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Class 10 Class 12
Why is purification of water and nutrient salts so important in studies involving mineral nutrition using hydroponics?

The purification of water and nutrient salts in hydroponics is very important because of the following reasons:

1. Impure water contains impurities, which will interfere in the growth of plant and make the study for the essntiality difficult.

2. Impurities may be toxic to the plant.

3. Impurities may compete with other minerals.

4. Impurities may inhibit some enzymes.

Therefore, only pure water and nutrients should be taken for hydroponics.

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

What type of condition is created by leghaemoglobin in the root modules of legumes ?

Anaerobic.

Which pigment is present in the root nodules of legumes ?

Leghaemoglobin.

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.

Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium.

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