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Mineral Nutrition

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
What is Foliar Nutrition ? Describe its advantages.

Foliar Nutrition—In this type of process fertilizers, growth hormones, mineral nutrients and several other chemical substances are directly applied to the plants on their leaves. They are dissolved in water and sprayed on the leaves of plants. Such an application of nutrients is called foliar nutrition.

Advantages of Foliar Nutrition—The foliar nutrition has several advantages—

1. It reaches the desired tissues more quickly as compared to the soil nutrients. 

2. It is more economical means of fertilizing crop plants particularly costly micronutrients.

3. It is a useful method for accelerating growth and development during flowering and fruiting. 

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Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium.
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How is nitrogenase enzyme protected ?

The nitrogenase enzyme is very sensitive to the molecular oxygen. It requires anaerobic conditions to work. The leg-haemoglobin in the nodule acts as an oxygen scavenger just meainting the anaerobic condition needed by the enzyme.
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What is Hidden hunger in the case of plants?

Hidden hunger refers to a situation in which a crop needs more of a given nutrient yet has shown no deficiency symptoms. The nutrient content is above the deficiency symptom zone but still considerably needed for optimum crop production
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What type of condition is created by leghaemoglobin in the root modules of legumes ?

Anaerobic.
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Which pigment is present in the root nodules of legumes ?

Leghaemoglobin.
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