NCERT Solutions for Class 11 Biology Chapter 12

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NCERT Solutions for Class 11 Biology Chapter 12

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Mineral Nutrition: Solutions

11 Biology Chapter 12 Question Answers

NCERT Solutions for Class 11 Biology Chapter 12 Mineral Nutrition
NCERT Solutions for Class 11 Biology Chapter 12 in PDF

11 bio ch. 12

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Important Terms on Mineral Nutrition

  • Autotroph: An organism that sythesize its required nutrients from simple and inorganic substance; Example-plants, blue green algae (cyanobacteria)
  • Heterotroph: An organism that cannot synthesise its own nutrients and depend on others. Example-Bacteria, protists, members of animalia.
  • Biological nitrogen fixation: Conversion of atmospheric nitrogen into organic compounds by living organisms.


A process of conversion of nitrate into nitrous oxide and nitrogen gas (N2).
Leg-hemoglobin: Pinkish pigment found in the root nodules of legumes.

  • Conversion of ammonia (NH3) into nitrite and then to nitrate.
    It acts as oxygen scavenger and protects the nitrogenase enzyme from oxidation.
  • Mineral Nutrition: Plants require mineral elements for their growth and development. The utilization of various absorbed ions by a plant for growth and development is called mineral nutrition of the plant.
  • Hydroponics: Soil-less culture of plants, where roots are immersed in nutrient solution (without soil) is called hydroponics. The result obtained from hydroponics may be used to determine deficiency symptoms of essential elements.

  • The movement of ions is called flux. Influx is inward movement of ions into the cells and efflux is the outward movement of ions.
  • Inhibition of cell division: Deficiency of N, K, S. and Mo.
  • Necrosis: Death of tissues particularly leaf tissue due to deficiency of Ca, Mg, Cu, K.
  • Delayed Flowering: due to deficiency of N, S, Mo.
Criteria for essentiality
  1. The element must be necessary for supporting normal growth and reproduction.
  2. Requirement must be specific and not replaceable by another element.
  3. The element must be directly involved in the metabolism of the plant.

Know More
  • Chlorosis: Yellowing of leaves due to loss of chlorophyll.
  • Active Transport: Absorption occurring at the expense of metabolic energy.
  • Passive Transport: Absorption of minerals with concentration gradient by the process of diffusion without the expense of metabolic energy.