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Class 10 Class 12
Write a note on hydroponics.

Hydroponics is technique of growing plants in a nutrient solution. It is the soilless production of plants. It was demonstrated by Julius von Sachs in 1860.

Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium.

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.

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.

Which pigment is present in the root nodules of legumes ?

Leghaemoglobin.

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