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Mineral Nutrition

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

What are the steps involved in formation of root nodule


Steps of root nodules :
(1) Rhizobium bacteria makes contact with a susceptible root hair and divide near it. 

(2) After successful infection of the root hair causes the root hair curls,

(3) Infected thread carries the bacteria to the inner cortex. The bacteria  modifies into rod-shaped bacteroids and cause inner cortical and pericycle cells to divide. Division and growth of cortical and pericycle cells lead to the nodule formation,

(4) A mature nodule forms with vascular tissues continuous with those of the root.

915 Views

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
510 Views

Which pigment is present in the root nodules of legumes ?

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

Anaerobic.
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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.
684 Views

Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium.
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