The pink colour of nodules that are actively fixing nitrogen indicates the presence of what?
    (a) Fe
    (b) Chlorophyll
    (c) Leg-haemoglobin
    (d) Anthocyanin

(c) Leg-haemoglobin

  1. Nitrogenase
    (a) is insensitive to oxygen.
    (b) contains magnesium.
    (c) releases two NH3 molecules as products.
    (d) requires an aerobic environment.

(c) releases two NH3 molecules as products.

  1. Which bacteria carries denitrification?
    (a) Pseudomonas and Thiobacillus
    (b) Nitrosomonas and Nitrococcus
    (c) Nitrosomonas and Nitrobacter
    (d) Pseudomonas and Nitrococcus

(a) Pseudomonas and Thiobacillus

  1. How is nitrogen gas reduced to ammonia?
    (a) Rhizobium
    (b) Nitrogenase
    (c) Nitrification
    (d) Denitrification

(b) Nitrogenase

  1. What statement about nitrification is false?
    (a) Nitrobacter oxidizes nitrite to nitrate.
    (b) Nitrosomonas and Nitrosococcus convert ammonium ions to nitrite.
    (c) Nitrification reactions are energy-producing (exergonic) reactions.
    (d) Heterotrophic plants are more directly dependent on the nitrifying bacteria for usable nitrogen than autotrophic plants.

(d) Heterotrophic plants are more directly dependent on the nitrifying bacteria for usable nitrogen than autotrophic plants.

  1. Prokaryotic autotrophic nitrogen-fixing symbionts are found in?
    (a) Alnus
    (b) Cycas
    (c) Cicer
    (d) Pisum

(b) Cycas

  1. Nitrifying bacteria helps to?
    (a) oxidize ammonia to nitrates
    (b) convert free nitrogen to nitrogen compounds
    (c) convert proteins into ammonia
    (d) reduce nitrates to free nitrogen

(a) oxidize ammonia to nitrates

  1. What is the function of leghaemoglobin in the root nodules of legumes?
    (a) inhibition of nitrogenase activity
    (b) oxygen removal
    (c) nodule differentiation
    (d) expression of nif gene

(b) oxygen removal

  1. The photolysis of water requires which of the following?
    (a) Manganese
    (b) Zinc
    (c) Copper
    (d) Boron

(a) Manganese

  1. The glucose molecule is converted into what during glycolysis?
    (a) PEP
    (b) RuBP
    (c) Acetyl CoA
    (d) Pyruvic acid

(d) Pyruvic acid

  1. For plants to grow, which element is not an essential micronutrient?
    (a) Ca
    (b) Mn
    (c) Zn
    (d) Cu

(a) Ca

  1. In nitrogen fixation, which element is important?
    (a) Mn
    (b) Mo
    (c) Zn
    (d) Cu

(b) Mo

  1. In a cell, which of the following is a free ion?
    (a) P
    (b) K
    (c) Fe
    (d) B

(b) K

  1. Which element is not considered a macronutrient?
    (a) Mg
    (b) Ca
    (c) Mn
    (d) P

(c) Mn

  1. Which element can not be placed along with micronutrients?
    (a) Mn
    (b) Mo
    (c) Cu
    (d) Ca

(d) Ca

  1. What is the source of cobalt?
    (a) Vit. A
    (b) Vit. B2
    (c) Vit. B12
    (d) Vit. C

(c) Vit. B12

  1. Fe is obtained by plants in the form of?
    (a) Ferric ions
    (b) Ferrous ion
    (c) Either ferric or ferrous ions
    (d) FeSO4

(a) Ferric ions

  1. Among the elements present in plants, which is most abundant?
    (a) Iron
    (b) Carbon
    (c) Nitrogen
    (d) Manganese

(b) Carbon

  1. Plant cells’ middle lamella is composed of which of the following?
    (a) Mg
    (b) Ca
    (c) K
    (d) Fe

(b) Ca

  1. Leg haemoglobin plays an important role in the root nodules of legumes because?
    (a) It transports oxygen to the root nodule
    (b) It acts as an oxygen scavenger
    (c) It provides energy to the nitrogen-fixing bacterium
    (d) It acts as a catalyst in trans-amination

(b) It acts as an oxygen scavenger

  1. Among the following elements in plants, which one is not remobilized?
    (a) Sulphur
    (b) Phosphorus
    (c) Calcium
    (d) Potassium

(c) Calcium

  1. What statement about Rhizobium legume nodule formation is false?
    (a) Rhizobium can only fix nitrogen after it becomes a bacteroid within a root cortex cell.
    (b) Rhizobium induces invagination of root hairs.
    (c) Within an infection thread, Rhizobium is still extracellular to the plant.
    (d) The infection thread can fuse with any root cell of an appropriate legume species.

(d) The infection thread can fuse with any root cell of an appropriate legume species.

  1. Which of the following best describes the relationship between Rhizobium and legume roots?
    (a) Parasitic
    (b) Symbiotic
    (c) Mutualistic
    (d) Carnivorous

(c) Mutualistic

  1. What are Azotobacter and Beijerinckia examples of?
    (a) symbiotic nitrogen-fixers
    (b) non-symbiotic nitrogen-fixers
    (c) ammonifying bacteria
    (d) disease-causing bacteria

(b) non-symbiotic nitrogen-fixers

  1. What is a free-living nitrogen-fixing cyanobacterium that can form a symbiotic association with the water fern Azolla?
    (a) Tolypothrix
    (b) Chlorella
    (c) Nostoc
    (d) Anabaena

(d) Anabaena

  1. What is the rod-shaped structure in the cell of a root nodule in a leguminous plant?
    (a) Bacteria
    (b) Infection thread
    (c) Bacteroid
    (d) Ureide

(c) Bacteroid

  1. Plants use which of the following amides in nitrogen assimilation?
    (a) Glutamate
    (b) Alanine
    (c) Asparagine
    (d) Serine

(c) Asparagine

  1. What is the process of converting organic nitrogenous compounds into ammonia compounds called?
    (a) Nitrification
    (b) Ammonification
    (c) Denitrification
    (d) Denaturation

(b) Ammonification

  1. Where do Nif genes occur?
    (a) Rhizobium
    (b) Aspergillus
    (c) Penicillium
    (d) Streptococcus

(a) Rhizobium

  1. In addition to maintaining ionic balance and solute concentration, which element participates in the photolysis of water?
    (a) Cl–
    (b) B
    (c) Na+
    (d) Mg2+

(a) Cl–

  1. What is an incorrect match between essential elements and their functions?
    (a) Manganese – structural component of chlorophyll.
    (b) Calcium – component of the middle lamella.
    (c) Zinc – enzyme activator.
    (d) Iron – component of ferredoxin.

(a) Manganese – structural component of chlorophyll.

  1. In hydroponics, plants are grown in?
    (a) Greenhouse
    (b) Water-saturated sand
    (c) Balanced nutrient solution
    (d) Purified distilled water

(c) Balanced nutrient solution

  1. What are the minerals associated with redox reactions?
    (a) Na, Cu
    (b) N, Cu
    (c) Fe, Cu
    (d) Ca, Fe

(b) N, Cu

  1. A deficiency of what causes Gray spots on Oats?
    (a) Cu
    (b) Zn
    (c) Mn
    (d) Fe

(c) Mn

  1. In which of the following form, sugar is transported within the body of a plant?
    (a) Sucrose
    (b) Lactose
    (c) Glucose
    (d) Maltose

(a) Sucrose

  1. Which of the following is not caused by a deficiency of mineral nutrition?
    (a) Necrosis
    (b) Chlorosis
    (c) Etiolation
    (d) Yellowing

(c) Etiolation

  1. A deficiency of what causes interveinal chlorosis in leaves?
    (a) Nitrogen
    (b) Calcium
    (c) Potassium
    (d) Magnesium

(d) Magnesium

  1. Which statement is wrong?
    (a) Plants take a very little amount of mineral elements from the soil
    (b) Plants absorb one thing at a time either water or mineral salt
    (c) Root hair absorb water and minerals together
    (d) Mineral absorption primarily takes place by active method

(b) Plants absorb one thing at a time either water or mineral salt

  1. Manganese toxicity in plants does not cause which of the following symptoms?
    (a) Calcium translocation in shoot apex is inhibit
    (b) Deficiency in both iron and nitrogen induced
    (c) Appearance of brown spot surrounded by chlorotic veins
    (d) None of the above

(d) None of the above

  1. Which of the following statement/statements is/are true about Rhizobium’s biological nitrogen fixation in association with soybean?
    (a) Nitrogenase may require oxygen for its functioning.
    (b) Nitrogenase is Mo-Fe protein
    (c) Leg-haemoglobin is a pink-coloured pigment.
    (d) Nitrogenase h

(a) Nitrogenase may require oxygen for its functioning.

  1. Where can plants be grown? (Tick the incorrect option)
    (a) soil with essential nutrients.
    (b) water with essential nutrients.
    (c) either water or soil with essential nutrients.
    (d) water or soil without essential nutrients.

(c) either water or soil with essential nutrients.

  1. What are the two distinct microbial processes that release fixed nitrogen to the atmosphere as dinitrogen gas (N2)?
    (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

(a) Anaerobic ammonium oxidation, and denitrification

  1. What element is a constituent of biotin?
    (a) Sulphur
    (b) Magnesium
    (c) Calcium
    (d) Phosphorus

(a) Sulphur

  1. Nitrogen and potassium deficiency symptoms appear first in?
    (a) Senescent leaves
    (b) Young leaves
    (c) Roots
    (d) Buds

(a) Senescent leaves

  1. For plant growth, what minerals are required in large quantities?
    (a) calcium, magnesium, manganese, copper
    (b) potassium, phosphorus, selenium, boron
    (c) magnesium, sulphur, iron, zinc
    (d) phosphorus, potassium, sulphur, calcium

(d) phosphorus, potassium, sulphur, calcium

  1. In which of the following are all three macronutrients?
    (a) Boron, zinc, manganese
    (b) Iron, copper, molybdenum
    (c) Molybdenum, magnesium, manganese
    (d) Nitrogen, calcium, phosphorus

(d) Nitrogen, calcium, phosphorus

  1. How does leghaemoglobin help in?
    (a) nitrogen fixation
    (b) protecting nitrogenase from O2
    (c) destroys bacteria
    (d) transport of food in plants

(b) protecting nitrogenase from O2

  1. What is the correct set of micronutrients for plants?
    (a) Mg, Si, Fe, Cu, Ca
    (b) Cu, Fe, Zn, B, Mn
    (c) Mg, Fe, Zn, B, Mn
    (d) Mo, Zn, Cl, Mg, Ca

(b) Cu, Fe, Zn, B, Mn

  1. A plant’s ability to translocate sugar depends on which of the following elements?
    (a) Boron
    (b) Molybdenum
    (c) Manganese
    (d) Iron

(a) Boron

  1. What are the causes of iron deficiency?
    (a) interveinal chlorosis first on young leaves
    (b) decrease in protein synthesis
    (c) reduced leaves and stunted growth
    (d) bending of stem tip

(a) interveinal chlorosis first on young leaves

  1. What does plant ash indicate?
    (a) Mineral salts absorbed by the plant
    (b) Organic matter of the plant
    (c) Both the mineral salts and organic matter
    (d) None of the above

(a) Mineral salts absorbed by the plant

  1. In roots, where do most nutrients get absorbed?
    (a) At the root tip, where root tissue first encounters soil away from the zone of nutrient depletion.
    (b) At the Casparian strip, where ions must enter the symplast before entering xylem cells.
    (c) In the symplastic and apoplastic pathways.
    (d) In root hairs and the zone of maturation.

(d) In root hairs and the zone of maturation.

  1. We determine whether an element is essential by observing the growth of plants
    (a) On soil in which the particular element is removed
    (b) On soil in which only the particular element is present
    (c) On an inert medium to which a solution of only the particular element is added
    (d) On an inert medium to which a nutrient solution excluding that particular element, is added.

(d) On an inert medium to which a nutrient solution excluding that particular element, is added.

  1. Which bacteria converts NO2 to NO3?
    (a) Nitrobacter
    (b) Nitrosomonas
    (c) Nitrosococcus
    (d) Bacillus vulgaris

(a) Nitrobacter

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