NCERT solutions for Biology Exemplar class 11 chapter 12 - Mineral Nutrition [Latest edition]

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NCERT solutions for Biology Exemplar class 11 chapter 12 - Mineral Nutrition -
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Chapter 12: Mineral Nutrition

Exercises [Pages 63 - 67]

NCERT solutions for Biology Exemplar class 11 Chapter 12 Mineral Nutrition Exercises [Pages 63 - 67]


Exercises | Q 1. | Page 63

Which one of the following roles is not characteristic of an essential element?

  • Being a component of biomolecules

  • Changing the chemistry of soil

  • Being a structural component of energy related chemical compounds

  • Activation or inhibition of enzymes

Exercises | Q 2. | Page 63

Which one of the following statements can best explain the term critical concentration of an essential element?

  • Essential element concentration below which plant growth is retarded

  • Essential element concentration below which plant growth becomes stunted

  • Essential element concentration above which plant remains in the vegetative phase.

  • None of the above

Exercises | Q 3. | Page 63

Deficiency symptoms of an element tend to appear first in young leaves. It indicates that the element is relatively immobile. Which one of the following elemental deficiency would show such symptoms?

  • Sulphur

  • Magnesium

  • Nitrogen

  • Potassium

Exercises | Q 4. | Page 63

Which one of the following symptoms is not due to manganese toxicity in plants?

  • Calcium translocation in shoot apex is inhibited

  • Deficiency in both Iron and Nitrogen is induced

  • Appearance of brown spot surrounded by chlorotic veins

  • None of the above

Exercises | Q 5. | Page 64

Reaction carried out by N2 fixing microbes include

  1. \[\ce{2NH3 + 3O2 -> 2NO^{-}2 + 2H^{+} + 2H2O (i)}\]
  2. \[\ce{2NO^{-}2 + O2 -> 2NO^{-}3 (ii)}\]

Which of the following statements about these equations is not true

  • Step (i) is carried out by Nitrosomonas or Nitrococcus

  • Step (ii) is carried out by Nitrobacter

  • Both steps (i) and (ii) can be called nitrification

  • Bacteria carrying out these steps are usually photoautotrophs

Exercises | Q 6. | Page 64

With regard to the Biological Nitrogen Fixation by Rhizobium in association with soybean, which one of the following statement/ statements does not hold true.

  • Nitrogenase may require oxygen for its functioning

  • Nitrogenase is MO- Fe protein

  • Leg-hemoglobin is a pink coloured pigment

  • Nitrogenase helps to convert N2 gas into two molecules of ammonia

Exercises | Q 7. | Page 64

Match the element with its associated functions/roles and choose the correct option among given below

Column I Column II
A. Boron i. Splitting of H2O to liberate O2 during photosynthesis
B. Manganese ii. Needed for synthesis of auxins
C. Molybdenum iii. Component of nitrogenase
D. Zinc iv. Pollen germination
E. Iron v. Component of ferredoxin
  • A - i, B - ii, C - iii, D - iv, E - v

  • A - iv, B - i, C - iii, D - ii, E - v

  • A - iii, B - ii, C - iv, D - v, E - i

  • A - ii, B - iii, C - v, D - i, E - iv

Exercises | Q 8. | Page 64

Plants can be grown in ______. (Tick the incorrect option)

  • soil with essential nutrients.

  • water with essential nutrients.

  • either water or soil with essential nutrients.

  • water or soil without essential nutrients.


Exercises | Q 1. | Page 65

Name a plant, which accumulate silicon.

Exercises | Q 2. | Page 65

Mycorrhiza is a mutualistic association. How do the organisms involved in this association benefit from each other?

Exercises | Q 3. | Page 65

Nitrogen fixation is shown by prokaryotes and not by eukaryotes. Comment.

Exercises | Q 4. | Page 65

Carnivorous plants like Nepenthes and Venus fly trap have nutritional adaptations. Which nutrient do they especially obtain and from where?

Exercises | Q 5. | Page 65

Name a plant which lacks chlorophyll. How will it obtain nutrition?

Exercises | Q 6. | Page 65

Name an insectivorous angiosperm.

Exercises | Q 7. | Page 65

A farmer adds Azotobacter culture to soil before sowing maize. Which mineral element is being replenished?

Exercises | Q 8. | Page 65

What is the function of leghaemoglobin in the root nodule of a legume?

Exercises | Q 9. | Page 65

What is common to Nepenthes, Utricularia and Drosera with regard to mode of nutrition?

Exercises | Q 10. | Page 65

Plants with zinc deficiency show reduced biosynthesis of ______.

Exercises | Q 11. | Page 65

Yellowish edges appear in leaves deficient in ______ mineral.

Exercises | Q 12. | Page 65

Name the macronutrient which is a component of all organic compounds but is not obtained from soil.

Exercises | Q 13. | Page 65

Name one non-symbiotic nitrogen fixing prokaryote.

Exercises | Q 14. | Page 65

Rice fields produce an important greenhouse gas. Name it.

Exercises | Q 15. | Page 65

Complete the equation for reductive amination

\[\ce{->[?] + NH^{+}4 + NADPH ->[][?] glutamate + NADP + H2O}\]

Exercises | Q 16. | Page 65

Excess of Mn in soil leads to defeciency of Ca, Mg and Fe. Explain.


Exercises | Q 1. | Page 65

How is sulphur important for plants? Name the aminoacids in which it is present.

Exercises | Q 2. | Page 66

How are organisms like Pseudomonas and Thiobacillus of great significance in nitrogen cycle?

Exercises | Q 3. | Page 66

Carefully observe the following figure

  1. Name the technique shown in the figure and the scientist who demonstrated this technique for the first time.
  2. Name atleast three plants for which this technique can be employed for their commercial production.
  3. What is the significance of aerating tube and feeding funnel in this setup?
Exercises | Q 4. | Page 66

Name the most crucial enzyme found in root nodules for N2 fixation? Does it require a special pink coloured pigment for its functioning? Elaborate.

Exercises | Q 5. | Page 66

How are the terms ‘critical concentration’ and ‘deficient’ different from each other in terms of concentration of an essential element in plants? How will you find the values of ‘critical concentration’ and ‘deficient’ for minerals – Fe and Zn?

Exercises | Q 6. | Page 66

Carnivorous plants exhibit nutritional adaptation. Citing an example explain this fact.

Exercises | Q 7. | Page 66

A farmer adds/ supplies Na, Ca, Mg and Fe regularly to his field and yet he observes that the plants show deficiency of Ca, Mg and Fe. Give a valid reason and suggest a way to help the farmer improve the growth of plants.


Exercises | Q 1. | Page 67

It is observed that deficiency of a particular element showed its symptoms initially in older leaves and then in younger leaves.

  1. Does it indicate that the element is actively mobilized or relatively immobile?
  2. Name two elements which are highly mobile and two which are relatively immobile.
  3. How is the aspect of mobility of elements important to horticulture and agriculture?
Exercises | Q 2. | Page 67

We find that Rhizobium forms nodules on the roots of leguminous plants. Also Frankia another microbe forms nitrogen fixing nodules on the roots of non-leguminous plant Alnus.

  1. Can we artificially induce the property of nitrogen fixation in a plant – leguminous or non-leguminous?
  2. What kind of relationship is observed between mycorrihiza and pine trees?
  3. Is it necessary for a microbe to be in close association with a plant to provide mineral nutrition? Explain with the help of one example.
Exercises | Q 3. | Page 67

What are essential elements for plants? Give the criteria of essentiality? How are minerals classifieds depending upon the amount in which they are needed by the plants?

Exercises | Q 4. | Page 67

With the help of examples describe the classification of essential elements based on the function they perform.

Exercises | Q 5. | Page 67

We know that plants require nutrients. If we supply these in excess, will it be beneficial to the plants? If yes, how/If no, why?

Exercises | Q 6. | Page 67

Trace the events starting from the coming in contact of Rhizobium to a leguminous root till nodule formation. Add a note on importance of leg hemoglobin

Exercises | Q 7. | Page 67

Give the biochemical events occurring in the root nodule of a pulse plant. What is the end product? What is its fate?

Exercises | Q 8. | Page 67

Hydroponics have been shown to be a successful technique for growing of plants. Yet most of the crops are still grown on land. Why?

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Chapter 12: Mineral Nutrition

NCERT solutions for Biology Exemplar class 11 chapter 12 - Mineral Nutrition -

NCERT solutions for Biology Exemplar class 11 chapter 12 - Mineral Nutrition

NCERT solutions for Biology Exemplar class 11 chapter 12 (Mineral Nutrition) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. has the CBSE Biology Exemplar class 11 solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Biology Exemplar class 11 chapter 12 Mineral Nutrition are Macro and Micro Nutrients and Their Role, Deficiency Symptoms of Essential Elements, Toxicity of Micronutrients, Elementary Idea of Hydroponics, Nitrogen Metabolism, Criteria for Essentiality, Nitrogen Cycle, Introduction of Mineral Nutrition, Nitrogen to Ammonia Conversion and Nitrogenase, Mineral Nutrition (Questions), Methods to Study the Mineral Requirements of Plants, Mechanism of Absorption of Elements, Translocation of Solutes, Soil as Reservoir of Essential Elements, Biological Nitrogen Fixation.

Using NCERT Class 11 solutions Mineral Nutrition exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in NCERT Solutions are important questions that can be asked in the final exam. Maximum students of CBSE Class 11 prefer NCERT Textbook Solutions to score more in exam.

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