Mineral Nutrition Class 11 Notes - Chapter 12

Like every other living organism on earth, plants need nutrition to sustain themselves. They can acquire nutrition and water from the soil, air and water. However, not all minerals that are absorbed by the plants are useful. Out of the 118 elements discovered so far, less than 21 are deemed to be useful and essential for the plants.

Essential Elements

Mineral nutrition in plants is required for a variety of functions such as growth, repair and photosynthesis. A deficiency of these essential elements can cause a variety of maladies that can range from chlorosis to necrosis. Elements like boron, calcium, chlorine, copper, iron, magnesium, molybdenum, manganese, nickel, phosphorus, potassium, sulfur and zinc have been documented to have beneficial effects on the growth and sustenance of plants.

Why is Nitrogen Important?

Nitrogen is an important component of chlorophyll, hence it is crucial for the process of photosynthesis. Furthermore, we are aware of the fact that nitrogen makes up roughly 78 per cent of the air’s volume. However, plants cannot directly utilize this nitrogen for metabolic activities. Instead, symbiotic nitrogen-fixing bacteria called Rhizobium commonly found in the soil help convert the nitrogen into a form that is usable by plants. In conclusion, mineral nutrition class 11 tells us that nitrogen is a very crucial ingredient required for photosynthesis.

Important Question on Mineral Nutrition Class 11

  1. What are macronutrients?
  2. Define micronutrients.
  3. Name some elements that are toxic to plants
  4. How does the absorption of minerals take place in plants?
  5. How is nitrogen in the atmosphere utilized by the plants?

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Further Reading

Practise This Question

Assertion: Secondary metabolites are produced in small quantities and their extraction from the plant is difficult and expensive.
Reason: Secondary metabolites can be commercially produced by using tissue culture technique.