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Class 10 Class 12
What do you understand by heterotrophic mode of nutrition ?

Heterotrophic nutrition : It is the nutrition in which organisms do not manufacture their own food but take food from external sources such as other living organisms or from dead and decaying matter. For example - animals are heterotrophic

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

Anaerobic.

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

Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium.

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.

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