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Class 10 Class 12
How are the minerals absorbed by the plants?

Absorption of minerals : The minerals are absorbed by the plants in two ways.

1. Passive absorption through the apoplast pathway - The movement of ions generally take place through the ion channels that is the transmembrane protein that function as selective pores. It does not require energy.

2. Active absorption through the symplast pathway - It requires the expenditure of energy. The ions are slowly into  the inner space.

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.

Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium.

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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