Mineral Nutrition Class 11 Biology Important Questions

Please refer to Mineral Nutrition Class 11 Biology Important Questions with solutions provided below. These questions and answers have been provided for Class 11 Biology based on the latest syllabus and examination guidelines issued by CBSE, NCERT, and KVS. Students should learn these problem solutions as it will help them to gain more marks in examinations. We have provided Important Questions for Class 11 Biology for all chapters in your book. These Board exam questions have been designed by expert teachers of Standard 11.

Class 11 Biology Important Questions Mineral Nutrition

Objective Questions

Question. The T.S. of nodule indicates that it is red/orange in its
(a) Outer part
(b) Ba part
(c) Central part
(d) Terminal part

Question. The plants cannot accumulate NH₄⁺ ion because
(a) It is oxidising agent
(b) It is reducing agent
(c) It is oxidatively aminated
(d) It is toxic to plants

Question. The process of conversion of NH⁺₄ NO₂^–1 No₃^–1 is called
(a) Ammonification
(b) Nitrification
(c) N₂ fixation
(d) Dentrification

Question. Which one is correct?
(a) N,P,K are critical elements and are present in most of the fertilizers
(b) Phytotron– Plants are grown under controlled conditions
(c) Mg in chl and P in ATP are elements of energy related compounds in plants
(d) All

Question. The amino acids which plays a central role in nitrogen metabolism is/are
(a) Glutamic acid
(b) A–ketoglutaric acid
(c) Aspartic acid
(d) Double aminated keto acids

Question. Transported and storage form of nitrogen in plants are
(a) Amides
(b) Polypeptides
(c) Amino acids
(d) aketoglutaric acids

Question. Nitrite reducatase enzyme is used to convert
(a) Nitrate into nitrite ion
(b) Nitrogen of atmosphere into ammonia
(c) Ammonia into nitrates
(d) Nitrite to ammonium ion

Question. Most of the mineral nutrients required by plants are absorbed by the root cells by the process
(a) Phagocytosis
(b) Passice transport
(c) Active transport
(d) Osmosis

Question. Characteristic of an ion channel includes which of the following?
(a) They are transmembrane proteins
(b) They are gated channels
(c) They act as selective pores.Transport through the channel always passive
(d) All

Question. Select the false statement
(a) Leg– haemoglobin is present in the cytoplasm of infected nodule cells.
(b) The host plant (legume) produce globin part while bacteria (Rhizobium) produces haem part of leg–hemoglobin
(c) Most of our knowledge about mechanisms of absorption of nutrients by root is based on a single plant cell, isolated tissue and/or organ, and it
shows that 3 main phases are involved in this process
(d) Ion transport across the root obeys the same biophysical laws that govern cellular transport

Question. Corn is a crop that requires a lot of nitrogen to grow properly. Farmers will often grow corn in a particular field every year, alternating it with a legume What is the purpose of this
(a) Legumes form mycorrhizal association which can convert atmospheric N₂ into a form usable by plants
(b) Legume roots contain bacteria that convert atmospheric nitrogen into a form usable by plants
(c) Legume are the only plants that can convert atmospheric nitrogen into a form usable by plants
(d) Legume deplete the soil of nitrogen, so corn is grown to replenish the nitrogen in the soil

Question. Partial mineral element is
(a) N
(b) P
(c) K
(d) Fe

Question. I. Component of chlorophyII
II. Helps to maintain ribosome structure
III. Activator for Rubisco and Pepcase
IV. Activates the enzymes of respiration and photosynthesis
V. Involved in synthesis of nucleic acids
The above roles are played by
(a) Ca⁺²
(b) Mg⁺²
(c) Mn⁺²
(d) CI⁺²

Question. Minerals associated with redox reaction are
(a) Na,Cu
(b) N,Cu
(c) Fe,Cu
(d) Ca,Fe

Question. Inhibition of cell division occurs due to lack or low level of?
(a) N but not S
(b) S but not K
(c) N, S and K
(d) K but not S and N

Question. In plants a common symptom caused by deficiency of P,K,N and Mg is
(a) Leaf tip hooking
(b) Anthocyanin development
(c) Necrosis/death of tissue
(d) Poor formation of vascular tissue

Question. A. The deficiency of any elements can cause multiple symptoms
B. Same symptoms may be caused by the deficiency of one or several different elements
C. The concentration of the essential element below which plant growth is retarded is termed as critical concentration
D. Chlorosis is the loss of chlorophyII due to deficiency of N, K, Mg, S, Mn, Zn, Mo
E. Different plants respond differently to the deficiency of the same element
Which one is correct?
(a) A,B,C,D,E
(b) Only A and D
(c) Only A and C
(d) Only C and D

Question. An element which with the help of Na⁺ and K⁺ determines the solute concentration and anion-cation balance in cell is
(a) CI
(b) S
(c) Zn
(d) Mo

Question. Crop plants absorb carbon in the form of
(a) Elements carbon from the soil
(b) CO₂ from the soil
(c) CO₂ from the air
(d) Carbonates

Question. Hydroponics is a system of growing plants in
(a) Soilless culture or Solution Culture
(b) Acidic soil
(c) Soilless culture with alkaline pH
(d) Soilless culture with acidic pH

Question. Plants obtain Fe in the form of
(a) Ferric ions
(b) Ferrous ion
(c) Either ferric or ferrous ions
(d) FeSO₄

Question. Hydroponics refers to the plant development
(a) without soil.
(b) in saline soil.
(c) in water without soil.
(d) without soil with alkaline pH.

Question. More than ‘X’ elements of the ‘Y’ discovered so far are found in different plants. Identify ‘X’ and ‘Y’.
(a) X – 0; Y – 110
(b) X – 80; Y – 105
(c) X- 60; Y – 105
(d) X- 70; Y – 115

Question. The amount of trace elements per kg dry matter is
(a) 10 m mole
(b) above 10 m mole
(c) less than 10 m mole
(d) 100 m mole

Question. Boron in green plants assists in
(a) sugar transport
(b) activation of enzymes
(c) acting as enzyme cofactor
(d) photosynthesis

Question. _________ is an constituent of the ring structure of chlorophyll and helps to maintain the ribosome structure.
(a) Manganese
(b) Magnesium
(c) Molybdenum
(d) Copper

Question. Which of the following elements are constituents of protein?
(a) Nitrogen and phosphorus
(b) Nitrogen and chlorine
(c) Phosphorus and boron
(d) Chlorine and potassium

Question. Which of the following element is necessary in plants for protein synthesis and also it is a constituent of hormones and many of the vitamins?
(a) Calcium
(b) Phosphorus
(c) Nitrogen
(d) Magnesium

Question. Any mineral ion concentration in tissues that reduces the dry weight of tissues by about _______ is considered toxic.
(a) 10%
(b) 20%
(c) 30%
(d) 40%

Question. All are correct about micronutrients except
(a) Role in enzyme activation is secondary
(b) Little role in protoplasmic structure
(c) Do not cause osmotic potential
(d) Become toxic in excess

Question. Which of the following medium is NOT used in the growth of hydroponic plants?
(a) Minerals
(b) Water
(c) Light
(d) Soil

Question. What types of plants can be grown hydroponically?
(a) Vegetables
(b) Flowers
(c) Herbs
(d) All of above

Question. The accompanying diagram shows hydroponic/soilless plant production. Plants are grown in a tube. The arrows indicate the direction of flow or trough placed on a slight incline. The arrows indicate the direction of flow of nutrient solution.
Nutrient solution is sent to the elevated end of the tube from the reservoir by _____ and it flows backinto reservoir due to _____

(a) Pump,Pump
(b) Gravity, Gravity
(c) Gravity,Pump
(d) Pump, Gravity

Question. Phytolysis of water needs
(a) Mn⁺²
(b) Mn⁺², SO₄^–2
(c) Na⁺,K⁺
(d) Na⁺,CI^––

Question. Select the wrong statements
(a) Different plants respond differently to the deficiency of the same element
(b) Deficiency of N,S,Mo delays flowering.
(c) The requirement of micronutrients is always in high amount
(d) By hydroponics, essential elements were identified and their hunger signs discovered

Question. Identify the incorrect one
(a) There are techniques that are able to detect the minerals even at 10^–8 g/ml
(b) Micronutrients are needed in very small amounts (less than 10 mmole Kg^–1 of dry wt)
(c) Cu is essential for overall metabolism in plants
(d) Cu is absorbed as cuprus form

Question. A. Minerals are absorbed in ionic forms as a very dilute solution
B. Boron is absorbed as BO₃^–1 or B₄O₇^2– Mo is absorbed as molybdate ions
C. C,H,O,N = essential elements of biomolecules/structural elements of cells
D. Solutes play an insignificant role in cellular determination
E. Macronutrients = Mn, Zn, Cu, B, Mo, Cl, Fe and N
F. Micronutrients = C,H,O,P,K,N,S,Ca and Mg
Options :
(a) All are false
(b) All are correct
(c) E,D,F are correct
(d) A,C,D are correct

Statement Type Questions

Question. Which of the following statements is not correct about macro- nutrients?
(a) They are present in plant tissues in excess of 100 m mole per kg of dry matter.
(b) They include C, H, O, N, P, S, K, Ca, Mg.
(c) Some elements attained from CO₂ and H₂O while the others are absorbed from the soil.
(d) C, H & O are mainly obtained from CO₂ and H₂O.

Question. Which of the following statements about Rhizobium legume nodule formation is not correct ?
(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.

Question. Which of the following statements about nitrogen fixation is correct ?
(i) Nitrogenase is only catalytic under anaerobic conditions.
(ii) The energy for nitrogen fixation can be provided by either photosynthesis or respiration.
(iii) In nitrogen fixation, nitrogen is reduced by the addition of three successive pairs of hydrogen atoms.
(iv) Most nitrogen fixing microbes are aerobic.
(a) (i) and (ii) only
(b) (ii) and (iv) only
(c) (i), (ii) and (iii) only
(d) All of the above

Question. Which of the following statements are correct?
(i) Magnesium competes with iron and manganese for uptake and with iron for binding with enzymes.
(ii) Magnesium inhibit calcium translocation in shoot apex.
(iii) Excess of manganese may induce deficiencies of iron, magnesium and calcium.
(iv) Symptoms of manganese toxicity may actually be the deficiency symptoms of iron, magnesium and
calcium.
(a) (i), (ii) and (iii)
(b) (i) and (ii)
(c) (iii) and (iv)
(d) (ii), (iii) and (iv)

Question. Which of the following statement(s) is/are correct?
(i) Conversion of organic nitrogen to NH₄⁺ by soil microbes is called ammonification.
(ii) Ammonia is first oxidized to nitrite by Nitrosomonas and Nitrosococcus.
(iii) The nitrite is further oxidized to nitrate with the help of the bacterium Thiobacillus.
(iv) In leaves, nitrate is reduced to form ammonia that finally forms the –NH₂ group of amino acids.
(v) Nitrosomonas, Nitrosococcus and Nitrobacter are Chemoautotrophs.
(a) (i), (ii) and (iii)
(b) (ii), (iii), (iv) and (v)
(c) (i), (iii) and (v)
(d) (i), (ii), (iv) and (v)

Critical Thinking Type Questions

Question. Plants absorb nitrogen from soil mainly in the form of
(a) N₂-gas
(b) nitric acid
(c) nitrite
(d) nitrate

Question. An important essential element which is required by plants in the greatest amount is
(a) nitrogen
(b) iron
(c) sulphur
(d) copper

Question. The term critical concentration means
(a) essential element concentration below which plant remains in the vegetative phase.
(b) essential element concentration below which the plant growth is retarded.
(c) essential element concentration above which the plant growth is stunted.
(d) non-essential element concentration below which plant growth is retarded.

Question. In an active process, the entry or exit of ions to and from the symplast requires
(a) ATP
(b) cyclic AMP
(c) NADH
(d) NADPH

Question. Some bacteria such as ‘X’ and ‘Y’ occur in soil which reduce nitrate to nitrogen by the process of ‘Z’. Identify ‘X’, ‘Y’ and ‘Z’
(a) ‘X’-Nitrogen, ‘Y’-Pseudomonas, ‘Z’-Ammonification
(b) ‘X’-Nitrosomonas, ‘Y’-Thiobacillus, ‘Z’-Ammonification
(c) ‘X’-Pseudomonas, ‘Y’-Thiobacillus, ‘Z’-Nitrification
(d) ‘X’-Pseudomonas, ‘Y’-Thiobacillus, ‘Z’- Dentrification

Question. All are free-living nitrogen fixers except
(a) Azotobacter
(b) Beijernickia
(c) Anabaena
(d) Rhizobium

Matching Type Questions

Question. Match column-I with column-II and choose the correct option.

Column – I (Nutrients)	Column -II (Functions)
A. Mg2+	I. Activator of dehydrogenase
B. Zn2+	II. Activator for both Ru BP carboxylaseoxygenase and PEP are
C. K+	III. Required for all Phosphorylation reactions
D. H2PO4–	IV. Plays an important role in opening and closing of stomata

(a) A – II, B – IV, C – I, D – III
(b) A – II, B – I, C – IV, D – III
(c) A – III, B – I, C – IV, D – II
(d) A – III, B – I, C – II, D – IV

Question. Match the column-I with column-II and choose the correct option.

Column-I	Column-II
A. Manganese	I. Component of various enzymes and participate in nitrogen metabolism.
B. Zinc	II. Required for pollen germination and carbohydrate translocation
C. Molybdenum	III. Helps in splitting of water to liberate oxygen during photosynthesis
D. Boron	IV. Needed in the synthesis of auxin

(a) A – I, B – IV, C – III, D – IV
(b) A – III, B – II, C – I, D – IV
(c) A – III, B – IV, C – I, D – II
(d) A – IV, B – III, C – II, D – I

Question. Match the column-I with column-II and choose the correct combination from the option given below.

Column -I	Column-II
A. Zinc	I. Chlorophyll
B. Sulphur	II. IAA
C. Magnesium	III. Nitrate reductase
D. Molybdenum	IV. Cysteine

(a) A – I, B – II, C – III, D – IV
(b) A – III, B – IV, C – I, D – II
(c) A – III, B – I, C – II, D – IV
(d) A – II, B – IV, C – I, D – III

Question. Which of the following bacteria is correctly matched with their function ?
A. Nitrosomonas – Nitrite to nitrate
B. Thiobacillus – Dentrification
C. Nostoc – Free-living nitrogen-fixer
D. Azotobacter – Anaerobic nitrogen-fixer
(a) A and B
(b) C and D
(c) B and C
(d) B and D

Question. Which of the following is an incorrect match of essential element and function?
(a) Manganese – Structural component of chlorophyll.
(b) Calcium – Component of the middle lamella.
(c) Zinc – Enzyme activator.
(d) Iron – Component of ferredoxin.